ADI LT1509ISW#TRPBF

平均电流100kHz

Overview

The LT1509ISW 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 volt-age-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 the preset voltage. In the event of brief line loss,the PWM will be shut off when the PFC output voltage drops below 73% of the preset value.

Features

Tape & Reel (TR) Package

Surface Mount Mounting Type

Applications

There are a lot of Linear Technology/Analog Devices
LT1509ISW#TRPBF PFC PMICs applications.

• Video equipment
• CPU power supply
• Switching regulator
• Multiple-power supply system
• Digital audio player
• Digital TV
• Smartcard
• Industrial equipment
• DVD and CD-ROM drive
• Quick charge protocols