SY50133Z1 Datasheet Text
Application Note: SY50133Z1
Flyback Regulator With Primary Side CV/CC Control For Adapters and Chargers
General Description
SY50133Z1 is a single stage Flyback regulator targeting at Constant Current/Constant Voltage (CC/CV) applications. It integrates a 620V/4.4Ω MOSFET in a pact SO8 package to minimize the size. Both the output current and voltage are sensed on the primary side, eliminating the opto-isolator and the secondary side feedback circuitry, and minimizing the overall system cost.
SY50133Z1 adopts the quasi-resonant operation and the adaptive PWM/PFM control to achieve the highest average efficiency and the best EMI performance. The no-load switching frequency can be as low as 500Hz, minimizing the no-load power loss.
SY50133Z1 has programmable cable pensation to provide a better load regulation for the output voltage at the cable terminals.
SY50133Z1 provides reliable protections including VIN Over Voltage Protection, Short Circuit Protection (SCP), Over Temperature Protection (OTP), Output voltage OVP protection (OVP), VSEN/ISEN pin short protection, VSEN pin upper divider resistor disconnect protection.
Features
- Tight PSR CC/CV Regulation Over Entire Operating Range
- QR-mode Operation for High Efficiency
- PWM/PFM Control for High Average Efficiency
- Fast dynamic load transient respns
- Cable pensation for Better Load Regulation
- Low Start Up Current: 5μA Max
- Minimum Frequency Limitation 500Hz
- No-load Power is Less than 50mW
- Reliable Protections for OVP, SCP, OTP,OCP
- Reliable Protections for Safety Requirement
- Maximum switching frequency limitation125kHz
- Integrated 620V/4.4ΩMOSFET
- pact Package: SO8
Applications
- AC/DC Adapters
- Battery Chargers
Remended Operating Output Power
Products
90~264Vac...