SA7527
POWER FACTOR CORRECTION CONTROLLER OF CRITICAL DUCTING
DESCRIPTION
The SA7527 provides simple and high performance active power
factor correction. The SA7527 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.
SOP-8-225-1.27
DIP-8-300-2.54
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
* Electronic ballast
* SMPS
Device
SA7527
SA7527S
Package
DIP-8-300-2.54
SOP-8-225-1.27
ORDERING INFORMATION
APPLICATIONS
BLOCK DIAGRAM
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:1.0
2005.07.22
Page 1 of 8
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