The highly integrated FAN4800AS/CS/01S/02S parts are specially designed for power supplies that consist of boost PFC and PWM. They require very few external components to achieve versatile protections / compensation. They are available in 16-pin DIP and SOP packages.

The PWM can be used in either current or voltage mode. In voltage mode, feed-forward from the PFC output bus can reduce the secondary output ripple.

Compared with older productions, ML4800 and FAN4800, FAN4800AS/CS/01S/02S have lower operation current that saves power consumption in external devices. FAN4800AS/CS/01S/02S have accurate 49.9% maximum duty of PWM that makes the hold-up time longer. Brownout protection and PFC soft-start functions available in this series are not available in ML4800 and FAN4800.

To evaluate FAN4800AS/CS/01S/02S for replacing existing FAN4800 and ML4800 boards, five things must be completed before the fine-tuning procedure:

1. Change R_AC resister from the old value to a higher resister: between 6MW to 8MW.
2. Change RT/CT pin from the existing values to R_T=6.8kW and CT=1000pF to have f_PFC=64kHz and f_PWM=64kHz.
3. The VRMS pin needs to be 1.224V at V_IN=85 V_AC for universal input application from line input from 85V_AC to 270V_AC.
4. At full load, the average V_VEA needs to be ~4.5V and the ripple of V_VEA needs to be less than 400mV.
5. For the Soft-Start pin, the soft-start current has been reduced to half the FAN4800 capacitor.

There are two differences from FAN4800A/C/01/02 to FAN4800AS/CS/01S/02S:

1. Under-voltage protection debounce time is extended to one second.
2. PWM gate clamp voltage is raised to 19V.

   
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   資料錄入：潤(rùn)百年@電源管理IC 
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