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UC3844AN from UNITRODE

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4.028ms

UC3844AN

Manufacturer: UNITRODE

HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER

Partnumber Manufacturer Quantity Availability
UC3844AN UNITRODE 1000 In Stock

Description and Introduction

HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER The UC3844AN is a high-performance current-mode PWM controller manufactured by UNITRODE (now part of Texas Instruments). Below are its key specifications, descriptions, and features:

### **Specifications:**  
- **Output Configuration:** Single-ended  
- **Topology:** Flyback, Forward, Boost, Buck  
- **Switching Frequency:** Up to 500 kHz  
- **Duty Cycle:** 0% to 50% (adjustable)  
- **Supply Voltage (VCC):** 8.5V to 30V  
- **Start-Up Current:** <1mA  
- **Operating Current:** 11mA (typical)  
- **Output Current (Peak):** ±1A (sink/source)  
- **Reference Voltage:** 5V (±1% tolerance)  
- **Error Amp Bandwidth:** 1MHz  
- **Current Sense Threshold:** 1V  
- **Operating Temperature Range:** -40°C to +85°C  
- **Package:** 8-Pin DIP (UC3844AN)  

### **Descriptions:**  
The UC3844AN is a fixed-frequency pulse-width modulation (PWM) controller optimized for DC-DC converter applications. It features a trimmed oscillator for precise duty cycle control, a temperature-compensated reference, and high-gain error amplifier. The device includes a current-sensing comparator for cycle-by-cycle current limiting and a totem-pole output stage for driving power MOSFETs.  

### **Features:**  
- **Current-Mode Control:** Improves loop response and simplifies compensation.  
- **Under-Voltage Lockout (UVLO):** Ensures proper start-up and shutdown.  
- **Trimmed Oscillator:** Provides accurate frequency control.  
- **High-Current Totem-Pole Output:** Directly drives MOSFETs.  
- **Cycle-by-Cycle Current Limiting:** Enhances system protection.  
- **Low Start-Up Current:** Reduces power consumption during start-up.  
- **Internal Reference Voltage:** 5V (±1% accuracy).  
- **Soft-Start Capability:** Reduces inrush current.  

The UC3844AN is commonly used in offline and DC-DC power supplies, battery chargers, and SMPS (Switched-Mode Power Supply) applications.  

(Note: For detailed application circuits and further specifications, refer to the official datasheet.)

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