Current Mode PWM Controller The UC2843ADW is a high-performance current-mode PWM controller manufactured by Texas Instruments (TI). Below are its specifications, descriptions, and features:
### **Specifications:**
- **Manufacturer:** Texas Instruments (TI)
- **Part Number:** UC2843ADW
- **Package:** SOIC-16 (DW)
- **Topology:** Current-Mode PWM Controller
- **Input Voltage (VIN):** Up to 30V
- **Output Voltage (VOUT):** Adjustable via external components
- **Switching Frequency:** Up to 500kHz (adjustable)
- **Duty Cycle Range:** 0% to 100%
- **Operating Temperature Range:** -40°C to +85°C
- **Current Sensing:** Peak current-mode control
- **Start-Up Current:** Typically 0.5mA
- **Error Amplifier Bandwidth:** 1MHz (typical)
- **Output Drive Current:** ±1A (peak)
### **Descriptions:**
The UC2843ADW is a fixed-frequency PWM controller designed for DC-DC converter applications. It features current-mode control for improved loop response and line regulation. The device includes an onboard error amplifier, current sensing comparator, and a totem-pole output driver. It is widely used in power supplies, battery chargers, and offline converters.
### **Features:**
- **Current-Mode Operation:** Provides inherent line feedforward and cycle-by-cycle current limiting.
- **Automatic Feedforward Compensation:** Simplifies loop stabilization.
- **Latching PWM:** Ensures single-pulse response per clock cycle.
- **Undervoltage Lockout (UVLO):** Ensures proper start-up and shutdown.
- **Internal Trimmed Bandgap Reference:** Provides stable 5V reference (±1% accuracy).
- **High-Current Totem-Pole Output:** Directly drives power MOSFETs.
- **Low Start-Up and Operating Current:** Enhances efficiency.
- **Programmable Soft-Start:** Reduces inrush current.
- **Synchronization Capability:** Allows external clock synchronization.
This information is based on the manufacturer's datasheet and technical documentation.
