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UC3845D from ST,ST Microelectronics

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UC3845D

Manufacturer: ST

SMPS Controller

Partnumber Manufacturer Quantity Availability
UC3845D ST 63 In Stock

Description and Introduction

SMPS Controller The UC3845D is a high-performance current-mode PWM controller manufactured by STMicroelectronics.  

### **Specifications:**  
- **Input Voltage (VCC):** 8.5V to 30V  
- **Output Current (Gate Drive):** ±1A (peak)  
- **Operating Frequency:** Up to 500kHz  
- **Duty Cycle Range:** 0% to 100% (adjustable)  
- **Reference Voltage:** 5V (±1%)  
- **Current Sense Comparator:** Adjustable threshold with leading-edge blanking  
- **Under-Voltage Lockout (UVLO):** On/Off thresholds at 8.4V/7.6V (typical)  
- **Package:** SOIC-8  

### **Descriptions:**  
The UC3845D is a fixed-frequency pulse-width modulation (PWM) controller optimized for DC-DC converter and offline power supply applications. It features current-mode control for improved loop response and simplified compensation.  

### **Features:**  
- **Current-Mode Operation:** Enhanced transient response and inherent cycle-by-cycle current limiting.  
- **Precision Oscillator:** Adjustable frequency with sync capability.  
- **Error Amplifier:** High-gain bandwidth for tight regulation.  
- **Soft-Start:** Controlled startup to reduce stress on components.  
- **Low Startup Current:** Typically 0.5mA for efficient operation.  
- **Totem-Pole Output:** Directly drives power MOSFETs.  
- **Protections:** Includes undervoltage lockout (UVLO) and cycle-by-cycle current limiting.  

This information is based on STMicroelectronics' official datasheet for the UC3845D.

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