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UC2843B from ON,ON Semiconductor

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UC2843B

Manufacturer: ON

High Performance Current Mode Controller

Partnumber Manufacturer Quantity Availability
UC2843B ON 1792 In Stock

Description and Introduction

High Performance Current Mode Controller The UC2843B is a high-performance current-mode PWM controller manufactured by ON Semiconductor.  

### **Specifications:**  
- **Input Voltage Range:** 8.5V to 30V  
- **Operating Frequency:** Up to 500kHz  
- **Output Current (Source/Sink):** 1A (Peak)  
- **Duty Cycle Range:** 0% to 100%  
- **Reference Voltage:** 5V (±1%)  
- **Error Amplifier Gain Bandwidth:** 1MHz  
- **Low Startup Current:** <1mA  
- **Undervoltage Lockout (UVLO):** 8.4V (on), 7.6V (off)  
- **Package Options:** PDIP-8, SOIC-8  

### **Descriptions:**  
The UC2843B is a fixed-frequency pulse-width modulation (PWM) controller optimized for high-performance DC-DC converters. It features current-mode control for improved loop response and includes built-in protections such as undervoltage lockout (UVLO), cycle-by-cycle current limiting, and a programmable soft-start.  

### **Features:**  
- **Current-Mode Operation** for improved transient response  
- **Automatic Feed-Forward Compensation**  
- **Latching PWM** for cycle-by-cycle current limiting  
- **Internal Trimmed Bandgap Reference** (5V)  
- **High-Current Totem Pole Output** (1A peak)  
- **Soft-Start Control**  
- **Low Operating Current** (typically 11mA)  
- **Wide Temperature Range:** -40°C to +85°C  

This device is commonly used in power supply applications, including flyback, forward, and boost converters.

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