FAN4800CU

The highly integrated FAN4800A/C and FAN4801/02/02L 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, FAN4800A/C and FAN4801/02/02L have lower operation current that save power consumption in external devices. FAN4800A/C and FAN4801/02/2L have accurate 49.9% maximum duty of PWM that makes the hold-up time longer. Brownout protection and PFC soft-start functions are not in ML4800 and FAN4800.

To evaluate FAN4800A/C, FAN4801/02/02L for replacing existing FAN4800 and ML4800 boards, five things must be done before the fine-tuning procedure:

1. Change R_AC resister from the old value to a higher resister: between 6MΩto 8MΩ.

2. Change RT/CT pin from the existing values to R_T=6.8KΩand C_T=1000pF to have f_PFC=64KHz, f_PWM=64KHz.

3. VRMS pin needs to be 1.224V at V_IN=85 V_AC for universal input application from line input from 85V_AC to 270 V_AC. Both poles for the V_rms of FAN4801/02/02L don’t need to substantially slower than FAN4800; about 5 to 10 times.

4. At full load, the average V_EA needs to ~4.5V and the ripple on the V_EA needs to be less than 400mV.

5. Soft-Start pin, the soft-start current has been reduced to half from the FAN4800 capacitor.

• 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 FAN4800CU 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
FAN4800CUM	Full Production	Green as of Sep 2011	$1.09	SO 16L NB	16	TAPE REEL		Line 1:$Y (Fairchild logo) &Z (Asm. Plant Code) &2 (2-Digit Date Code) &K Line 2:FAN4800C Line 3:UMX	FIT :  250   Moisture Sensitivity Level (MSL) :  3   Max Reflow Temp :  260
FAN4800CUN	Full Production	Green as of Sep 2011	$1.09	MDIP 16L	16	RAIL		Line 1:$Y (Fairchild logo) &Z (Asm. Plant Code) &4 (4-Digit Date Code) &K Line 2:FAN4800C Line 3:UNX	FIT :  250   Moisture Sensitivity Level (MSL) :  NA   Max Reflow Temp :  999