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LT1508

Part Number	LT1508
Manufacturer	Linear Technology
Description	Power Factor and PWM Controller(Voltage Mode)
Published	Mar 22, 2005
Detailed Description	LT1508 Power Factor and PWM Controller (Voltage Mode) FEATURES s s s s s s s s s s s s DESCRIPTION The LT ® 1508 is a ...
Datasheet	LT1508 PDF File

Overview

LT1508 Power Factor and PWM Controller (Voltage Mode) FEATURES s s s s s s s s s s s s DESCRIPTION The LT ® 1508 is a complete solution for universal off-line switching power supplies utilizing active power factor correction.
The PFC section is identical to the LT1248 PFC controller except the EN/SYNC pin is removed because PFC and PWM are synchronized internally.
The voltage mode PWM section (LT1509 is the current mode counterpart) contains all the primary side functions to convert the PFC preregulated high voltage output to an isolated low voltage output.
The PWM duty cycle is internally limited to 47% (maximum 50%) to prevent transformer saturation.
PWM soft start begins when the PFC ou...

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