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HT7939A Datasheet(PDF) 1 Page - Holtek Semiconductor Inc |
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HT7939A Datasheet(HTML) 1 Page - Holtek Semiconductor Inc |
1 / 12 page Rev. 1.20 1 November 04, 2013 Rev. 1.00 PB November 04, 2013 HT7939A High Current and Performance White LED Driver Feature • Inputvoltagerange:2.6V~5.5V • Highefficiency-upto90% • IntegratedN-chMOSFET • Candriveupto39WLEDsfroma5Vinput • Lowstandbycurrent:0.1mA(typ.) • Built-inOVP,OCP,OTP,UVLOprotection • ENpindimmingfrequencyupto200kHz • 1.2MHzfixedswitchingfrequency • SOT23-6package Applications • Displaybacklighting – Automatic – DVDplayer – Digitalphotoframe – Handheldcomputer General Description TheHT7939Aisahighefficiencyboostconverter fordrivingmultipleWhiteLEDsusingcurrentmode operation.Thedeviceisdesignedtodriveupto39 WhiteLEDsfroma5Vpowersupply.TheWhite LEDcurrentissetupusinganexternalcurrentsetting resistor,whichhasalowfeedbackvoltageof0.2Vto minimiseresistorpowerlossesandthusimproving efficiency. TheHT7939Ahasadimmingfrequencyofupto 200kHz,whichhasexcellentlinearperformance overthisdimmingfrequencyrange.Theovervoltage functionpreventsdevicedamagebyturningoffthe convertershouldtheLEDloadbecomeopencircuit. Thedevicealsoincludesovercurrentprotection,over temperatureprotectionandundervoltageprotection preventingdamagetothedeviceshouldtheoutputbe overloaded. Selection Guide Part No. Package Marking HT7939A SOT23-6 39A-1 (OVP=17.6V) 39A-2 (OVP=32.0V) Note:Bothleadfreeandgreencompounddevicesareavailable. |
Similar Part No. - HT7939A_16 |
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Similar Description - HT7939A_16 |
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