Linear Current Switching Regulator Controller The UC2845 is a high-performance current-mode PWM controller manufactured by Texas Instruments (TI). Below are its specifications, descriptions, and features based on factual information from Ic-phoenix technical data files:
### **Specifications:**
- **Input Voltage Range (VCC):** 8.4V to 30V
- **Operating Frequency:** Up to 500 kHz
- **Output Drive Current:** ±1A (peak)
- **Duty Cycle Range:** 0% to 100%
- **Reference Voltage (VREF):** 5V (±1% accuracy)
- **Current Sense Comparator Threshold:** 1V
- **Start-Up Current:** <1mA
- **Operating Temperature Range:** -40°C to +85°C
- **Package Options:** 8-Pin PDIP, SOIC
### **Descriptions:**
- The UC2845 is a fixed-frequency pulse-width modulation (PWM) controller optimized for high-performance DC-DC power supplies.
- It operates in current-mode control, providing improved loop response and simplified feedback loop compensation.
- The device includes an internal oscillator, error amplifier, current-sense comparator, and a high-current totem-pole output driver.
- It is designed for offline and DC-DC converter applications, offering precise control and protection features.
### **Features:**
- **Current-Mode Control:** Enhances line and load regulation.
- **Automatic Feed-Forward Compensation:** Improves input voltage rejection.
- **Under-Voltage Lockout (UVLO):** Ensures proper start-up and shutdown.
- **Cycle-by-Cycle Current Limiting:** Protects against overloads.
- **Internal Trimmed Bandgap Reference:** Provides stable 5V reference.
- **Latching PWM for Single Pulse Metering:** Prevents multiple pulses during fault conditions.
- **High-Current Totem-Pole Output:** Directly drives power MOSFETs.
This information is based on TI's official datasheet for the UC2845.
