FAN7527B BOUNDARY MODE PFC CONTROL IC0 pages

©2003 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev 1.0.2
Features
• Internal start-up timer
• Internal R/C filter eliminates the need for an external
R/C filter
• Very precise adjustable output over voltage protection
• Zero current detector
• One quadrant multiplier
• Trimmed 1.5% internal band gap reference
• Under voltage lockout with 3V of hysteresis
• Totem pole output with high state clamp
• Low start-up and operating current
• 8-Pin DIP or 8-Pin SOP
Applications
• Electronic ballast
• SMPS
Description
The FAN7527B provides simple and high performance
active power factor correction. The FAN7527B is optimized
for electronic ballasts and low power and high density power
supplies which require minimum board size, reduced
external components and low power dissipation. Because the
R/C filter is included in the current sense block, the external
R/C filter is not necessary. Special circuitry has also been
added to prevent no load runaway conditions. Regardless of
the supply voltage, the output drive clamping circuit limits
the overshoot of the power MOSFET gate drive. It greatly
enhances the system reliability.
FAN7527B
Power Factor Correction Controller
8-DIP
8-SOP
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