APS39903 Description
Pin Assignments The APS39903 is a high accuracy and low cost switching mode power supply switcher for battery charger/adapter applications. It is consists of a primary side regulation controller and a high voltage transistor. The controller regulates the output voltage and current in the primary side by piece-wise Pulse Frequency Modulation (p-PFM) in discontinuous conduction mode (DCM).
APS39903 Key Features
- patible to MediaTek Pump ExpressTM Protocol
- Ultra-Low Standby Power Consumption
- Built-in NPN Transistor with 700VCBO
- Valley-turn On to Reduce Switching Loss and Benefit for EMI
- Piece-wise Frequency Reduction to Enhance Conversion Efficiency
- ±5% Constant Voltage Accuracy for 5V Output
- Audio Noise Suppression
- Open Circuit Protection (OCkP)
- Current Sense Resistor Short Protection
- Over Voltage Protection (OVP)