FAN4800AU

The highly integrated FAN4800AU/CU parts are specially designed for power supplies that consist of boost PFC and PWM. They require very few external components to achieve versatile protections and compensation. They are available in 16-pin DIP and SOP packages.

The PWM can be used in current or Voltage Mode. In Voltage Mode, feed-forward from the PFC output bus can reduce secondary output ripple. To evaluate FAN4800AU/CU for replacing existing FAN4800A/C, FAN4800AS/CS, old version FAN4800 and ML4800 boards, six things must be completed before the fine-tuning procedure:

1.Change R_AC resistor from the old value to a higher resistor value: 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=85V_AC for universal input application with line input from 85V_AC to 270 V_AC.

4.Change ISENSE pin filter from the exiting values to R_Filter=51Ω and C_Filter=0.01µF for higher bandwidth.

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

6.For the SS pin, the soft-start current has been reduced to half 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 FAN4800AU 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
FAN4800AUM	Full Production	Green as of Jul 2011	$0.92	SO 16L NB	16	TAPE REEL		Line 1:$Y (Fairchild logo) &Z (Asm. Plant Code) &2 (2-Digit Date Code) &K Line 2:FAN4800A Line 3:UMW	FIT :  250   Moisture Sensitivity Level (MSL) :  3   Max Reflow Temp :  260
FAN4800AUN	Full Production	Green as of Jul 2011	$0.92	MDIP 16L	16	RAIL		Line 1:$Y (Fairchild logo) &Z (Asm. Plant Code) &4 (4-Digit Date Code) &K Line 2:FAN4800A Line 3:UNW	FIT :  250   Moisture Sensitivity Level (MSL) :  NA   Max Reflow Temp :  999