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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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HT7939A датащи(PDF) 1 Page - Holtek Semiconductor Inc |
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HT7939A датащи(HTML) 1 Page - Holtek Semiconductor Inc |
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1 / 13 page  Rev. 1.00 1 April 19, 2012 Rev. 1.00 PB April 19, 2012 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. |
Аналогичный номер детали - HT7939A |
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Аналогичное описание - HT7939A |
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