发布时间:2022-12-16 11:02:43 作者: 赛威科技 来源:

HV Buck Power Switch


   Built-in 800V Power BJT and start resistance

   Direct Drive of Low Cost BJT

   CV Mode Control

   Work at BCM

   Cycle-by-Cycle Current Limiting

   Leading Edge Blanking (LEB)

   Pin Floating Protection

   VDD UVLO,  Clamp



   Emergency lamp

   Home appliance


SF4711 is a high precision, highly integrated BCM HV buck power switch for offline small power converter applications. It has built-in power BJT, which can further lower system cost. 

SF4711 has built-in proprietary NC-Cap/HV buck-ITM control for CV control, which eliminates external compensation or filtering capacitor. It has built-in cable drop compensation function, which can provide excellent CV performance. The IC uses Multi Mode Control to improve efficiency and reliability and to decrease audio noise energy @ light loadings.

SF4711 integrates proprietary “Audio Noise Cancellation” control for audio noise free operation. The IC has built-in “Fast Dynamic Response” control to meet USB Charge requirements. SF4711 also integrates proprietary “Zero-Output Startup” control to achieve startup when output is near zero voltage. The IC has proprietary “Smart Output Short Protection”, which can protect the system with large leakage inductance when output is short circuit.

SF4711 integrates functions and protections of FB Short Protection, Under Voltage Lockout (UVLO), VDD Over Voltage Protection (VDD OVP), Soft Start, Cycle-by-cycle Current Limiting (OCP), Pin Floating Protection, VDD Clamping.

SF4711 is available SOT23-6 packages.

上一个: SFL900B
下一个: ​SF5897