TPS61169 38-V high-current Boost WLED driver

With a 40V rated integrated switch

FET, the TPS61169 is a boost converter that drives LEDs in series. The boost

converter has a 40V, 1.8A internal MOSFET with minimum 1.2A current limit; thus it

can drive single or parallel LED strings for small- to large-size panel

backlighting. The default white LED current is set with the external sensor

resistor, RSET, and the feedback voltage is regulated to 204mV, as shown

in the Simplified Schematic. During the operation, the LED current can

be controlled by using a pulse width modulation (PWM) signal applied to the CTRL

pin, through which the duty cycle determines the feedback reference voltage. The

TPS61169 does not burst the LED current; therefore, it does not generate audible

noises on the output capacitor. For maximum protection, the device features

integrated open LED protection that disables the TPS61169 to prevent the output

voltage from exceeding the absolute maximum voltage ratings of the device during

open LED conditions.

The TPS61169 is available in a

space-saving 5-pin SC70 package.