With a 40-V rated integrated switch FET, the TPS61165 device is a boost converter that
drives LEDs in series. The boost converter runs at a
1.2-MHz fixed switching frequency with 1.2-A switch current limit, allowing the use of a
high-brightness LED in general lighting.
The default white LED current is set with the external sensor resistor Rset, and the
feedback voltage is regulated to 200 mV, as shown in Typical Application. During the operation, the LED current can be controlled using the
one-wire digital interface (EasyScale protocol) through the CTRL
pin. Alternatively, a pulse-width-modulation (PWM) signal can be applied to the CTRL pin through
which the duty cycle determines the feedback reference voltage. In either digital or PWM mode, the
TPS61165 device 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 TPS61165 device to prevent the output from exceeding its absolute maximum voltage
ratings during open LED conditions.
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