The TPS61043DRBT is a high-frequency Boost Converter with constant current output that drives white LEDs or similar. The LED current is set with the external sense resistor (RS) and is directly regulated by the feedback pin (FB) that regulates the voltage across the sense resistor RS to 252mV (typical). To control LED brightness, the LED current can be pulsed by applying a PWM (pulse width modulated) signal with a frequency range of 100Hz to 50kHz to the control pin (CTRL). To allow higher flexibility, the device can be configured so that the brightness is controlled by an analogue signal as well, as described in application information section. To avoid possible leakage currents through the LEDs during shutdown, the control pin (CTRL) disables the device and disconnects the LEDs from ground. The TPS61043 device provides a solution for applications where higher LED currents or more than four LEDs in series must be powered.
Current source with 18V over-voltage protection
Powers up to 4 LEDs in series
Internal 30V switch
Up to 85% efficiency
Precise brightness control using PWM signal or analogue signal
Operates with small-output capacitors down to 100nF
(EN)
