Bias/Primary Side PWM Controller with Ultra Low Start-up Current POWER MANAGEMENT Description The SC4911 is a highly integrated bias/primary side PWM controller designed for off-line or isolated dc-dc converters in telecommunication and data communication applications.
The high degree of integration minimizes the amount of discrete parts needed and leads to substantial cost and space saving converter designs.
The circuitry of the SC4911 includes line voltage UVLO featuring startup current less than 50µA and programcom mable switching frequency.
The device supply is derived from an auxiliary winding on the transformer.
The auxiliary winding could also provide output feedback i...

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