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Optoelectronics/Displays??

TI unrolls high-power WLED driver IC

Posted: 25 Jun 2007 ?? ?Print Version ?Bookmark and Share

Keywords:white LEDs? LED driver? drive electronics? WLED?

Texas Instruments Inc. has rolled out the TPS61050, a device based on an HF synchronous-boost topology with constant-current sink to drive single white LEDs.

The TPS61050 uses an inductive fixed-frequency pulse-width modulation control scheme using small external components, minimizing input ripple current for general lighting applications and reducing total solution size to less than 25mm?.

The TPS61050 (IC) uses a 2MHz switching frequency, which allows the use of small and low-profile 2.2?H inductors. It operates as a regulated current source, as well as a standard voltage-boost regulator. This additional operating mode can be useful to supply other high-power devices or component in the system requiring a supply voltage higher than the battery voltage.

The device's LED current or the desired output voltage can be programmed via an I?C compatible interface. The TPS61050 also simplifies design by integrating four pre-set operation modes. To simplify flash synchronization with the camera module, the device offers a trigger pin for fast LED turn-on time. When the TPS61050 is not in use, it enters into shutdown mode via the I?C-compatible interface, reducing the input current to 0.3?A. During shutdown, the LED pin is high impedance to avoid leakage current through the LED.

The product is now availability at $1.40 each in 1,000-piece quantities.

- Emily Gleason
eeProductCenter




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