发布时间:2022-12-21 16:11:01 作者: 赛威科技 来源:

High Performance Current Mode PWM Controller


   Proprietary “Zero OCP/OPP Recovery Gap” Control

   Built-in Soft Start Function

   Pins Floating Protection

   Very Low Startup Current

   High Voltage CMOS Process with Excellent ESD Protection

   Frequency Reduction and Burst Mode Control for Energy Saving

   Current Mode Control

   Built-in Frequency Shuffling

   Programmable Switching Frequency

   Built-in Synchronous Slope Compensation

   Cycle-by-Cycle Current Limiting

   Built-in Leading Edge Blanking (LEB)

   Constant Power Limiting

   Built-in Leading Edge Blanking (LEB)

   Constant Power Limiting

   Audio Noise Free Operation

   VDD OVP & Clamp

  VDD Under Voltage Lockout (UVLO)



Offline AC/DC Flyback Converter for

   AC/DC Adaptors

   Open-frame SMPS

   Set-Top Box Power Supplies

   ATX Standby Power


SF1530 is a high performance, low cost, highly integrated current mode PWM controller for offline flyback converter applications.

PWM switching frequency with shuffling is externally programmable, which can reduce conduction EMI emission of a power supply. When the output power demands decrease, the IC automatically decreases switching frequency for high power conversion efficiency. When the current set-point falls below a given value, e.g. the output power demand diminishes, the IC enters into burst mode and provides excellent efficiency without audio noise.

The IC can achieve “Zero OCP/OPP Recovery Gap” using SiFirst’s proprietary control algorithm. Meanwhile, the OCP/OPP variation versus universal line input is compensated.

The IC has built-in synchronized slope compensation to prevent sub-harmonic oscillation at high PWM duty output. The IC also has built-in soft start function to soften the stress on the MOSFET during power on period.

SF1530 integrates functions and protections of Under Voltage Lockout (UVLO), VCC Over Voltage Protection (OVP), Cycle-by-cycle Current Limiting (OCP), Pins Floating Protection, Over Load Protection (OLP), RT Pin Short-to-GND Protection, Gate Clamping, VCC Clamping, Leading Edge Blanking (LEB).

SF1530 is available in SOT23-6, DIP-8 packages.

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