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UC3844N

SMPS Controller

Partnumber Manufacturer Quantity Availability
UC3844N 13689 In Stock

Description and Introduction

SMPS Controller The UC3844N is a high-performance current-mode PWM controller manufactured by Texas Instruments and other semiconductor companies. Below are the factual specifications, descriptions, and features:

### **Specifications:**
- **Topology:** Current-mode PWM controller  
- **Input Voltage Range (Vcc):** 8.5V to 30V (operating), up to 36V (absolute max)  
- **Output Drive Current:** ±1A (peak)  
- **Switching Frequency:** Up to 500 kHz  
- **Duty Cycle Range:** 0% to 100% (adjustable)  
- **Reference Voltage:** 5V (±1% accuracy)  
- **Operating Temperature Range:** -40°C to +85°C  
- **Package:** 8-Pin DIP (Dual Inline Package)  

### **Description:**
The UC3844N is a fixed-frequency pulse-width modulation (PWM) controller designed for DC-DC converter and offline power supply applications. It provides precise control over the output voltage by adjusting the duty cycle based on current feedback. The device includes an oscillator, error amplifier, current sensing comparator, and a totem-pole output driver.

### **Features:**
- **Current-Mode Control:** Provides cycle-by-cycle current limiting for improved transient response.  
- **Under-Voltage Lockout (UVLO):** Ensures proper operation within the specified voltage range.  
- **Adjustable Oscillator Frequency:** Set via external resistor and capacitor.  
- **Soft-Start Capability:** Reduces inrush current during startup.  
- **Error Amplifier:** High-gain op-amp for precise voltage regulation.  
- **Latch-Free Operation:** Allows immediate restart after fault conditions.  
- **Low Startup Current:** Typically 1mA for efficient power-up.  

These details are based on the manufacturer's datasheet and technical documentation.

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