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KA7525B

Fairchild
Part Number KA7525B
Manufacturer Fairchild
Description Power Factor Correction Controller
Published Apr 25, 2005
Detailed Description www.fairchildsemi.com Power Factor Correction Controller Features • Internal Start-up Timer • Internal Current Sense Bl...
Datasheet PDF File KA7525B PDF File

KA7525B
KA7525B

Overview
www.
fairchildsemi.
com Power Factor Correction Controller Features • Internal Start-up Timer • Internal Current Sense Blanking Which Eliminates the Need for an External R/C filter • Overvoltage Comparator Eliminates Runaway Output Voltage • Zero Current Detector • One Quadrant Multiplier • Trimmed 1.
5% Internal Bandgap Reference • Under Voltage Lock Out with 2.
1V of Hysteresis • Totem Pole Output with High State Clamp • Low Start-up and Operating Current • 8-Pin DIP or 8-Pin SOP.
KA7525B Description The KA7525B provides simple and high performance active power factor correction.
KA7525B is optimized for electronic ballast and low power, high density power supplies requiring a minimum board area, reduced component count and low power dissipation.
Addition of internal current sense blanking (Internal R,C) eliminates the need for an external R/C filter.
Internal clamping of the error amplifier and multiplier outputs improves turn on overshoot characteristics and current limiting.
Special circuitry has also been added to prevent no load runaway conditions.
Output drive clamps limiting power MOSFET gate drive independent of supply voltage greatly enhance the products practical application.
Applications • Electronic Ballast • SMPS 8-DIP 1 8-SOP 1 Rev.
1.
0.
1 ©2002 Fairchild Semiconductor Corporation KA7525B Pin Assignments INV 1 8 Vcc EA OUT 2 7 OUT MULT 3 6 GND CS 4 5 Idet (Top View) Pin Definitions Pin Number 1 2 3 Pin Name INV EA_OUT MULT Pin Function Description Inverting input of the error amplifier.
The output of the Boost converter should be resistively divided to 2.
5V and connected to this pin.
The output of the error amplifier.
A feedback compensation network is placed between this pin and the INV pin.
Input of the multiplier stage.
The full-wave rectified AC is divided to less than 2V and is connected to this pin.
Input of the PWM comparator.
Current is sensed in the Boost stage MOSFET by a resistor in the source lead.
An internal leadin...


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