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UC3843AD1 from ST,ST Microelectronics

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UC3843AD1

Manufacturer: ST

High Performance Current Mode Controller

Partnumber Manufacturer Quantity Availability
UC3843AD1 ST 417 In Stock

Description and Introduction

High Performance Current Mode Controller The UC3843AD1 is a high-performance current-mode PWM controller manufactured by STMicroelectronics (ST). Below are the factual specifications, descriptions, and features:

### **Specifications:**  
- **Manufacturer:** STMicroelectronics (ST)  
- **Type:** Current-mode PWM Controller  
- **Topology:** Flyback, Forward, Boost, Buck  
- **Operating Voltage Range:** 8.5V to 30V  
- **Output Current:** ±1A (Peak)  
- **Switching Frequency:** Up to 500kHz  
- **Duty Cycle Range:** 0% to 100%  
- **Reference Voltage:** 5V (±1% accuracy)  
- **Current Sense Input Threshold:** 1V  
- **Low Startup Current:** <1mA  
- **Operating Temperature Range:** -40°C to +85°C  
- **Package:** SOIC-8  

### **Descriptions:**  
The UC3843AD1 is a fixed-frequency PWM controller optimized for DC-DC converter and offline power supply applications. It provides precise duty cycle control with current-mode operation, enhancing loop response and simplifying compensation. The device includes an under-voltage lockout (UVLO) feature with hysteresis, ensuring reliable startup and shutdown.  

### **Features:**  
- **Current-Mode Operation** for improved transient response  
- **Automatic Feed-Forward Compensation**  
- **Latching PWM** for cycle-by-cycle current limiting  
- **Undervoltage Lockout (UVLO)** with hysteresis  
- **High-Current Totem Pole Output** for driving power MOSFETs  
- **Internal Trimmed Bandgap Reference** (5V ±1%)  
- **Low Startup and Operating Current**  
- **Programmable Oscillator** with sync capability  

This information is based on the manufacturer's datasheet for the UC3843AD1.

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