BiCMOS PFC/PWM Combination Controller The UCC38503DW is a power factor correction (PFC) controller manufactured by Texas Instruments (TI). Below are the factual specifications, descriptions, and features from Ic-phoenix technical data files:
### **Specifications:**
- **Manufacturer:** Texas Instruments (TI)
- **Part Number:** UCC38503DW
- **Package:** SOIC-16 (DW)
- **Type:** Average Current Mode PFC Controller
- **Input Voltage Range:** Up to 600V (for PFC applications)
- **Switching Frequency:** Programmable, up to 250kHz
- **Operating Temperature Range:** -40°C to +85°C
- **Supply Voltage (VCC):** 12V to 17.5V (typical)
- **Start-Up Current:** Low (typical 150µA)
- **Peak Gate Drive Current:** ±1.5A (typical)
- **Power Factor Correction:** >0.99 (typical)
- **Total Harmonic Distortion (THD):** <5% (typical)
### **Descriptions:**
The UCC38503DW is an advanced PFC controller designed for high-performance power factor correction in AC/DC power supplies. It operates in average current mode control, ensuring low harmonic distortion and near-unity power factor. It is suitable for boost-type PFC stages in offline power supplies.
### **Features:**
- **Average Current Mode Control:** Ensures low input current distortion.
- **Programmable Oscillator:** Adjustable switching frequency up to 250kHz.
- **Low Start-Up Current:** Reduces power consumption during startup.
- **Overvoltage Protection (OVP):** Protects against output overvoltage conditions.
- **Undervoltage Lockout (UVLO):** Ensures proper operation within supply voltage limits.
- **Soft-Start Function:** Reduces inrush current during startup.
- **Peak Current Limiting:** Protects against excessive current conditions.
- **Zero-Current Detection (ZCD):** Ensures discontinuous conduction mode (DCM) operation when needed.
- **High Noise Immunity:** Robust against switching noise.
This information is strictly based on the manufacturer's datasheet and technical documentation.
