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UC3842BN from MOTOROLA

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5.005ms

UC3842BN

Manufacturer: MOTOROLA

HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER

Partnumber Manufacturer Quantity Availability
UC3842BN MOTOROLA 175 In Stock

Description and Introduction

HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER The UC3842BN is a high-performance current-mode PWM controller manufactured by Motorola (now part of ON Semiconductor). Below are its specifications, descriptions, and features based on factual information from Ic-phoenix technical data files:

### **Specifications:**
- **Manufacturer:** Motorola (now ON Semiconductor)  
- **Type:** Current-Mode PWM Controller  
- **Package:** 8-Pin DIP (Dual In-Line Package)  
- **Operating Voltage Range:** 7.6V to 30V  
- **Output Drive Current:** 1A (Peak)  
- **Switching Frequency:** Up to 500kHz  
- **Duty Cycle Range:** 0% to 100%  
- **Error Amplifier Gain Bandwidth:** 1MHz  
- **Start-Up Current:** <1mA  
- **Operating Temperature Range:** -40°C to +85°C  

### **Descriptions:**
The UC3842BN is a fixed-frequency pulse-width modulation (PWM) controller designed for DC-DC converter and offline power supply applications. It operates in current-mode control, providing improved line and load regulation. The device includes an oscillator, error amplifier, current sensing comparator, and a high-current totem-pole output driver.

### **Features:**
- **Current-Mode Operation:** Provides cycle-by-cycle current limiting.  
- **Undervoltage Lockout (UVLO):** Ensures proper operation with a start-up threshold of 16V (typical) and hysteresis of 6V.  
- **Adjustable Oscillator Frequency:** Set via external resistor and capacitor.  
- **High-Current Totem-Pole Output:** Directly drives power MOSFETs.  
- **Pulse-by-Pulse Current Limiting:** Enhances system reliability.  
- **Low Start-Up and Operating Current:** Improves efficiency.  
- **Internal Reference Voltage:** 5V (±1%) for precision control.  
- **Automatic Feed-Forward Compensation:** Simplifies feedback loop design.  

This information is strictly based on the manufacturer's datasheet and specifications.

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