Current-Mode PWM Controller The UC3844DTR is a high-performance current-mode PWM controller manufactured by UNITRODE (now part of Texas Instruments). Below are its specifications, descriptions, and features based on factual information from Ic-phoenix technical data files:
### **Specifications:**
- **Output Configuration:** Single-ended
- **Topology:** Flyback, Forward, Boost
- **Switching Frequency:** Up to 500 kHz
- **Duty Cycle Max:** 50%
- **Supply Voltage (VCC):** 8.5V to 30V
- **Start-Up Voltage:** 16V (typical)
- **UVLO (Undervoltage Lockout) Thresholds:**
- Turn-on: 16V (typical)
- Turn-off: 10V (typical)
- **Output Current (Source/Sink):** ±1A (peak)
- **Reference Voltage (VREF):** 5V ±1%
- **Operating Temperature Range:** -40°C to +85°C
- **Package:** SOIC-8
### **Descriptions:**
The UC3844DTR is a fixed-frequency pulse-width modulation (PWM) controller optimized for high-performance DC-DC converter applications. It features current-mode control for improved loop response and simplified compensation. The device includes an oscillator, error amplifier, current sensing comparator, and a high-current totem-pole output driver.
### **Features:**
- **Current-Mode Control:** Enhances line and load regulation.
- **Automatic Feed-Forward Compensation:** Simplifies feedback loop design.
- **Latching PWM for Cycle-by-Cycle Current Limiting:** Protects against overcurrent conditions.
- **Undervoltage Lockout (UVLO):** Ensures proper start-up and shutdown.
- **Internal Trimmed Bandgap Reference:** Provides stable 5V reference.
- **High-Current Totem-Pole Output:** Directly drives power MOSFETs.
- **Low Start-Up and Operating Current:** Improves efficiency.
- **SOIC-8 Package:** Compact and suitable for surface-mount applications.
This information is strictly based on the manufacturer's datasheet and technical documentation.
