HIGH PERFORMANCE CURRENT MODE CONTROLLERS The UC2844D is a current-mode PWM controller manufactured by STMicroelectronics (ST) and Texas Instruments (TI).
### **Key Specifications:**
- **Topology:** Current-mode PWM controller
- **Input Voltage (VCC):** 8V to 30V (operating range)
- **Under-Voltage Lockout (UVLO):** 7.9V (turn-on), 7.6V (turn-off)
- **Switching Frequency:** Up to 500 kHz
- **Output Drive Current:** ±1A (peak)
- **Duty Cycle Range:** 0% to 100%
- **Error Amplifier Bandwidth:** 1 MHz
- **Operating Temperature Range:** -40°C to +85°C (industrial)
- **Package:** SOIC-8
### **Descriptions & Features:**
- **Current-Mode Control:** Provides cycle-by-cycle current limiting for improved transient response.
- **Soft-Start Capability:** Reduces inrush current during startup.
- **Internal Trimmed Bandgap Reference:** 5V (±1%) for precision regulation.
- **Latching PWM:** Ensures single-pulse operation per cycle.
- **Programmable Oscillator:** Allows frequency adjustment with external RC components.
- **Low Startup Current:** Typically 0.5 mA for efficient power-up.
- **High-Voltage Startup Circuit:** Simplifies bootstrap power supply design.
- **Protection Features:** Includes undervoltage lockout (UVLO) and overcurrent protection.
The UC2844D is commonly used in switch-mode power supplies (SMPS), DC-DC converters, and offline power applications.
