发布时间:2022-12-21 17:01:56 作者: 赛威科技 来源:

                             Cost Effective, High Power, η-BalanceTM PWM Controller


   800mA Drive Capability, up to 100W Application with Low System Cost

   Proprietary η-BalanceTM Control to Boost Light Load Efficiency

   Proprietary “Audio Noise Free OCP Compensation”

   Proprietary “Zero OCP/OPP Recovery Gap” Control

   Latch Plug-off Protection with External Triggering

   Fixed 65KHz Switching Frequency

   Built-in Soft Start Function

   Pins Floating Protection

   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

   Audio Noise Free Operation

   VDD UVLO, OVP & Clamp



Offline AC/DC Flyback Converter for

   AC/DC Adaptors

   Open-frame SMPS

   Print Power, Scanners, and Motor Drivers


SF1585 is a high performance, cost effective, highly integrated current mode PWM controller for medium to large offline flyback power converter applications.

In SF1585, PWM switching frequency with shuffling is fixed to 65KHz and is trimmed to tight range. When the output power demands decrease, the IC decreases switching frequency based on the proprietaryη-BalanceTM control to boost power conversion efficiency at the light load 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.

SF1585 can achieve “Zero OCP/OPP Recovery Gap” using SiFirst’s proprietary control algorithm. It also has built in proprietary “Audio Noise Free OCP Compensation”, which can achieve constant power limiting and can achieve audio noise operation at heavy loading when line input is around 90VAC.

SF1585 integrates functions and protections of Under Voltage Lockout (UVLO), VCC Over Voltage Protection (OVP), Cycle-by-cycle Current Limiting (OCP), External Programmable Over Temperature Protection (OTP), All Pins Floating Protection, Over Load Protection (OLP), Gate Clamping, VCC Clamping, Leading Edge Blanking (LEB).

In SF1585, the OTP and VDD OVP is Latch Plug-off protection. The other protection functions are auto-recovery mode protection.

SF1585 is available in SOT23-6, DIP-8 packages.

上一个: SF5539H
下一个: SF1565