DC-DC Converters
Products (207)
UC3842BD1013TR - Current Mode PWM Controller | STMicroelectronics
The UC3842BD1013TR is a high-performance current-mode PWM controller from STMicroelectronics, designed for off-line and DC-to-DC converter applications. It operates as a boost or flyback regulator with isolation capability, providing a cost-effective solution for power supply designs. The device is housed in an 8-SOIC package and supports a switching frequency up to 500 kHz, with a peak output current of 1 A. Its input voltage is rated at 15 V, and it operates over a temperature range of 0°C to 70°C. A current-mode PWM controller is a type of switching regulator controller that uses the inductor current as a feedback signal to modulate the duty cycle of the output switch. This architecture provides inherent cycle-by-cycle current limiting, improved transient response, and simplified loop compensation compared to voltage-mode controllers. The UC3842BD1013TR belongs to the UC3842 family, which is widely used in AC-DC adapters, battery chargers, and isolated DC-DC converters. Key features of the UC3842BD1013TR include a trimmed oscillator for precise frequency control, current-mode operation up to 500 kHz, automatic feed-forward compensation, latching PWM for cycle-by-cycle current limiting, and an internally trimmed reference. These features enable stable and reliable operation in demanding power conversion applications. The device also includes under-voltage lockout (UVLO) and a totem-pole output stage capable of sourcing and sinking 1 A peak current to drive power MOSFET gates directly. Technically, the UC3842BD1013TR integrates a 5V reference, an error amplifier, a current-sense comparator, and a PWM latch. The oscillator frequency is set by an external resistor and capacitor, allowing designers to program the switching frequency from 50 kHz to 500 kHz. The current-sense input provides overcurrent protection by comparing the sensed voltage to a 1V threshold. The device's low startup current and low operating current contribute to high efficiency in power supplies. Typical applications include switch-mode power supplies (SMPS) for consumer electronics, industrial power converters, and isolated flyback converters for telecom and networking equipment. The UC3842BD1013TR is particularly suited for designs requiring a simple, reliable current-mode controller with minimal external components. When designing with this controller, ensure proper PCB layout to minimize noise on the current-sense and feedback paths. Use a low-ESR capacitor on the VCC pin and place the timing components close to the IC. Adequate thermal relief on the SOIC package is recommended for high-power applications.
UCC25800-Q1 - Ultra-Low EMI Transformer Driver | Texas Instruments
The Texas Instruments UCC25800-Q1 is an ultra-low EMI transformer driver designed for isolated bias supplies in automotive and industrial applications. It integrates the switching power stage, control, and protection circuits into an 8-pin HVSSOP (DGN) package with an exposed thermal pad. The device operates from a wide input voltage range of 9 V to 34 V and delivers up to 9 W from a 34-V input. It uses an LLC resonant topology, which allows the use of transformers with higher leakage inductance but much smaller parasitic primary-to-secondary capacitance, significantly reducing common-mode EMI. A transformer driver is a power management IC that generates an AC voltage from a DC input to drive an isolation transformer, providing isolated DC outputs for gate drivers, sensors, and other bias supplies. It sits within the power management hierarchy: transformer driver -> isolated bias supply -> power management IC -> semiconductor. The UCC25800-Q1 simplifies isolated bias supply design by integrating the half-bridge power stage, oscillator, and protection features, eliminating the need for external high-side drivers and complex control loops. Key features include programmable switching frequency from 0.1 MHz to 1.2 MHz, enabling optimization for transformer size and EMI. The device offers a dedicated multi-function pin for external disabling and fault code reporting, enhancing system reliability. Its ultra-low EMI performance is achieved through the LLC topology and low interwinding capacitance transformer design, making it ideal for noise-sensitive automotive environments such as electric vehicles (EVs) and hybrid electric vehicles (HEVs). The UCC25800-Q1 integrates a high-efficiency half-bridge driver with adaptive dead-time control, reducing switching losses and improving efficiency. The device includes comprehensive protection features such as overcurrent protection, thermal shutdown, and undervoltage lockout (UVLO). The 8-pin DGN package with thermal pad provides excellent thermal handling, allowing operation at high ambient temperatures up to 125°C. Typical applications include isolated gate driver bias supplies for traction inverters, on-board chargers, DC-DC converters, and battery management systems in automotive. It is also suitable for industrial isolated power supplies, motor drives, and renewable energy systems. The wide input range and programmable frequency make it versatile for various power levels and isolation requirements. When designing with the UCC25800-Q1, ensure proper transformer selection with low interwinding capacitance to maximize EMI benefits. The SYNC pin allows external synchronization, but the external frequency must be set such that half the sync frequency is between 15% and 30% of the nominal frequency to maintain output regulation. Adequate input decoupling and a low-ESR output capacitor are essential for stable operation.
UCC28019ADR - 65kHz CCM PFC Controller | Texas Instruments
The Texas Instruments UCC28019ADR is an 8-pin active Power Factor Correction (PFC) controller using boost topology in Continuous Conduction Mode (CCM). Designed for systems from 100 W to over 2 kW with wide-range universal AC line input, it operates at a fixed 65-kHz frequency with a maximum duty cycle of 98% (typ). Start-up current during undervoltage lockout is below 200 uA, and low-power standby mode is entered by pulling the VSENSE pin below 0.77 V. The DR suffix denotes the 8-pin SOIC (D) package supplied in tape and reel. A PFC controller is a specialized power management IC that shapes the input current of an AC-DC power supply to be sinusoidal and in phase with input voltage, improving power factor and reducing harmonics to meet standards such as IEC 61000-3-2. In a boost PFC, the controller regulates the DC bus voltage while forcing input current to follow input voltage. PFC controllers belong to the broader family of switch-mode power supply control ICs within power management. Key features include the 8-pin solution that reduces external component count, wide-range universal AC input, fixed 65-kHz switching, output over/under voltage protection, open-loop protection, overcurrent protection, and enhanced start-up and transient response. Average current mode control delivers stability and noise immunity, supported by an internal reference, error amplifier, and PWM comparator. UVLO thresholds are 10.5 V on and 9.5 V off, with a maximum Vin of 21 V. Typical applications include desktop computer and server power supplies, telecom rectifiers, industrial power systems, LED lighting drivers, and battery chargers that must meet power quality regulations. The controller supports both sub-150 W and above-750 W application ranges. When designing with the UCC28019ADR, keep gate drive and current-sense paths short and low inductance, place the sense resistor near the IC with a Kelvin connection, and avoid accidental triggering of the 0.77 V VSENSE standby threshold during normal operation.
UCC28019AQDRQ1 - 65kHz CCM PFC Controller, AEC-Q100 | TI
The Texas Instruments UCC28019AQDRQ1 is an AEC-Q100 qualified 8-pin active Power Factor Correction (PFC) controller that uses boost topology operating in Continuous Conduction Mode (CCM) at a fixed 65 kHz switching frequency. It is suitable for systems from 100 W to greater than 2 kW over a wide-range universal AC line input, packaged in an 8-SOIC (D) surface-mount package. A PFC controller is a power management IC that shapes the input current of an AC-DC converter so it follows the sinusoidal line voltage, raising power factor and reducing harmonic distortion to meet IEC harmonic-current requirements. PFC pre-regulators sit between the bridge rectifier and downstream DC-DC stage in the broader power-supply hierarchy. Key features include an 8-pin solution that senses neither line voltage nor line frequency, reducing external component count; a maximum duty cycle of 97%; and start-up current below 200 uA during undervoltage lockout, minimizing startup loss. Low-power standby mode is controlled by pulling the VSENSE pin below 0.77 V, enabling efficient no-load and light-load system behavior. Internal protection includes soft start, open-loop detection, and overvoltage protection per the datasheet. Architecturally, the controller implements average-current-mode CCM control with soft, controlled on-times that reduce ripple current stress on the boost inductor and MOSFET compared with transition-mode approaches, making it well matched to higher-power designs where EMI filtering and peak-current stress dominate design cost. Typical applications include automotive onboard chargers and front-end AC-DC power supplies, telecom rectifiers, industrial power supplies in the several-hundred-watt to multi-kilowatt range, and server/storage front ends requiring high power factor over universal AC input. Design consideration: because the part operates in CCM, ensure the boost inductor is sized so inductor current remains continuous above minimum load, and add adequate slope compensation via the ICOMP network per the TI datasheet to avoid subharmonic oscillation.
UCC28730-Q1 - PSR Flyback Controller, 5mW Standby | TI
The Texas Instruments UCC28730-Q1 is an automotive-qualified (AEC-Q100), zero-power standby primary-side regulation (PSR) flyback controller providing constant-voltage (CV) and constant-current (CC) output regulation without an optocoupler. It is supplied in a 7-pin SOIC (D) package and operates over a switching frequency range of 32 Hz to 83 kHz. A flyback controller is a switching power supply controller used in isolated DC-DC converters. It regulates output voltage and current by switching the primary-side MOSFET, transferring energy through a coupled inductor to the secondary. Primary-side regulation (PSR) senses the output via an auxiliary flyback winding, eliminating the optocoupler feedback circuit - reducing component count, improving reliability, and lowering standby power within the power management IC hierarchy. Key features include support for wide input ranges from 40 V to 1000 V DC via appropriate transformer and switch selection, a minimum switching frequency of 30 Hz that enables less than 5 mW no-load standby power, and wake-up signal detection that improves transient response to large load steps. A frequency dithering function reduces EMI for easier conducted-emissions compliance. Technically, the device uses a proprietary algorithm processing information from the primary power switch current-sense signal and an auxiliary flyback winding to precisely control output voltage and current. Integrated protections include overvoltage, overcurrent, and overtemperature shutdown. AEC-Q100 qualification and a -40C to +150C junction operating range ensure reliable operation in harsh automotive environments such as traction inverters and on-board chargers. Typical applications include traction-inverter isolated bias supplies, on-board charger (OBC) auxiliary rails, and industrial isolated auxiliary power. A TI reference design delivers an isolated 15 V output at 0.33 A from 40-250 VDC input and 1 A from 250-550 VDC input. Design tip: ensure tight auxiliary-to-secondary winding coupling for regulation accuracy, and place the current-sense resistor and snubber close to the IC to minimize parasitic inductance and EMI.
UCC28C42DR - 20V 1A Current-Mode PWM Controller | TI
The Texas Instruments UCC28C42DR is a high-performance, low-power current-mode PWM controller designed for DC-DC switching power supply applications. It belongs to the UCCx8C4x BiCMOS family, which offers pin-for-pin compatibility with the industry-standard UCx84xA and UCx84x PWM controller families, allowing direct upgrades in existing designs. The device is supplied in an 8-pin SOIC (D) package for industrial temperature ranges. A current-mode PWM controller is an integrated circuit that regulates switching power supply output voltage by controlling the duty cycle of a power switch based on both the voltage error signal and the inductor current. Compared with voltage-mode controllers, the dual-loop current-mode architecture provides better line and load regulation, inherent cycle-by-cycle overcurrent protection, and simpler loop compensation. Current-mode controllers are the standard choice in AC-DC adapters, flyback converters, and isolated power supplies. Key features include a 20V supply voltage rating, 1A peak gate-drive output current, and a maximum switching frequency of 1000 kHz. The UCC28C42 version provides a 14.5V startup (on) and 9V minimum operating (off) UVLO threshold with 100% duty cycle capability. BiCMOS technology reduces startup and operating current, improving efficiency over bipolar predecessors while supporting faster current-sense and oscillator operation. Internally, the device integrates a precision oscillator (programmable via RT/CT components), an error amplifier, a current-sense comparator, a 5V reference (2% accuracy), and a totem-pole output driver. Cycle-by-cycle current limiting protects the external MOSFET during faults. Typical applications include flyback converters, boost converters, and forward converters in industrial power supplies, telecom auxiliary rails, and AC-DC adapters. Its low quiescent current suits off-line auxiliary supplies where standby efficiency matters. Design tip: keep current-sense and gate-drive traces short to minimize parasitic inductance, place RT/CT timing components close to pin 4, and add at least 0.1uF of bypass capacitance at VCC. Pricing as of 2026-08-29.
UCC28C42QDRQ1 - 1MHz Automotive Current-Mode PWM | Texas Instruments
The Texas Instruments UCC28C42QDRQ1 is an AEC-Q100 qualified, automotive-grade, BiCMOS low-power current-mode PWM controller in an 8-pin SOIC (D) package. It implements a fixed-frequency, peak current-mode flyback control scheme with UVLO options and maximum duty-cycle limits, delivering up to 1 MHz switching frequency from a 9V~18V supply range. A current-mode PWM controller is a switching power-supply control IC that regulates converter output by comparing a cycle-by-cycle current-sense ramp against an error-amplifier output, providing inherent cycle-by-cycle current limiting, good line transient response, and simple loop compensation compared to voltage-mode control. Within the power-management hierarchy, the UCC28C4x-Q1 family sits as an off-line/isolated converter controller feeding external power MOSFETs in flyback and forward topologies. Key features include a maximum switching frequency of 1 MHz (1000 kHz), enabling smaller transformer and magnetics designs; BiCMOS technology for low startup and quiescent current, improving light-load efficiency; and pin-for-pin compatibility with the industry-standard UCx84xA/UCx84x PWM controller family, simplifying upgrades from legacy designs. The controller supports both primary-side regulation with an auxiliary winding and secondary-side regulation using an opto-coupler, giving designers topology flexibility. The BiCMOS process combines fast current-sense and oscillator circuitry with low power consumption, making the device well suited to standby-power-sensitive designs. UVLO thresholds and duty-cycle limit options across the UCC28C4x-Q1 family let designers select the appropriate start/stop window for their bias architecture. Typical applications include automotive AC-DC auxiliary power supplies, isolated flyback converters for infotainment and cluster bias rails, USB charger and ADAPTER power stages, and industrial auxiliary supplies where a robust, proven controller topology is required. The automotive qualification (AEC-Q100) and RoHS compliance target OEM vehicle electronics. Design consideration: verify UVLO thresholds against the selected family member and design the transformer for peak current limit; at 1 MHz keep gate-drive and current-sense loop layout short to preserve cycle-by-cycle accuracy. According to the TI UCC28C42-Q1 datasheet (46 pages), maximum duty cycle and UVLO options vary across UCC28C43/44/45 variants.
UCC33020QWRHBRQ1 - 1W Isolated DC/DC Module | TI Automotive
The Texas Instruments UCC33020QWRHBRQ1 is an automotive-qualified DC/DC power module with integrated transformer technology, designed to deliver 1.0W of isolated output power. It operates from a 3.0V to 5.5V input and provides a regulated 5.0V output with a selectable headroom of 5.5V, supporting up to 200mA of load current. The device achieves a 3kVRMS isolation rating using a proprietary transformer architecture, making it ideal for space-constrained and high-voltage applications where traditional transformers are bulky and expensive. A DC/DC power module is a complete power supply solution that integrates the controller, power switches, and often the transformer or inductor into a single package. This integration simplifies design, reduces board space, and improves reliability compared to discrete solutions. In the hierarchy of power management, a DC/DC module is a type of power converter, which falls under power management ICs, ultimately part of the broader semiconductor category. The UCC33020-Q1 specifically targets isolated power delivery, a critical function in systems requiring galvanic isolation for safety or noise immunity. Key features include 1.0W maximum output power, 3.0V to 5.5V input range, selectable 5.0V or 5.5V output, 0.5% typical load regulation, and 4mV/V typical line regulation. The integrated transformer provides 3kVRMS isolation, eliminating the need for external magnetics. The device is AEC-Q100 qualified for automotive applications, ensuring robust performance across temperature extremes. Its ultra-small package (VQFN-20) and high integration make it suitable for space-limited designs. Technically, the UCC33020-Q1 uses a proprietary transformer architecture that enables high isolation in a compact footprint. The module includes all necessary control circuitry, reducing external component count. The selectable output headroom allows designers to optimize for either lower power loss (5.0V) or higher voltage margin (5.5V). The device also features robust protection mechanisms, including overcurrent and thermal shutdown, ensuring reliable operation in harsh environments. Typical applications include isolated power supplies for IGBT/SiC gate drivers in automotive traction inverters, isolated sensor interfaces, and auxiliary power rails in battery management systems. Its 3kVRMS isolation and 1W output make it ideal for powering high-side gate drivers and isolated communication interfaces. The module's small size and integrated transformer are particularly beneficial in electric vehicle (EV) and hybrid electric vehicle (HEV) powertrains where board space is at a premium. When designing with this device, ensure adequate input and output capacitance to maintain stability and meet transient requirements. The selectable output headroom should be chosen based on the downstream load's voltage tolerance. Also, consider the thermal performance of the VQFN-20 package; while the module is efficient, proper PCB layout with thermal vias is recommended for high ambient temperature operation.
UCC33420 - 1.5W Isolated DC/DC Module 3kVRMS | Texas Instruments
The Texas Instruments UCC33420 is an industrial DC/DC power module with integrated transformer technology, designed to provide 1.5W of isolated output power. It operates from a 4.5V to 5.5V input and regulates a 5.0V output with a selectable headroom of 5.5V, delivered in a miniaturized, low-profile VSON (4.00mm x 5.00mm) package with 1.00mm height and >4.1mm clearance and creepage. An isolated DC/DC converter is a power conversion module that provides galvanic isolation between input and output, preventing DC current flow while transferring power across a safety barrier. It sits within the power management IC hierarchy and is essential in systems requiring safety isolation, ground-loop elimination, or noise isolation, such as industrial automation, medical devices, and automotive electronics. The UCC33420 integrates the transformer and power stage in a single package, reducing board space versus discrete transformer-plus-driver solutions. Key features include a proprietary transformer architecture achieving a 3kVRMS isolation rating with low EMI and excellent load regulation of 0.5% typical and line regulation of 4mV/V typical. Integrated protection features include an enable pin with fault reporting mechanism, short circuit protection, and thermal shutdown, increasing overall system robustness. Technically, the UCC33420 uses integrated transformer technology in a multichip module, which minimizes parasitic inductance, improves EMI performance, and achieves high power density. The selectable 5.0V/5.5V output headroom supports driving isolated gate-driver rails, with 300mA available load current per DigiKey listing (200mA at 5.0V per datasheet feature listing for the 1.0W variant). Typical applications include isolated bias supplies for IGBT and SiC gate drivers, industrial fieldbus transceiver power, isolated sensor interfaces, and automotive isolated rails when using the UCC33420-Q1 variant. Design tip: maintain the >4.1mm clearance and creepage on the PCB layout and place input/output capacitors close to the package pins to preserve low-EMI performance.
UCC34141-Q1 - 1.5W 5kVRMS Isolated DC/DC Module | TI
The Texas Instruments UCC34141-Q1 is an automotive-qualified, fully integrated isolated DC/DC power module designed to provide bias power to SiC and IGBT isolated gate drivers. It integrates a high-density planar transformer and isolated power stage in a single 16-SO-MOD package, delivering up to 1.5W of regulated output power with reinforced isolation rated above 5kVRMS. Input range is 5.5V to 20V with 22V overvoltage lockout (OVLO). An isolated DC/DC converter is a power conversion circuit that produces a regulated output while maintaining galvanic isolation between input and output grounds. Isolation is essential where safety standards or large ground-potential differences demand separation, such as gate-driver bias for high-voltage SiC and IGBT switches. The UCC34141-Q1 belongs to the isolated power module family, which integrates transformer, switching elements, and control into one package, cutting board space and system BOM versus discrete flyback designs. Key features include TIs proprietary integrated planar transformer with IsoShield multichip packaging, wide input range with at least 0.6W typical output for 6V to 7V VIN and at least 0.5W at VIN = 5.5V (TA up to 85C), and regulated dual outputs - typically VDD = 18V and VEE = -5V - sensed through FBVDD and FBVEE feedback pins for precise gate-driver bias. The high power density and low-noise control architecture eliminate bulky external isolation transformers, making the part especially attractive in very-high-voltage applications where isolation-rated transformers are large and expensive. The module is AEC-Q100 qualified and operates from -40C to +125C for harsh automotive and industrial environments. Typical applications include isolated bias supplies for SiC/IGBT gate drivers in automotive traction inverters, on-board chargers, DC fast-charging infrastructure, and industrial motor drives. Design tip: maintain PCB creepage/clearance around the isolation barrier and provide thermal copper area, since the module dissipates power internally. The UCC34141EVM-116 evaluation module supports this part and accepts the pin-to-pin 2W variant UCC35341-Q1 for higher power needs.
UCD3138 - Digital Controller for Isolated Power | Texas Instruments
The Texas Instruments UCD3138 is a highly integrated digital power supply controller designed for isolated power conversion applications. It features three feedback loops and eight DPWM outputs, enabling precise digital control of complex power topologies such as LLC, phase-shifted full-bridge, and active clamp forward converters. The device operates from a 3.3V supply and is available in a 40-pin VQFN (6x6 mm) package, offering a compact solution for high-density power systems. A digital power controller is a specialized microcontroller that implements control algorithms in firmware rather than analog circuitry. It combines high-speed analog-to-digital converters (ADCs), digital pulse-width modulators (DPWMs), and a programmable state machine to regulate output voltage and current with high accuracy. In the power management hierarchy, the UCD3138 sits between the power stage (MOSFETs, transformers) and the system supervisor, providing closed-loop regulation and communication with a host processor. Key features of the UCD3138 include three independent feedback loops with dedicated error ADCs, eight DPWM outputs with 250 ps resolution, and an integrated ARM7TDMI-S processor core running at 31.25 MHz. The device also includes a 12-bit, 2 MSPS ADC for monitoring input/output voltages and currents, as well as PMBus and UART interfaces for telemetry and configuration. These features enable adaptive control, fault management, and efficiency optimization in real time. Technically, the UCD3138 employs a digital control architecture that replaces analog compensators with firmware-implemented PID or 2-pole/2-zero filters. This allows for advanced features such as feed-forward, nonlinear gain, and cycle-by-cycle current limiting. The device supports multiple communication protocols, including PMBus, which simplifies system integration and remote monitoring. Its flexible DPWM configuration supports interleaved and phase-shifted operation, making it suitable for multi-phase and bridge topologies. Typical applications include server and telecom power supplies, AC-DC adapters, and isolated DC-DC converters. The UCD3138 is particularly well-suited for high-efficiency, high-density designs where digital control enables precise regulation and fast transient response. For example, in a 1.5 kW LLC resonant converter, the UCD3138 can manage burst mode and light-load efficiency improvements. When designing with the UCD3138, careful attention must be paid to the analog front-end filtering and DPWM output buffering to minimize noise coupling. The device requires a clean 3.3V supply and proper decoupling on the VDDA and VDD pins. Additionally, firmware development is essential, as the control loop parameters must be tuned for the specific power stage.
VIPER22ADIP - 12W Offline Switching Regulator | STMicroelectronics
The STMicroelectronics VIPER22ADIP is a monolithic offline switching regulator that integrates a 730V avalanche-rugged Power MOSFET and a PWM controller in a single 8-pin DIP package. It delivers up to 12W of output power in a wide-input AC/DC power supply, making it ideal for low-power applications such as battery chargers, standby power supplies, and auxiliary power rails. The device operates from an input voltage range of 85VAC to 265VAC, with a fixed 60kHz switching frequency and a current-mode control architecture that ensures stable operation and fast transient response. An offline switching regulator, also known as a switched-mode power supply (SMPS) controller, is a device that converts AC mains voltage directly to a regulated DC output without the need for a bulky line-frequency transformer. The VIPER22ADIP belongs to the family of integrated power switches, which combine the power transistor and control circuitry on a single die, reducing component count and simplifying PCB layout. This integration is part of the broader category of power management ICs, which are essential for efficient energy conversion in modern electronic systems. Key features of the VIPER22ADIP include a 730V avalanche-rugged Power MOSFET, a 60kHz fixed switching frequency, and a standby power consumption of less than 0.5W at no load. The device also offers overcurrent, overvoltage, and thermal shutdown protection, ensuring reliable operation in harsh environments. The 8-pin DIP package provides excellent thermal performance, with a junction-to-ambient thermal resistance of 80°C/W, allowing for compact designs without external heatsinks at moderate power levels. The VIPER22ADIP uses a current-mode PWM control architecture with a built-in high-voltage startup circuit, which eliminates the need for an external startup resistor and reduces power loss. The device also features a frequency jittering function that spreads the EMI spectrum, simplifying filter design and helping to meet EMC standards. The integrated Power MOSFET has a low on-resistance of 13Ω, minimizing conduction losses and improving overall efficiency. Typical applications include AC/DC adapters for consumer electronics, standby power supplies for TVs and monitors, auxiliary power supplies for industrial equipment, and battery chargers. The wide input voltage range and robust protection features make it suitable for global markets with varying mains voltages. When designing with the VIPER22ADIP, ensure proper transformer design and snubber circuitry to minimize voltage spikes and EMI. The feedback loop should be carefully compensated to maintain stability across the full load range. The device's thermal shutdown protection requires adequate PCB copper area for heat dissipation, especially at higher output power levels.
VIPER26LDTR - 800V 1.5A Off-Line Converter | STMicroelectronics
The STMicroelectronics VIPER26LDTR is a high-voltage off-line switching regulator that integrates a 800V avalanche-rugged Power MOSFET and a PWM controller in a compact SO-8 package. It delivers up to 1.5A peak current and is designed for low-power AC-DC applications such as auxiliary power supplies, smart meters, and home appliances. The device operates from a wide input voltage range of 85VAC to 265VAC, making it suitable for global applications. An off-line converter is a power supply topology that directly converts the AC mains voltage to a regulated DC output without a line-frequency transformer. The VIPER26LDTR belongs to the family of integrated power switches, which combine the power transistor and control circuitry in a single package, reducing component count and simplifying PCB layout. This integration improves reliability and reduces electromagnetic interference (EMI) compared to discrete solutions. Key features include a fixed 60kHz switching frequency, burst-mode operation for low standby power (<50mW at 265VAC), and built-in protection functions such as overcurrent, overvoltage, and thermal shutdown. The device also features a high-voltage startup circuit that eliminates the need for an external startup resistor, further reducing component count. The SO-8 package with exposed pad provides excellent thermal performance, with a thermal resistance of 60°C/W. The VIPER26LDTR uses a current-mode control architecture with a built-in error amplifier, allowing direct feedback from the output via an optocoupler. The high-voltage startup circuit charges the VDD capacitor quickly, enabling fast startup even under heavy load. The device supports both isolated and non-isolated topologies, including flyback, buck, and buck-boost converters. Typical applications include auxiliary power supplies for appliances, smart meters, industrial control systems, and LED lighting. The wide input range and low standby power make it ideal for always-on applications where energy efficiency is critical. The device is also suitable for IoT devices and smart home hubs that require a compact, efficient power supply. When designing with the VIPER26LDTR, ensure proper transformer design for the target output power and maintain adequate creepage distances for high-voltage isolation. The exposed pad should be soldered to a large copper area for heat dissipation. The feedback loop must be compensated to ensure stability across the full load range.
VIPER35HDTR - 800V Off-Line High Voltage Converter | STMicroelectronics
The STMicroelectronics VIPER35HDTR is a high-voltage off-line switching regulator designed for low-power AC-DC power supplies. It integrates a 800V avalanche-rugged Power MOSFET, a PWM controller, and a high-voltage startup circuit in a compact SO-8 package. The device operates from a wide input voltage range of 85VAC to 265VAC, making it suitable for global applications. It delivers up to 8W of output power in non-isolated buck configurations and up to 5W in isolated flyback topologies, depending on the input voltage and thermal conditions. An off-line switching regulator is a power management IC that converts AC mains voltage directly to a regulated DC output without a bulky line-frequency transformer. It integrates the power switch, control logic, and protection circuits into a single package, enabling compact and efficient power supplies. The VIPER35HDTR belongs to the VIPER35 family of off-line converters, which are part of STMicroelectronics' VIPER series of high-voltage converters. These devices are widely used in smart meters, home appliances, and industrial control systems where low standby power and high reliability are critical. Key features of the VIPER35HDTR include a fixed 60 kHz switching frequency, which balances efficiency and EMI filter size. The device offers a burst-mode operation at light load, reducing standby power consumption to less than 50 mW at 265VAC. It includes comprehensive protection features such as overcurrent protection (OCP), overvoltage protection (OVP), thermal shutdown, and a built-in soft-start to reduce stress during startup. The high-voltage startup circuit eliminates the need for an external startup resistor, simplifying the design and reducing component count. The VIPER35HDTR uses a current-mode control architecture, providing good line and load regulation. The integrated 800V Power MOSFET has a low RDS(on) of 11 ohm, minimizing conduction losses. The device is available in an SO-8 package with a thermal resistance of 100 C/W, allowing adequate heat dissipation for power levels up to 8W with proper PCB copper area. The operating junction temperature range is -40C to +150C, ensuring reliable operation in harsh environments. Typical applications include auxiliary power supplies for smart meters, home appliances such as washing machines and refrigerators, industrial control systems, and LED lighting drivers. The wide input voltage range and high efficiency make it ideal for global power supply designs. The device also supports both buck and flyback topologies, providing design flexibility. When designing with the VIPER35HDTR, ensure proper PCB layout with a sufficient copper area for thermal dissipation. The high-voltage pins must be spaced adequately to prevent arcing. The feedback loop should be compensated to ensure stability across the full load range. The burst-mode operation at light load reduces standby power but may introduce audible noise; use a proper snubber circuit to mitigate this.
VIPER37HDTR - 800V Offline High-Voltage Converter | STMicroelectronics
The STMicroelectronics VIPER37HDTR is an offline high-voltage converter that integrates an 800V avalanche-rugged Power MOSFET and a PWM controller in a compact SO-8 package. It delivers up to 20W of output power in wide-input applications (85-265VAC) and up to 30W in European single-range (230VAC) applications. The device operates at a fixed 60kHz switching frequency, enabling compact transformer design and reduced EMI filtering requirements. An offline high-voltage converter, also known as a switched-mode power supply (SMPS) controller, is a power management IC that converts AC mains voltage directly to a regulated DC output without requiring a separate bulky line-frequency transformer. It integrates the power switch (MOSFET) and control logic into a single package, simplifying the design of AC-DC power supplies. This category sits within the broader hierarchy: offline converter -> AC-DC converter -> power management IC -> semiconductor. The VIPER37HDTR belongs to the VIPER37 family, which is part of ST's VIPER series of offline converters known for high-voltage robustness and low standby power. Key features include an 800V avalanche-rugged power section, a 60kHz fixed switching frequency, and a standby power consumption of less than 50mW at no load. The device offers a complete set of protection features: overvoltage protection (OVP), overcurrent protection (OCP), thermal shutdown, and a built-in soft-start. The SO-8 package provides a compact footprint with a thermal resistance of 85°C/W, making it suitable for space-constrained power supplies. The VIPER37HDTR uses a current-mode control architecture with a high-voltage startup circuit, eliminating the need for an external startup resistor. This reduces component count and improves efficiency. The integrated 800V MOSFET ensures reliable operation in harsh mains environments, and the device is designed to meet energy-efficiency standards such as Energy Star and Blue Angel. Typical applications include auxiliary power supplies for home appliances, smart meters, LED lighting drivers, and industrial control systems. The wide input voltage range and low standby power make it ideal for always-on applications where energy efficiency is critical. When designing with this device, ensure proper transformer design to maintain stable operation across the full load range. The feedback loop must be compensated to avoid instability, and the PCB layout should minimize parasitic inductance in the high-current paths.