UC3842BD1013TR - Current Mode PWM Controller | STMicroelectronics
N.º da peça: UC3842BD1013TR ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $1.03 | $1,03 |
| 10 | $0.92 | $9,20 |
| 100 | $0.78 | $78,00 |
| 500 | $0.65 | $325,00 |
| 1.000 | $0.55 | $550,00 |
UC3842BD1013TR Visão geral
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.
Alternativas drop-in para UC3842BD1013TR — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
UC3842D
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
UC3842BD1R2G
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
UC2842BD1
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
UC3843BD1013TR
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
UC3842BD1013TR Classificações máximas e características elétricas
| Função | Current Mode PWM Controller |
| Topologia | Boost, Flyback |
| Tipo de saída | Single |
| Frequência de comutação | 500 kHz (max) |
| Output Current | 1 A (peak) |
| Input Voltage | 15 V (nominal) |
| Temperatura de operação | 0°C to 70°C |
| Encapsulamento | 8-SOIC (0.154", 3.90mm Width) |
| Tipo de montagem | Surface Mount |
| Tensão de referência | 5 V (internal trimmed) |
| Current Sense Threshold | 1 V |
| UVLO | Yes |
| RoHS | Compliant |
| REACH | Compliant |
Configuração de pinos do UC3842BD1013TR
| Pino 1 | COMP — Error amplifier output |
| Pino 2 | VFB — Voltage feedback input |
| Pino 3 | ISENSE — Current sense input |
| Pino 4 | RT/CT — Timing resistor/capacitor |
| Pino 5 | GND — Ground |
| Pino 6 | OUT — Gate drive output |
| Pino 7 | VCC — Supply voltage |
| Pino 8 | VREF — 5V reference output |
Aplicações típicas
UC3842BD1013TR é adequado para 6 aplicaçãos: Switch-Mode Power Supplies (SMPS), Flyback Converters, Boost Converters, AC-DC Adapters, Battery Chargers, Industrial Power Converters.
Switch-Mode Power Supplies (SMPS)
The UC3842BD1013TR is ideal for SMPS designs due to its current-mode control, which provides excellent line and load regulation. Its 500 kHz switching frequency allows for smaller magnetic components, reducing overall size and cost. The device's 1 A peak output current can directly drive power MOSFETs, simplifying the gate drive circuit. In a typical flyback converter, the UC3842BD1013TR regulates the output by modulating the duty cycle based on the primary current sense signal, ensuring stable operation across varying loads. Its built-in UVLO and cycle-by-cycle current limiting enhance reliability, making it a preferred choice for consumer and industrial power supplies.
Recomendado
Flyback Converters
The UC3842BD1013TR is specifically designed for flyback converters, offering isolation capability and current-mode control. Its high switching frequency (up to 500 kHz) enables the use of smaller transformers, reducing the footprint of the power supply. The device's 1 A peak output current can drive the gate of a power MOSFET directly, eliminating the need for a separate driver stage. In a flyback topology, the UC3842BD1013TR regulates the output voltage by sensing the primary current and adjusting the duty cycle, providing excellent transient response and overcurrent protection. This makes it suitable for applications such as AC-DC adapters and battery chargers.
Recomendado
Boost Converters
The UC3842BD1013TR supports boost topology, making it suitable for applications requiring a higher output voltage than the input. Its current-mode control provides fast transient response and stable operation over a wide input voltage range. The device's 500 kHz switching frequency allows for small inductor sizes, which is beneficial in space-constrained designs. The 1 A peak output current can drive the gate of a power MOSFET, enabling efficient power conversion. In a boost converter, the UC3842BD1013TR regulates the output by controlling the duty cycle based on the inductor current, ensuring high efficiency and reliable performance. Typical applications include LED drivers and battery-powered devices.
Recomendado
AC-DC Adapters
The UC3842BD1013TR is widely used in AC-DC adapters for consumer electronics, providing a cost-effective solution for converting mains voltage to a regulated DC output. Its current-mode control ensures stable operation across varying load conditions, while the 500 kHz switching frequency reduces the size of the transformer and output filter. The device's 1 A peak output current can directly drive a power MOSFET, simplifying the gate drive circuit. The built-in UVLO and cycle-by-cycle current limiting protect the adapter from overcurrent and under-voltage conditions, enhancing reliability. The UC3842BD1013TR's wide input voltage range and isolation capability make it ideal for universal input adapters.
Recomendado
Battery Chargers
The UC3842BD1013TR is suitable for battery charger applications, particularly in flyback and boost topologies. Its current-mode control allows precise regulation of charging current and voltage, ensuring safe and efficient charging. The device's 500 kHz switching frequency enables compact charger designs, which is important for portable devices. The 1 A peak output current can drive the gate of a power MOSFET, enabling high-efficiency power conversion. The UC3842BD1013TR's cycle-by-cycle current limiting provides overcurrent protection, preventing damage to the battery and the charger circuit. This makes it a reliable choice for Li-ion and lead-acid battery chargers.
Recomendado
Industrial Power Converters
The UC3842BD1013TR is used in industrial power converters, such as those found in factory automation and process control systems. Its current-mode control provides excellent line and load regulation, ensuring stable output voltage in demanding environments. The device's 500 kHz switching frequency allows for small magnetic components, reducing the overall size of the power supply. The 1 A peak output current can drive power MOSFETs directly, simplifying the design. The UC3842BD1013TR's operating temperature range of 0°C to 70°C is suitable for most industrial applications, though for extended temperature ranges, alternatives like the UC2842BD1 may be considered. Its robust protection features, including UVLO and cycle-by-cycle current limiting, enhance reliability in industrial settings.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para UC3842BD1013TR — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | UC3842D | UC3842BD1R2G | UC2842BD1 |
|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Brand | STMicroelectronics | STMicroelectronics | onsemi | NXP Semiconductors |
| Switching Frequency | 500 kHz | 500 kHz | 500 kHz | 500 kHz |
| Output Current | 1 A | 1 A | 1 A | 1 A |
| Topology | Boost, Flyback | Boost, Buck, Buck-Boost, Flyback, Forward | Boost, Flyback | Boost, Flyback |
| Operating Temperature | 0°C to 70°C | 0°C to 70°C | 0°C to 70°C | -40°C to 85°C (likely) |
| Input Voltage | 15 V | 15 V | 15 V | 15 V |
| RoHS | Compliant | Compliant | Compliant | Compliant |
Principais diferenciais
- Supports boost and flyback topologies (vs UC3842D)
- STMicroelectronics quality and availability (vs UC3842BD1R2G)
- Commercial temperature range (vs UC2842BD1)
Notas de projeto
Place the timing resistor (RT) and capacitor (CT) as close to the RT/CT pin (pin 4) as possible to minimize parasitic capacitance and ensure accurate frequency setting. Keep the current sense trace from the sense resistor to the ISENSE pin (pin 3) short and direct, with a small RC filter (e.g., 100Ω and 1nF) to suppress switching noise. Use a solid ground plane to reduce noise coupling.
The UC3842BD1013TR requires a stable VCC supply (typically 15V) with a bypass capacitor of at least 0.1µF placed close to the VCC pin (pin 7). For high-current applications, use a larger electrolytic capacitor (e.g., 10µF) to handle transient currents. Ensure the VCC voltage stays within the UVLO hysteresis to avoid erratic operation.
The 8-SOIC package has limited thermal dissipation capability. For power levels above 1W, provide adequate copper area on the PCB around the IC to act as a heatsink. Consider using thermal vias to connect to a ground plane. If the ambient temperature exceeds 70°C, consider using a controller with an extended temperature range, such as the UC2842BD1.
Informações de conformidade
RoHS and REACH compliance confirmed from PartGenie listing. AEC-Q100 not applicable for commercial-grade part.
