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All values which are used in the functional description are typical values. A new fully integrated Standby Power concept is implemented into the IC in order to keep the application design easy.
After entering this mode there is still a full control of the power conversion by the secondary side via the same optocoupler that is used for the normal PWM control. The response on load jumps is optimized. The voltage ripple on Vout is minimized. Vout is further on well controlled in this mode. The usually external connected RC-filter in the feedback line after the optocoupler is integrated in the IC to reduce the external part count.
Furthermore a high voltage Startup Cell is integrated into the IC which is switched off once the Undervoltage Lockout on-threshold of 18V is exceeded. This Startup Cell is part of the integrated Depl. The external startup resistor is no longer necessary as this Startup Cell is connected to the Drain.
Power losses are therefore reduced. This increases the efficiency under light load conditions drastically. The Soft-Start capacitor is also used for providing an adjustable blanking window for high load jumps. During this time window the overload detection is disabled. With this concept no further external components are necessary to adjust the blanking window.
Микросхемы БЛОКОВ ПИТАНИЯ - pdf, аналоги, замены