High Performance Current Mode Controller The UC3843BN is a high-performance current-mode PWM controller manufactured by Texas Instruments. Below are its specifications, descriptions, and features based on factual information:
### **Specifications:**
- **Input Voltage Range:** 8.5V to 30V (start-up), 7.6V to 30V (operating)
- **Output Frequency:** Up to 500 kHz
- **Output Current (Peak):** ±1A (source/sink)
- **Duty Cycle Range:** 0% to 100% (adjustable)
- **Reference Voltage:** 5V (±1% tolerance)
- **Operating Temperature Range:** -40°C to +85°C
- **Package:** 8-Pin PDIP (Plastic Dual In-Line Package)
### **Descriptions:**
- The UC3843BN 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 loop response and simplified feedback compensation.
- Features an under-voltage lockout (UVLO) with hysteresis, ensuring reliable start-up and shutdown.
- Includes a trimmed oscillator for precise frequency control and a high-gain error amplifier for tight regulation.
### **Features:**
- **Current-Mode Control:** Enhances transient response and simplifies loop compensation.
- **Under-Voltage Lockout (UVLO):** Ensures proper operation within specified voltage limits.
- **Trimmed Oscillator:** Provides accurate frequency control with external timing components.
- **High-Current Totem Pole Output:** Directly drives power MOSFETs with up to 1A peak current.
- **Low Start-Up Current:** Typically 0.5mA, reducing power consumption during start-up.
- **Cycle-by-Cycle Current Limiting:** Protects against overloads and short circuits.
- **Automatic Feed-Forward Compensation:** Improves line regulation.
This information is strictly based on the manufacturer's datasheet for the UC3843BN.
