HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER The UC2843BD1 is a high-performance current-mode PWM controller manufactured by STMicroelectronics.
### **Specifications:**
- **Topology:** Current-mode PWM controller
- **Input Voltage (VCC):** 8.4V to 30V (operating range)
- **Under-Voltage Lockout (UVLO):** 8.4V (on), 7.6V (off)
- **Switching Frequency:** Up to 500 kHz
- **Output Drive Current:** ±1A (peak)
- **Duty Cycle Range:** 0% to 100%
- **Error Amplifier Bandwidth:** 1 MHz
- **Reference Voltage:** 5V (±1% accuracy)
- **Operating Temperature Range:** -40°C to +85°C
- **Package:** SO-8
### **Descriptions:**
The UC2843BD1 is designed for offline and DC-DC converter applications, providing precise control with current-mode operation. It includes features like cycle-by-cycle current limiting, soft-start capability, and a trimmed oscillator for accurate frequency control.
### **Features:**
- **Current-Mode Operation:** Improves loop response and simplifies compensation.
- **Automatic Feed-Forward Compensation:** Enhances line regulation.
- **Latching PWM:** Ensures single-pulse response per period.
- **Internal Trimmed Reference:** 5V with ±1% accuracy.
- **High-Current Totem Pole Output:** Suitable for driving power MOSFETs.
- **Undervoltage Lockout (UVLO):** Ensures proper start-up and shutdown.
- **Low Start-Up Current:** Typically 0.5 mA.
This IC is commonly used in power supplies, battery chargers, and DC-DC converters.
