SF1533 Datasheet (SiFirst Technology)

SF1533, PWM Power Switch

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.

When the output power demands decrease, the IC decreases switc

SF1533 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