High Current and Performance White LED Driver
HT7939A High Current and Performance White LED Driver
Feature
• Input voltage range: 2.6V~5.5V • High efficiency - up t...
Description
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 0.2V to minimise resistor power losses and thus improving efficiency.
The HT7939A has a dimming frequency of up to 200kHz, which has excellent linear performance over this d...
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