The highly integrated FAN4800A/C and FAN4801/1S/2/2L 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 FAN4801/1S/2/2L have lower operation current that save power consumption in external devices. FAN4800A/C and FAN4801/1S/2/2L have accurate 49.9% maximum duty of PWM that makes the hold-up time longer. Specifically, the brownout protection and PFC soft-start functions are not in ML4800 and FAN4800.

To start evaluating FAN4800A/C, FAN4801/1S/2/2L 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 6MW to 8MW.

2. Change RT/CT pin from the existing values to R_T=6.8KWand CT=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 FAN4801/1S/2/2L 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 FAN4802 is available.

Product	Product status	Eco Status	Pricing*	Package type	Leads	Packing method	Package Drawing	Package Marking Convention**
FAN4802LMY	Full Production	Green	$1.03	SOIC	16	TAPE REEL		Line 1: $Y (Fairchild logo) &Z (Asm. Plant Code) &2 (2-Digit Date Code) &K Line 2: FAN4802L Line 3: MYK
FAN4802LNY	Full Production	Green	$1.03	DIP	16	RAIL		Line 1: $Y (Fairchild logo) &Z (Asm. Plant Code) &4 (4-Digit Date Code) &K Line 2: FAN4802L Line 3: NYK
FAN4802MY	Full Production	Green	$1.03	SOIC	16	TAPE REEL		Line 1: $Y (Fairchild logo) &Z (Asm. Plant Code) &2 (2-Digit Date Code) &K Line 2: FAN4802 Line 3: MYI
FAN4802NY	Full Production	Green	$1.03	DIP	16	RAIL		Line 1: $Y (Fairchild logo) &Z (Asm. Plant Code) &4 (4-Digit Date Code) &K Line 2: FAN4802 Line 3: NYI