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HT7939A - High Current and Performance White LED Driver

Description

The HT7939A is a high efficiency boost converter for driving multiple White LEDs using current mode operation.

The device 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 feedback voltage of 0.

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Full PDF Text Transcription

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HT7939A High Current and Performance White LED Driver Feature • Input voltage range: 2.6V~5.5V • High efficiency - up to 90% • Integrated N-ch MOSFET • Can drive up to 39 WLEDs from a 5V input • Low standby current: 0.1mA (typ.) • Built-in OVP, OCP, OTP, UVLO protection • EN pin dimming frequency up to 200kHz • 1.2MHz fixed switching frequency • SOT23-6 package Applications • Display backlighting –– Automatic –– DVD player –– Digital photo frame –– Handheld computer General Description The HT7939A is a high efficiency boost converter for driving multiple White LEDs using current mode operation. The device 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 feedback voltage of 0.
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