FAN4802S

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 6MΩ to 8MΩ. 2. Change RT/CT pin from the existing values to R_T=6.8kΩ 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.

• Fairchild 1,000 piece Budgetary Pricing. *
• If there is no sample button displayed at the top of the page, please contact one of the Fairchild distributors or your local sales office to obtain samples.
• Top mark packaging information for product FAN4802S is available. **

Product	Product Status	Eco Status	*Pricing	Package Type	Leads	Packing Method	Package Drawing	**Package Marking Convention	Qualification Support	RoHS IPC1752	RoHS/REACH/ JIG Certificate of Compliance
FAN4802SMY	Full Production	Green as of Oct 2010	$1.09	SO 16L NB	16	TAPE REEL		Line 1:$Y (Fairchild logo) &Z (Asm. Plant Code) &2 (2-Digit Date Code) &K Line 2:FAN4802 Line 3:SMYU	FIT :  250   ESD (HBM) :  5000  V Moisture Sensitivity Level (MSL) :  3   Show more ... Max Reflow Temp :  260
FAN4802SNY	Full Production	Green as of Oct 2010	$1.09	MDIP 16L	16	RAIL		Line 1:$Y (Fairchild logo) &Z (Asm. Plant Code) &4 (4-Digit Date Code) &K Line 2:FAN4802 Line 3:SNYU	FIT :  250   ESD (HBM) :  5000  V Moisture Sensitivity Level (MSL) :  NA   Show more ... Max Reflow Temp :  999