White LED Driver IC

The TK11851LTL-G is a pulse skipping Step-up DC-DC converter IC designed for White LED Driver applications with the following built in: a very high current switching Transistor (400 mA peak), an inductor current limit detector, a low Voltage Reference (Vref = 0.515 V), a high speed Oscillator an error Comparator a Zener Diode for open-circuit protection and an on/off control. The IC works with a very wide operating supply range (2.3 V to 10 V) and the adjustable output voltage CAN be set as high as 20 V. The device is in the ON state when the En pin is pulled to a high level. Using the very small TK11851LTL-G and a few external components, battery powered systems with LCD Displays such as digital cameras and cellular phones, CAN be effectively backlit with white LEDs The white LEDs are connected in series and driven at a constant current, resulting in uniform brightness and high efficiency. This IC has an adjustable Oscillator which allows the designer to set the operating frequency by an external capacitor with the output controlled by pulse skipping. The reference voltage is a very low 0.515 V, achieving high efficiency operation with the constant current output. A small coil CAN be used because the inductor current limit detector circuit limits the peak current (caused by an input voltage increase or the inrush current at start-up) that flows through the coil. The ON /OFF control is built-in and the circuit current CAN be decreased when the En pin is low (shutdown mode). The white LEDs CAN be dimmed by applying a PWM signal to the En (ON / OFF control) pin. With this method, the white LED brightness is still controlled by constant current, resulting in constant chromaticity. By Toko Inc.
TK11851L 's PackagesTK11851L 's pdf datasheet

TK11851L Pinout, Pinouts
TK11851L pinout,Pin out
This is one package pinout of TK11851L,If you need more pinouts please download TK11851L's pdf datasheet.

TK11851L Application circuits
TK11851L circuits
This is one application circuit of TK11851L,If you need more circuits,please download TK11851L's pdf datasheet.

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