BASIC CIRCUITRY METHOD AND FEATURES

WHITE LED DRIVERS

Designed for driving LEDs in parallel configuration

Low noise

The W-5200-5 use a switched capacitor charge pump to

boost the voltage at IN to a regulated output voltage.

Regulation is achieved by sensing the output voltage

through an internal resistor divider and modulating the

charge pump output current based on the error signal. A

switches. The external flying capacitor is charged from the

voltage and connected to OUT. The charging and

discharging the flying capacitor continues at a free running

frequency of typically 2 MHz.

+

EN

2 MHz

Voltage

Doubler

300 k

100 k

1.25 V

GND

IN

5 V

100 mA

OUT

SHDN

CNEG CPOS

Figure 2