POWER FACTOR CONTROLLER
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 |
