AN-9731 datasheet(4/22 Pages) FAIRCHILD

Part #	AN-9731

Description	LED Application Design Guide Using BCM Power Factor Correction (PFC) Controller for 100W Lighting System

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Manufacturer	FAIRCHILD [Fairchild Semiconductor]

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AN-9731

www.fairchildsemi.com

Rev. 1.0.0 • 3/24/11

4

Figure 7. AC-Off Operation without AC-Absent

Detection Circuit

Figure 8. AC-Off Operation with AC-Absent

Detection Circuit

4. Design Considerations

In this section, a design procedure is presented using the

schematic in Figure 9 as a reference. A 140W PFC

application with universal input range is selected as a

design example. The design specifications are:

Line Voltage Range: 90~265VAC (Universal Input),

50Hz

Nominal Output Voltage and Current: 400V/0.35A

(140W)

Hold-up Time Requirement: Output Voltage Should

Not Drop Below 330V During One Line Cycle

Output Voltage Ripple: Less than 8VPP

Minimum Switching Frequency: Higher than 50kHz

Control Bandwidth: 5~15Hz

VCC Supplied from Auxiliary Power Supply.

Figure 9. Reference Circuit for Design Example of BCM Boost PFC

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