Current Mode PWMs The UC2842AD is a high-performance current-mode PWM controller manufactured by LMI (Linear Monolithic Inc.). Below are its key specifications, descriptions, and features:
### **Specifications:**
- **Input Voltage Range:** 8V to 30V
- **Operating Frequency:** Up to 500 kHz
- **Output Duty Cycle:** 0% to 100%
- **Maximum Output Current:** ±1A (peak)
- **Reference Voltage:** 5V (±1% accuracy)
- **Start-up Current:** <1mA
- **Undervoltage Lockout (UVLO):** 7.9V (turn-on), 7.5V (turn-off)
- **Operating Temperature Range:** -25°C to +85°C
- **Package:** SOIC-8
### **Descriptions:**
- The UC2842AD is a fixed-frequency PWM controller optimized for DC-DC converter applications.
- It operates in current-mode control for improved loop response and simplified compensation.
- Features include an integrated error amplifier, current sensing comparator, and totem-pole output driver.
- Designed for offline and DC-DC power supplies with high efficiency and reliability.
### **Features:**
- **Current-Mode Control:** Enhances transient response and simplifies feedback loop design.
- **Automatic Feed-Forward Compensation:** Improves line regulation.
- **Programmable Oscillator:** Allows flexible frequency setting via external components.
- **Soft-Start Capability:** Reduces inrush current during startup.
- **Pulse-by-Pulse Current Limiting:** Protects against overloads.
- **Undervoltage Lockout (UVLO):** Ensures proper operation under low input voltage conditions.
- **Totem-Pole Output:** Capable of driving power MOSFETs directly.
This information is based on the manufacturer's datasheet for the UC2842AD.
