RD-310 is a switch power supply reference design from Fairchild Semiconductor Corporation for mobile phone chargers. Its input voltage range is 90~265VAC, output voltage is 5V (0.7A), and rated output power is 3.5W. This design uses the main side regulation PWM control method and has the characteristics of low standby power (less than 30mW), high voltage startup, constant voltage (CV) and constant current (CC) control, frequency hopping to reduce EMI, cable voltage drop compensation, etc.
This document describes the Fairchild RD-310 reference design, a 3.5W Primary-Side-Regulation (PSR) PWM power supply utilizing the FSEZ1317 POWER MOSFET. The design is intended for cell phone charger applications with an input voltage range of 90~265Vac and an output of 5V at 0.7A.
| Input Voltage | 90~265Vac |
|---|---|
| Output Voltage | 5V |
| Rated Output Current | 0.7A |
| Rated Output Power | 3.5W |
| Standby Power | Under 30mW |
| PWM Frequency | 50kHz |
| Primary-Side Inductance | 2.25mH + 5% |
| Primary-Side Leakage Inductance | 80H Maximum |
No, it provides Constant-Voltage (CV) and Constant-Current (CC) control without secondary-feedback circuitry.
The design includes Vpp Over-Voltage Protection (OVP), Vpp Under-Voltage Lockout (UVLO), and Over-Temperature Protection (OTP).