The TPS6106x is a high-frequency, synchronous boost converter with constant current
output to drive up to 5 white LEDs. For maximum safety, the device features integrated overvoltage
and an advanced short-circuit protection when the output is shorted to ground. The device operates
with 1-MHz fixed switching frequency to allow for the use of small external components and to
simplify possible EMI problems. The device comes with three different overvoltage protection
thresholds (14 V/18 V/23 V) to allow inexpensive and small-output capacitors with lower voltage
ratings. The LED current is initially set with the external sense resistor Rs, and the feedback
voltage is regulated to 500 mV or 250 mV, depending on the ILED pin configuration. Digital
brightness control is implemented by applying a simple digital signal to the ILED pin.
Alternatively, a PWM signal up to 1 kHz can be applied to the enable pin to control the LED
brightness. During shutdown, the output is disconnected from the input to avoid leakage current
through the LEDs.
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