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White LED drivers powers two drivers simultaneously

Posted: 24 Apr 2007     Print Version  Bookmark and Share

Keywords:white-LED drivers  dual-display architectures  inductive boost converter 

Sipex introduced white LED drivers featuring an inductive boost converter powering two independent drivers for driving the white LED main panel backlighting and powering the OLED sub-display or additional white LEDs. Suitable for dual-display architectures including clamshell phones, the SP6415 can be configured to automatically turn off the sub-display when the phone is open. This is possible due to the programming of each driver output current by a single external resistor. The enable pin makes PWM dimming possible as well as extends the battery life by putting the device into a 1µA showdown

With an output voltage up to 20V, as many as five LEDs in series can be powered at over 80 per cent efficiency when the SP6415 is powered from a single-cell Li-ion battery or internal 3.3V or 5V rails found in most hand-held equipment. When switching from powering the main display to the sub-display, voltage is adjusted to maximise efficiency and minimise power loss. Additionally, the device offers a full protection scheme against fault conditions including over-voltage, over-current, over-temperature and under-voltage lock-up. The SP6415 is offered in a Pb-free DFN-10, RoHS-compliant package meeting the extended temperature range of -40°C to 85°C.

The devices are available at Rs.61.60 ($1.40) each in 1,000-piece quantities.

- Emily Gleason

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