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UC3843NG4 from TEXAS

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UC3843NG4

Manufacturer: TEXAS

Current-Mode PWM Controller 8-PDIP 0 to 70

Partnumber Manufacturer Quantity Availability
UC3843NG4 TEXAS 4 In Stock

Description and Introduction

Current-Mode PWM Controller 8-PDIP 0 to 70 The UC3843NG4 is a high-performance current-mode PWM controller manufactured by Texas Instruments (TEXAS). Below are its specifications, descriptions, and features based on factual information:

### **Specifications:**  
- **Manufacturer:** Texas Instruments  
- **Category:** Integrated Circuits (ICs)  
- **Family:** PMIC - Voltage Regulators - DC DC Switching Controllers  
- **Topology:** Buck, Boost, Flyback, Forward  
- **Control Mode:** Current Mode  
- **Output Type:** Transistor Driver  
- **Number of Outputs:** 1  
- **Switching Frequency:** Up to 500kHz  
- **Duty Cycle (Max):** 100%  
- **Supply Voltage (Vcc):** 8.4V to 30V  
- **UVLO (Undervoltage Lockout):** 8.4V (on), 7.6V (off)  
- **Operating Temperature Range:** -40°C to +85°C  
- **Package / Case:** PDIP-8 (Plastic Dual In-Line Package)  

### **Descriptions:**  
The UC3843NG4 is a fixed-frequency PWM controller designed for DC-DC converter applications. It provides precise control for switching power supplies with features like current sensing, error amplification, and an oscillator for frequency stability. It is widely used in offline and DC-DC power supply designs.  

### **Features:**  
- **Current-Mode Operation:** Improves loop response and simplifies compensation.  
- **Automatic Feed-Forward Compensation:** Enhances line regulation.  
- **Latching PWM for Cycle-by-Cycle Current Limiting:** Protects against overcurrent conditions.  
- **Internal Trimmed Bandgap Reference:** Ensures stable voltage regulation.  
- **High-Current Totem Pole Output:** Directly drives power MOSFETs.  
- **Low Startup Current (0.5mA typical):** Reduces power consumption during startup.  
- **Undervoltage Lockout (UVLO):** Ensures proper operation within voltage limits.  
- **500kHz Oscillator Frequency:** Supports high-frequency switching designs.  

This information is based on the manufacturer's datasheet and technical documentation.

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