White LED Power Supply

The STLD20D is a constant switching frequency boost Regulator mainly dedicated to supply up to 4 white LEDs connected in series. A constant LED current is achieved by sensing the LED current through a sensing resistor R (see Figure 3.). LED The device also includes a supply voltage rejection circuit that prevents from any possible flickering effect on the Display that might happen during input supply voltage variation. An integrated Load Disconnect Switch open the LED path to eliminate the current consumption in shutdown mode. The maximum peak inductor current CAN be programmed STLD20D-C8 only). By STMicroelectronics