UCC28C42DR - 20V Low-Power Current-Mode PWM Controller | TI
MPN: UCC28C42DR β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.89 | $0.89 |
| 10 | $0.78 | $7.80 |
| 100 | $0.62 | $62.00 |
| 500 | $0.55 | $275.00 |
| 1,000 | $0.48 | $480.00 |
Drop-in alternatives for UCC28C42DR β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
UCC28C42D
β Drop-Inπ Reference alternative (not in catalog)
UCC28C43DR
β Drop-Inπ Reference alternative (not in catalog)
UCC28C44DR
β Drop-Inπ Reference alternative (not in catalog)
UCC28C45DR
β Drop-Inπ Reference alternative (not in catalog)
UC3842AD8
β Drop-Inπ Reference alternative (not in catalog)
UC3842BD1R2G
β Drop-Inπ Reference alternative (not in catalog)
UC3842BNG
β Drop-Inπ Reference alternative (not in catalog)
KA3842A
β Drop-Inπ Reference alternative (not in catalog)
UCC28C42DR Maximum Ratings & Electrical Characteristics
| Topology | Boost, Flyback, Forward |
| Control Method | Current Mode |
| Output Type | Transistor Driver |
| Supply Voltage (VCC) | 20V (max) |
| Startup Voltage (UVLO On) | 14.5V |
| Minimum Operating Voltage (UVLO Off) | 9V |
| UVLO Hysteresis | 8V |
| Maximum Duty Cycle | 100% |
| Switching Frequency | 1000 kHz (max) |
| Output Current (Source/Sink) | 1A peak |
| Reference Voltage | 5V |
| Operating Temperature Range | -40C to +105C |
| Package | 8-SOIC (D) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
UCC28C42DR Pin Configuration
| Pin 1 | COMP β Error amplifier output for loop compensation |
| Pin 2 | VFB β Voltage feedback input |
| Pin 3 | ISENSE β Current sense input |
| Pin 4 | RT/CT β Oscillator timing resistor and capacitor |
| Pin 5 | GND β Ground |
| Pin 6 | OUT β Gate drive output |
| Pin 7 | VCC β Supply voltage |
| Pin 8 | VREF β 5V reference output |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
UCC28C42DR is suitable for 6 applications: Industrial Power Supplies, Telecom Power Supplies, Battery Chargers, LED Lighting Drivers, Auxiliary Power Supplies, AC-DC Adapters.
Industrial Power Supplies
The UCC28C42DR is ideal for industrial power supplies requiring robust current-mode control. Its 20V supply voltage and 1A gate drive can handle a wide input range, while the 100% duty cycle capability ensures operation even under low input voltage conditions. The device's low power consumption improves overall efficiency, making it suitable for always-on industrial equipment. With a switching frequency up to 1 MHz, designers can use smaller transformers and inductors, reducing solution size and cost. The UVLO hysteresis of 8V provides noise immunity, ensuring reliable startup in noisy industrial environments.
Recommended
Telecom Power Supplies
In telecom applications, the UCC28C42DR provides reliable current-mode control for DC-DC converters that power base stations and networking equipment. Its wide input voltage range and 1A gate drive can drive high-voltage MOSFETs in flyback and forward topologies. The device's low quiescent current helps meet standby power regulations, while the 100% duty cycle allows for efficient operation at low input voltages. The 8-SOIC package is compact, saving board space in dense telecom designs. The device's industrial temperature range (-40C to +105C) ensures reliable operation in outdoor and uncontrolled environments.
Recommended
Battery Chargers
The UCC28C42DR is well-suited for battery charger applications, particularly in flyback topologies for AC-DC adapters. Its current-mode control provides accurate current limiting, essential for safe battery charging. The device's 1A gate drive can efficiently switch power MOSFETs, and the 100% duty cycle capability allows for operation even when the input voltage is close to the battery voltage. The low startup current (typical 50uA) reduces power loss in standby mode, extending battery life in portable chargers. The device's wide operating frequency range (up to 1 MHz) enables the use of small magnetic components, making chargers compact and lightweight.
Recommended
LED Lighting Drivers
The UCC28C42DR can be used in LED lighting drivers, particularly in boost or flyback converters for constant-current LED drivers. Its current-mode control allows precise regulation of LED current, ensuring consistent brightness. The device's 1A gate drive can drive MOSFETs in high-power LED drivers, and the 100% duty cycle capability supports wide input voltage ranges, making it suitable for universal AC input (85-265VAC). The low power consumption of the BiCMOS process improves efficiency, reducing heat generation in enclosed lighting fixtures. The device's switching frequency up to 1 MHz allows for small inductors, enabling compact LED driver designs.
Recommended
Auxiliary Power Supplies
The UCC28C42DR is commonly used in auxiliary power supplies for appliances, servers, and industrial equipment. These supplies provide low-power rails (e.g., 5V, 12V) for control circuits, fans, and communication interfaces. The device's low quiescent current and wide input voltage range make it ideal for auxiliary supplies that must operate from a high-voltage DC bus. The 1A gate drive can efficiently switch a small MOSFET, and the 100% duty cycle capability ensures operation even when the input voltage drops. The device's small 8-SOIC package and minimal external components reduce board space and cost, making it a cost-effective solution for auxiliary power.
Recommended
AC-DC Adapters
The UCC28C42DR is widely used in AC-DC adapters for laptops, chargers, and consumer electronics. Its current-mode control provides excellent line and load regulation, essential for meeting energy efficiency standards. The device's 1A gate drive can drive high-voltage MOSFETs in flyback converters, and the 100% duty cycle capability allows for operation at low input voltages (e.g., during brownout conditions). The low startup current reduces standby power consumption, helping adapters meet Energy Star requirements. The device's switching frequency up to 1 MHz enables the use of small transformers, making adapters compact and lightweight. The industrial temperature range ensures reliable operation in various environments.
Recommended
Recommended Products Summary
Engineering reference data for UCC28C42DR β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | UCC28C42D | UCC28C43DR | UC3842AD8 | UC3842BD1R2G |
|---|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | onsemi |
| Supply Voltage (max) | 20V | 20V | 20V | 30V | 30V |
| Startup Threshold (UVLO On) | 14.5V | 14.5V | 8.4V | 16V | 16V |
| Minimum Operating Voltage (UVLO Off) | 9V | 9V | 7.6V | 10V | 10V |
| Maximum Duty Cycle | 100% | 100% | 100% | 100% | 100% |
| Switching Frequency (max) | 1000 kHz | 1000 kHz | 1000 kHz | 500 kHz | 500 kHz |
| Output Current (peak) | 1A | 1A | 1A | 1A | 1A |
Key Differentiators
- Higher switching frequency (1 MHz) vs UC3842A (500 kHz) (vs UC3842AD8)
- Lower startup current (50uA typical) vs UC3842A (1mA) (vs UC3842AD8)
- Wider UVLO hysteresis (8V) vs UC3842A (6V) (vs UC3842AD8)
Design Notes
Place the current sense resistor and filter components close to the ISENSE pin to minimize noise pickup. Use a Kelvin connection for the current sense resistor to avoid voltage drops in the ground trace. Keep the gate drive trace short and wide to reduce inductance and ensure fast switching.
The UCC28C42DR requires a bypass capacitor of at least 0.1uF placed close to the VCC pin to filter high-frequency noise. Additionally, a bulk capacitor (10uF) is recommended to handle transient currents during switching. Ensure the VCC voltage does not exceed the absolute maximum rating of 20V.
Although the UCC28C42DR has low power dissipation, ensure adequate copper area on the PCB for heat dissipation, especially in high-temperature environments. The 8-SOIC package has a thermal resistance of approximately 150C/W (theta_JA). For reliable operation, keep the junction temperature below 125C.
Compliance Information
RoHS compliant per TI product page. Not AEC-Q100 qualified; automotive version UCC28C42-Q1 is available.
