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UC2843N from UNITRODE

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UC2843N

Manufacturer: UNITRODE

CURRENT MODE PWM CONTROLLER

Partnumber Manufacturer Quantity Availability
UC2843N UNITRODE 290 In Stock

Description and Introduction

CURRENT MODE PWM CONTROLLER The UC2843N is a high-performance current-mode PWM controller manufactured by UNITRODE. Below are its key specifications, descriptions, and features:

### **Specifications:**  
- **Input Voltage Range (VCC):** 8V to 30V (operating), 7.9V (start-up threshold), 7.5V (undervoltage lockout)  
- **Output Drive Current:** ±1A (peak)  
- **Switching Frequency:** Up to 500kHz  
- **Duty Cycle Range:** 0% to 100%  
- **Reference Voltage (VREF):** 5V (±1%)  
- **Operating Temperature Range:** -40°C to +85°C  
- **Package:** 8-Pin PDIP (Plastic Dual In-Line Package)  

### **Descriptions:**  
- The UC2843N is a fixed-frequency pulse-width modulation (PWM) controller optimized for DC-DC converter applications.  
- It operates in **current-mode control**, providing improved loop response and simplified feedback compensation.  
- Includes features like **undervoltage lockout (UVLO)**, **soft-start capability**, and **cycle-by-cycle current limiting**.  

### **Features:**  
- **Current-Mode Operation:** Enhances transient response and simplifies loop stabilization.  
- **Automatic Feed-Forward Compensation:** Adjusts for input voltage variations.  
- **Trimmed Oscillator Discharge Current:** Ensures precise duty cycle control.  
- **Under-Voltage Lockout (UVLO):** Ensures proper start-up and shutdown.  
- **High-Current Totem Pole Output:** Directly drives power MOSFETs.  
- **Internal Soft-Start:** Reduces inrush current during start-up.  
- **Pulse-by-Pulse Current Limiting:** Protects against overloads.  

The UC2843N is commonly used in **switched-mode power supplies (SMPS), offline converters, and DC-DC converters**.  

(Note: Always refer to the official datasheet for detailed electrical characteristics and application notes.)

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