A708

Copyright

© 2007 ADDtek Corp.

6

DD076_A

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AUGUST 2007

Li-ion Battery Voltage Supply

The A708 can work with Li-ion battery. The supply voltage of Li-ion battery ranges from 4.5V down to lower

voltage range and LED forward voltage can be set to fully utilize Li-ion battery energy. For example, if the forward

voltage of white LED is 3.2V at 20mA, the Li-ion battery can discharge until output voltage reaches 3.275V (normally

around 1% ~ 3% power left in the battery). When Li-ion battery voltage is lower than the 3.275V, the LED current

(brightness) will start to decrease.

Enable

A708

EN

LED2

VDD

GND

LED1

LED3

Li-ion

Battery