发布时间:2022-12-21 16:16:31 作者: 赛威科技 来源:

                                 Highly Integrated Current Mode PWM Controller  with Latch


   Latch Plug-off Protection with External Triggering

   Built-in Soft Start Function

   Very Low Startup Current

   Frequency Reduction and Burst Mode Control for Energy Saving

   Built-in Frequency Shuffling

   Programmable Switching Frequency

   Built-in Synchronous Slope Compensation

   Cycle-by-Cycle Current Limiting

   Pins Floating Protection

   High Voltage CMOS Process with Excellent ESD Protection

   Current Mode Control

   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 Power Adaptors

   Open-frame SMPS

   Print Power, Scanners, and Motor Drivers


SF1560 is a high performance, highly integrated current mode PWM controller for medium to large offline flyback converter applications.

In SF1560, the PWM switching is internally trimmed to tight range. To improve EMI performance, the IC integrates frequency shuffling function to reduce conduction EMI emission of a power supply. The IC also integrates Constant Power Limiting block to achieve constant output power limit from 90VAC to 264VAC.

Under light load conditions, a green mode function can continuously decrease the switching frequency. Under zero-load conditions, the power supply enters into burst mode and provides excellent efficiency without audio noise generated. This green mode function enables power supplies to meet international power conservation requirements.

SF1560 integrates functions and protections of Under Voltage Lockout (UVLO), VDD Over Voltage Protection (OVP), Soft Start, External Programmable Over Temperature Protection (OTP), Cycle-by-cycle Current Limiting (OCP), Over Load Protection (OLP), Pins Floating Protection, RI Pin Short-to-GND Protection, GATE Clamping, VDD Clamping, Leading Edge Blanking (LEB).

In SF1560, the OTP and VDD OVP is latch plug-off protection. The other protection functions are auto-recovery mode protection.

SF1560 is available in SOP-8 and DIP-8 packages.


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