HIGH PERFORMANCE CURRENT MODE CONTROLLERS The UC3842B is a high-performance current-mode PWM controller manufactured by ON Semiconductor. Below are its specifications, descriptions, and features:
### **Specifications:**
- **Input Voltage (VCC):** 8V to 30V
- **Output Current (Gate Drive):** ±1A (peak)
- **Switching Frequency:** Up to 500 kHz
- **Duty Cycle Range:** 0% to 100%
- **Reference Voltage (VREF):** 5V ±1%
- **Operating Temperature Range:** -40°C to +85°C
- **Package Options:** PDIP-8, SOIC-8
### **Descriptions:**
- The UC3842B is a fixed-frequency pulse-width modulation (PWM) controller optimized for high-performance DC-DC converter applications.
- It operates in current-mode control, providing improved line and load regulation.
- Includes an undervoltage lockout (UVLO) feature to ensure proper startup and shutdown.
- Designed for offline and DC-DC power supplies, battery chargers, and flyback converters.
### **Features:**
- **Current-Mode Operation:** Enhances transient response and simplifies loop compensation.
- **Automatic Feed-Forward Compensation:** Improves line regulation.
- **Undervoltage Lockout (UVLO):** Ensures reliable operation below minimum VCC.
- **Trimmed Oscillator Discharge Current:** Provides precise duty cycle control.
- **High-Current Totem Pole Output:** Directly drives power MOSFETs.
- **Cycle-by-Cycle Current Limiting:** Protects against overloads.
- **Low Startup and Operating Current:** Improves efficiency.
This information is sourced from ON Semiconductor's official documentation.
