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UC3842D from TI,Texas Instruments

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UC3842D

Manufacturer: TI

SMPS Controller

Partnumber Manufacturer Quantity Availability
UC3842D TI 648 In Stock

Description and Introduction

SMPS Controller The UC3842D is a high-performance current-mode PWM controller manufactured by Texas Instruments (TI).  

### **Specifications:**  
- **Input Voltage (VCC):** 16V (typical)  
- **Output Voltage:** Adjustable via external components  
- **Operating Frequency:** Up to 500 kHz  
- **Output Current (Source/Sink):** 1A (peak)  
- **Duty Cycle Range:** 0% to 100%  
- **Error Amplifier Bandwidth:** 1 MHz  
- **Start-Up Current:** <1 mA  
- **Undervoltage Lockout (UVLO):** 16V (on), 10V (off)  
- **Package:** SOIC-8  

### **Descriptions:**  
The UC3842D is a fixed-frequency pulse-width modulation (PWM) controller optimized for DC-DC converter applications. It features current-mode control for improved loop response and includes a trimmed oscillator, temperature-compensated reference, high-gain error amplifier, and a totem-pole output stage.  

### **Features:**  
- **Current-Mode Operation:** Provides cycle-by-cycle current limiting.  
- **Automatic Feed-Forward Compensation:** Simplifies loop stabilization.  
- **Latching PWM:** Ensures single-pulse operation per cycle.  
- **Internal Trimmed Reference:** 5V with ±1% accuracy.  
- **High-Current Totem-Pole Output:** Directly drives power MOSFETs.  
- **Low Start-Up and Operating Current:** Enhances efficiency.  
- **Undervoltage Lockout (UVLO):** Ensures proper start-up and shutdown.  

This device is commonly used in offline and DC-DC power supplies, battery chargers, and flyback converters.

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