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ML4822IP Folha de dados(PDF) 1 Page - Micro Linear Corporation |
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ML4822IP Folha de dados(HTML) 1 Page - Micro Linear Corporation |
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1 / 10 page  1 May 1997 ML4822 * ZVS Average Current PFC Controller GENERAL DESCRIPTION The ML4822 is a PFC controller designed specifically for high power applications. The controller contains all of the functions necessary to implement an average current boost PFC converter, along with a Zero Voltage Switch (ZVS) controller to reduce diode recovery and MOSFET turn-on losses. The average current boost PFC circuit provides high power factor (>98%) and low Total Harmonic Distortion (THD). Built-in safety features include undervoltage lockout, overvoltage protection, peak current limiting, and input voltage brownout protection. The ZVS control section drives an external ZVS MOSFET which, combined with a diode and inductor, soft switches the boost regulator. This technique reduces diode reverse recovery and MOSFET switching losses to reduce EMI and maximize efficiency. *This Part Is End Of Life As Of August 1, 2000 FEATURES s Average current sensing, continuous boost, leading edge PFC for low total harmonic distortion and near unity power factor s Built-in ZVS switch control with fast response for high efficiency at high power levels s Average line voltage compensation with brownout control s Current fed gain modulator improves noise immunity and provides universal input operation s Overvoltage comparator eliminates output “runaway” due to load removal s UVLO, current limit, and soft-start s Precision 1% reference BLOCK DIAGRAM (Pin configuration shown for 14-pin package) Q S R – + 1 14 VEAO VEA 2.5V FB 4 IAC 5 VRMS + – 3 ISENSE 8 GND 2 IEAO + – IEA R+ R– + – – – 6 RTCT OSC GAIN MODULATOR S R Q + – 2.7V FB –1V 12 VCC VCCZ 13.5V ZVS OUT 11 Q S R Q PFC OUT 9 PWR GND 10 OVP I LIMIT REF 13 ZV SENSE 7 + VCCZ REF Q |
Nº de peça semelhante - ML4822IP |
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Descrição semelhante - ML4822IP |
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