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UC3845AN from TI,Texas Instruments

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UC3845AN

Manufacturer: TI

HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER

Partnumber Manufacturer Quantity Availability
UC3845AN TI 2000 In Stock

Description and Introduction

HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER The UC3845AN is a high-performance current-mode PWM controller manufactured by Texas Instruments (TI). Below are its specifications, descriptions, and features:

### **Specifications:**  
- **Input Voltage Range (VCC):** 8V to 30V  
- **Operating Frequency:** Up to 500 kHz  
- **Output Duty Cycle:** 0% to 100%  
- **Output Current (Peak):** 1A (sink/source)  
- **Reference Voltage:** 5V (±1%)  
- **Error Amplifier Gain Bandwidth:** 1 MHz  
- **Current Sense Comparator Threshold:** 1V  
- **Start-Up Current:** <1 mA  
- **Operating Temperature Range:** -40°C to +85°C  
- **Package:** 8-Pin PDIP (Plastic Dual In-Line Package)  

### **Descriptions:**  
The UC3845AN is a fixed-frequency pulse-width modulation (PWM) controller optimized for high-performance DC-DC converters. It operates in current-mode control, providing precise regulation and improved loop response. The device includes an internal trimmed oscillator, error amplifier, current sensing comparator, and a high-current totem-pole output driver.  

### **Features:**  
- **Current-Mode Control:** Enhances loop response and simplifies compensation.  
- **Automatic Feed-Forward Compensation:** Improves line regulation.  
- **Pulse-by-Pulse Current Limiting:** Provides cycle-by-cycle overcurrent protection.  
- **Undervoltage Lockout (UVLO):** Ensures proper start-up and shutdown.  
- **Trimmed Oscillator Discharge Current:** Allows precise duty cycle control.  
- **High-Current Totem-Pole Output:** Directly drives power MOSFETs.  
- **Low Start-Up and Operating Current:** Improves efficiency.  

The UC3845AN is widely used in offline and DC-DC power supplies, battery chargers, and SMPS (Switched-Mode Power Supply) applications.

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