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MC33368 pdf datasheet (High Vo
消耗积分:3 |
格式:rar |
大小:333 |
2008-12-21
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The MC33368 is an active power factor controller that functions as a
boost preconverter in off−line power supply applications. MC33368 is
optimized for low power, high density power supplies requiring a
minimum board area, reduced component count and low power
dissipation. The narrow body SOIC package provides a small
footprint. Integration of the high voltage startup saves approximately
0.7 W of power compared to resistor bootstrapped circuits.
The MC33368 features a watchdog timer to initiate output
switching, a one quadrant multiplier to force the line current to follow
the instantaneous line voltage a zero current detector to ensure critical
conduction operation, a transconductance error amplifier, a current
sensing comparator, a 5.0 V reference, an undervoltage lockout
(UVLO) circuit which monitors the VCC supply voltage and a CMOS
driver for driving MOSFETs. The MC33368 also includes a
programmable output switching frequency clamp. Protection features
include an output overvoltage comparator to minimize overshoot, a
restart delay timer and cycle−by−cycle current limiting.
Features
• Lossless Off−Line Startup
• Output Overvoltage Comparator
• Leading Edge Blanking (LEB) for Noise Immunity
• Watchdog Timer to Initiate Switching
• Restart Delay Timer
• Pb−Free Packages are Available*
boost preconverter in off−line power supply applications. MC33368 is
optimized for low power, high density power supplies requiring a
minimum board area, reduced component count and low power
dissipation. The narrow body SOIC package provides a small
footprint. Integration of the high voltage startup saves approximately
0.7 W of power compared to resistor bootstrapped circuits.
The MC33368 features a watchdog timer to initiate output
switching, a one quadrant multiplier to force the line current to follow
the instantaneous line voltage a zero current detector to ensure critical
conduction operation, a transconductance error amplifier, a current
sensing comparator, a 5.0 V reference, an undervoltage lockout
(UVLO) circuit which monitors the VCC supply voltage and a CMOS
driver for driving MOSFETs. The MC33368 also includes a
programmable output switching frequency clamp. Protection features
include an output overvoltage comparator to minimize overshoot, a
restart delay timer and cycle−by−cycle current limiting.
Features
• Lossless Off−Line Startup
• Output Overvoltage Comparator
• Leading Edge Blanking (LEB) for Noise Immunity
• Watchdog Timer to Initiate Switching
• Restart Delay Timer
• Pb−Free Packages are Available*
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