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LT1509

Part Number	LT1509
Manufacturer	Linear Technology
Description	Power Factor and PWM Controller
Published	Mar 22, 2005
Detailed Description	LT1509 Power Factor and PWM Controller FEATURES s s s s s s s s s s s s DESCRIPTION The LT ® 1509 is a complete soluti...
Datasheet	LT1509 PDF File

Overview

LT1509 Power Factor and PWM Controller FEATURES s s s s s s s s s s s s DESCRIPTION The LT ® 1509 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 current mode PWM section (the LT1508 is the voltage-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 PFC output reaches th...

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