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UC2842J from UNITRODE

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15.625ms

UC2842J

Manufacturer: UNITRODE

Current-Mode PWM Controller

Partnumber Manufacturer Quantity Availability
UC2842J UNITRODE 40 In Stock

Description and Introduction

Current-Mode PWM Controller The UC2842J is a high-performance current-mode PWM controller manufactured by UNITRODE.  

### **Specifications:**  
- **Topology:** Current-mode PWM control  
- **Operating Frequency:** Up to 500 kHz  
- **Output Drive Current:** ±1 A (peak)  
- **Duty Cycle Range:** 0% to 100%  
- **Input Voltage Range:** 8.2V to 30V (start-up), 7.6V to 30V (operating)  
- **Reference Voltage:** 5V (±1%)  
- **Current Sense Comparator Threshold:** 1V  
- **Low Startup Current:** <1mA  
- **Operating Temperature Range:** -40°C to +85°C  
- **Package:** 8-Pin DIP  

### **Descriptions and Features:**  
- **Current-Mode Control:** Provides inherent line feedforward, cycle-by-cycle current limiting, and simplified loop compensation.  
- **Automatic Feedforward Compensation:** Ensures consistent response to input voltage variations.  
- **Pulse-by-Pulse Current Limiting:** Enhances system reliability.  
- **Undervoltage Lockout (UVLO):** Ensures proper startup and shutdown behavior.  
- **Trimmed Oscillator Discharge Current:** Allows precise frequency control.  
- **Soft-Start Capability:** Reduces stress during power-up.  
- **Latching PWM for Overvoltage Protection:** Prevents damage from excessive output voltage.  
- **High-Current Totem Pole Output:** Optimized for driving power MOSFETs.  

The UC2842J is commonly used in switch-mode power supplies (SMPS), DC-DC converters, and offline power applications.

Partnumber Manufacturer Quantity Availability
UC2842J UC 500 In Stock

Description and Introduction

Current-Mode PWM Controller The UC2842J is a high-performance current-mode PWM controller manufactured by Texas Instruments (formerly Unitrode).  

### **Key Specifications:**  
- **Control Method:** Current-mode PWM  
- **Operating Frequency:** Up to 500 kHz  
- **Duty Cycle Range:** 0% to 100%  
- **Input Voltage Range:** 8.4V to 30V (start-up voltage ~16V)  
- **Output Current (Peak):** ±1A  
- **Reference Voltage:** 5V (±1% tolerance)  
- **Error Amplifier Bandwidth:** ~3 MHz  
- **Package:** 8-Pin DIP (PDIP)  

### **Descriptions and Features:**  
- **Precision Voltage Reference:** Internal 5V reference with tight tolerance for stable operation.  
- **Current Sensing:** Cycle-by-cycle current limiting with adjustable threshold.  
- **Soft-Start:** Built-in soft-start functionality for controlled power-up.  
- **Undervoltage Lockout (UVLO):** Ensures proper operation within the specified voltage range.  
- **High-Speed Switching:** Optimized for high-frequency power supply designs.  
- **Low Startup Current:** Typically 0.5mA, reducing power consumption during startup.  
- **Error Amplifier:** High-gain amplifier for feedback loop stability.  
- **Output Stage:** Totem-pole output for driving power MOSFETs efficiently.  

The UC2842J is commonly used in offline and DC-DC converters, battery chargers, and power supply applications.  

Would you like additional details on any specific feature?

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