HT7945 datasheet(1/11 Pages) HOLTEK

номер детали	HT7945

подробное описание детали	White LED Backlight Driver

PDF	11 Pages

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производитель	HOLTEK [Holtek Semiconductor Inc]

домашняя страница	http://www.holtek.com

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Rev. 1.00

1

April 13, 2012

Rev. 1.00

PB

April 13, 2012

HT7945

White LED Backlight Driver

Features

• Maxinputvoltage:26V

• IntegratedPowerMosfet

• Outputvoltageupto40Vdriving11series

LEDs–LEDVf(max)=3.5Vperstring–absolute

maxratingupto44V

• ChannelPhaseShiftPWMDimming

• Drivesupto12LEDstringsunderVf(max.)=3.3V

condition

• Lowstringfeedbackvoltage:0.8Vat20mALED

current

• Switchingfrequency:500kHz/1MHz

• 8-stringconstantcurrentoutput

• LEDcurrentadjustablefrom15mAto30mA

• ±1.5%currentmatchingbetweenstrings

• PWMdimmingcontrol

• 1%minimumdimmingduty-cycleat2kHz

• Integratedsoftstartfunction

• LEDfailuredetection:openandshortcircuit

• Capacitortype:ceramic

• Protection:OVP,OTP,UVLO,SWcurrentlimit

• Small24-pinoutlinepackage:4mm×4mm,

thinQFNtype

Applications

• LEDbacklightsfornotebookandtabletPC

General Description

TheHT7945isahighefficiencyDC-DCcontroller

whichcandrivemultipleWLEDsconnectedina

series/parallelconfiguration.Thedevicehasawide

inputvoltage,rangingfrom4.5Vto26V,andan

adjustable15mAto30mAWLEDcurrent,setupusing

anexternalresistor.Intotal,thedevicecansupportup

to88WLED.

Inaddition,eightcurrentsinkregulatorsprovide

±1.5%highprecisioncurrentmatchingbetween

strings.Thebrightnesscanbeadjustedbyanexternal

PWMsignalwithfrequencyupto20kHz.Oncean

open/shortstringisdetected,thatstringisdisabled

whiletheotherstringscontinuetooperatenormally.

Otherprotectionincludessoft-start,undervoltage

lockout, programmable over voltage protection,

switchcurrentlimitandthermalshutdown.

TheHT7945issuppliedinaQFN24pin4x4tiny

footprintpackagetype

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