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SY50133Z1 - Flyback Regulator

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 compact SO8 package to minimize the size.

Key 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 Compensation 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 limi.

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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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 compact 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.