Power Board - ViewSonic VS11280 Service Manual

4.2 Power Board

Adapter PWM Controller LD7575PS (IC901)
The LD7575 is a current-mode PWM controller with excellent power-saving operation. It features a high-voltage
current source to directly supply the startup current from bulk capacitor and further to provide a lossless startup
circuit.
The intergrated functions such as the leading-edge blanking of the current sensing,internal slope compensation,and
the small package provide the users a high efficiency minimum external componeng counts,and low cost solution for
AC/DC power applicaions.
Furthermore,the embedded over voltage protection,over load protection and the special green-mode control provide
the solution for users to design a high performance power circuir easily. The LD7575 is offered in SOP-8 package.
Typical Applicaion
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