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HT7939 Datasheet(PDF) 1 Page - Holtek Semiconductor Inc |
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HT7939 Datasheet(HTML) 1 Page - Holtek Semiconductor Inc |
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1 / 12 page  HT7939 High Current and Performance White LED Driver Selection Table Part No. Package Marking HT7939 SOT23-6 7939 Rev 1.60 1 June 25, 2016 Features · Input range from 2.6V~5.5V · Built-in Power MOSFET · Can drive up to 39 White LEDs with a 5V input · Low standby current: 0.1mA (typ.) with VEN low · Integrated Over-voltage, Over-temperature and Over-current protection circuits · Under voltage lock-out protection · 1.2MHz fixed switching frequency · High efficiency - up to 90% · 6-pin SOT23-6 package Applications · Display Backlighting - Automatic - DVD player - Digital photo frame - Handheld computer · LED lighting General Description The HT7939 is a high efficiency boost converter for driv- ing White LEDs using current mode operation. The de- vice is designed to drive up to 39 White LEDs from a 5V power supply. The White LED current is setup using an external current setting resistor, which has a low feed- back voltage of 0.2V to minimise power losses in the re- sistor which improves efficiency. The Over-voltage function prevents damage to the IC by turning off the converter when the LED load is open circuit. The device includes over current protection, over tem- perature protection and under voltage protection pre- venting damage to the device when the output is overloaded. |
Similar Part No. - HT7939_16 |
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Similar Description - HT7939_16 |
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