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UC3843T from ST,ST Microelectronics

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15.137ms

UC3843T

Manufacturer: ST

HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER

Partnumber Manufacturer Quantity Availability
UC3843T ST 1020 In Stock

Description and Introduction

HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER The UC3843T is a high-performance current-mode PWM controller manufactured by STMicroelectronics (ST).  

### **Specifications:**  
- **Input Voltage (VCC):** 8.5V to 30V  
- **Output Duty Cycle:** Up to 100%  
- **Operating Frequency:** Up to 500kHz  
- **Output Current (Peak):** ±1A  
- **Reference Voltage:** 5V (±1% tolerance)  
- **Low Startup Current:** <1mA  
- **Undervoltage Lockout (UVLO):** 8.4V (on), 7.6V (off)  
- **Package:** TO-220-8 (Through-Hole)  

### **Descriptions:**  
The UC3843T is a fixed-frequency PWM controller optimized for DC-DC converter applications. It features current-mode control for improved loop response and includes a built-in oscillator, error amplifier, and high-current totem-pole output for driving power MOSFETs.  

### **Features:**  
- **Current-Mode Operation** for simplified feedback loop compensation  
- **Automatic Feed-Forward Compensation** for improved line regulation  
- **Pulse-by-Pulse Current Limiting** for overload protection  
- **Internal Trimmed Bandgap Reference** for stable voltage regulation  
- **Latching PWM** for cycle-by-cycle current limiting  
- **Low Output Resistance (0.5Ω typical)** for efficient MOSFET driving  

This IC is commonly used in switch-mode power supplies (SMPS), battery chargers, and DC-DC converters.

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