HIGH PERFORMANCE CURRENT MODE CONTROLLERS The UC2843AN is a high-performance current-mode PWM controller manufactured by Texas Instruments (formerly Unitrode). Below are its specifications, descriptions, and features:
### **Specifications:**
- **Topology:** Current-mode PWM controller
- **Operating Frequency:** Up to 500 kHz
- **Input Voltage (VCC):** 8.4V to 30V (start-up voltage: 16V typical)
- **Output Drive Current:** ±1A (peak)
- **Duty Cycle Range:** 0% to 100%
- **Reference Voltage:** 5V (±1% tolerance)
- **Operating Temperature Range:** -40°C to +85°C
- **Package:** 8-Pin PDIP (Plastic Dual In-Line Package)
### **Descriptions:**
- The UC2843AN is designed for offline and DC-DC converter applications.
- It provides precise duty cycle control with current-mode operation for improved loop response and simplified compensation.
- Features include an undervoltage lockout (UVLO) with hysteresis, ensuring reliable start-up and shutdown.
- Includes a built-in trimmed oscillator, error amplifier, and current-sensing comparator.
### **Features:**
- **Current-Mode Operation:** Enhances transient response and simplifies loop compensation.
- **Automatic Feed-Forward Compensation:** Improves line regulation.
- **Undervoltage Lockout (UVLO):** Ensures proper operation within specified voltage limits.
- **High-Current Totem Pole Output:** Directly drives power MOSFETs.
- **Pulse-by-Pulse Current Limiting:** Provides cycle-by-cycle protection.
- **Soft-Start Capability:** Reduces stress during start-up.
- **Low Startup and Operating Current:** Efficient power management.
The UC2843AN is commonly used in power supply designs, including flyback, forward, and boost converters.
(Note: Manufacturer is Texas Instruments, not "N/A.")
