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SF1533 - PWM Power Switch

General Description

SF1533 is a high performance, high efficiency, highly integrated current mode PWM power switch for offline flyback converter applications.

In SF1533, PWM switching frequency with shuffling is fixed to 50KHz and is trimmed to tight range.

Key Features

  • Built-in 600V Power MOSFET.
  • Proprietary η-BalanceTM Control to Boost Light Load Efficiency.
  • Proprietary “Zero OCP/OPP Recovery Gap” Control.
  • Fixed 50KHz Switching Frequency.
  • Built-in Soft Start Function.
  • Very Low Startup Current.
  • Frequency Reduction and Burst Mode Control for Energy Saving.
  • Current Mode Control.
  • Built-in Frequency Shuffling.
  • Built-in Synchronous Slope Compensation.
  • Cycle-by-Cycle Current Limiting.
  • Built-in Leading Edge.

📥 Download Datasheet

Datasheet Details

Part number SF1533
Manufacturer SiFirst Technology
File Size 542.78 KB
Description PWM Power Switch
Datasheet download datasheet SF1533 Datasheet

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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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SF1533 η-BalanceTM PWM Power Switch Fixed 50KHz Fsw FEATURES ◆ Built-in 600V Power MOSFET ◆ Proprietary η-BalanceTM Control to Boost Light Load Efficiency ◆ Proprietary “Zero OCP/OPP Recovery Gap” Control ◆ Fixed 50KHz Switching Frequency ◆ Built-in Soft Start Function ◆ Very Low Startup Current ◆ Frequency Reduction and Burst Mode Control for Energy Saving ◆ Current Mode Control ◆ Built-in Frequency Shuffling ◆ Built-in Synchronous Slope Compensation ◆ Cycle-by-Cycle Current Limiting ◆ Built-in Leading Edge Blanking (LEB) ◆ Constant Power Limiting ◆ Pins Floating Protection ◆ Audio Noise Free Operation ◆ VDD OVP & Clamp ◆ VDD Under Voltage Lockout (UVLO) APPLICATIONS Offline AC/DC Flyback Converter for ◆ AC/DC Adaptors ◆ Open-frame SMPS ◆ Set-Top Box Power Supplies ◆ ATX Standby Power