UA7527

DESCRIPTION

The UTC UA7527 is a simple and high performance active power

factor corrective controller for boost PFC application which operates in

the critical conduction mode. The UTC UA7527 is optimized for

electronic ballasts, low power and high density power supplies which

require minimum board area reduced component count and low power

dissipation. Internal R/C filter eliminates the need for an external R/C

filter. Special circuitry has also been added to prevent no load

runaway conditions. The output drive clamping circuit limits the

overshoot of the power MOSFET gate drive despite the supply

voltage. This greatly enhances the system reliability.

FEATURES

* Internal Start-up Timer

* Very Precise Adjustable Output Over Voltage Protection

* Zero Current Detector

* Quadrant Multiplier

* Internal R/C Filter Eliminates the Need for an External R/C Filter

* 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

规格书UA7527