KA7525BD ,Power Factor Correction (PFC) ControllerApplications• Electronic Ballast8-DIP•SMPS18-SOP1Rev.1.0.12002 Fairchild Semiconductor CorporationK ..
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KA7525BD
Power Factor Correction (PFC) 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.
Applications Electronic Ballast
•SMPS
DescriptionThe 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.
