The EV1529DR-00A evaluation board is designed to drive 2 strings of up to 4 backlight LEDs to 30mA and a 4-LED flash string to 150mA from a single Lithium-Ion battery. The board is set up to obtain 20mA backlight current, 40mA preview current and 100mA flash current. All the LED currents can be adjusted by resistors RS1, RS2, and RS3 on the evaluation board.
The MP1529 switches at 1.2MHz and allows the use of tiny, low cost capacitors and small inductors. High frequency PWM dimming is made possible through EN1. The MP1529 includes built-in open-LED over-voltage protection, cycle-by-cycle current limit, over-temperature shutdown, input under-voltage control and integrated soft-start.
""• High Efficiency • 2.7V to 4.2V Input Voltage Range • Tiny Capacitors and Inductors Due to 1.2MHz Fixed Frequency Operation • LCD Backlight to 30mA, Flash to 150mA • Independent Backlight, Preview and Flash Current Adjustment • High Frequency PWM Dimming • Surface-Mount Components • Fully Assembled and Tested""