KA7526D

功率因数校正控制器 Power Factor Correction Controller

Descriptions

The KA7526 provides simple and high performance active power factor correction. KA7526 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 R/C filter eliminates the need for an external R/C filter. Internal clamping of the error amplifier and multiplier outputs improves turn on over shoot characteristics and current limiting. Special circuitry has also been added to prevent no load runaway conditions. The output drive clamping circuit limits overshoot of the power MOSFET gate drive Independent of supply voltage, so that it greatly enhance the system reliability.

Features

• Internal Startup Timer

• Internal R/C filter 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 5V of Hysteresis

• Totem Pole Output with High State Clamp

• Low Startup and Operating Current

• 8-Pin DIP or 8-Pin SOP

Applications

• Electronic Ballast

• SMPS