特点：
The A706 is a high voltage Boost driver with 6 channels
adjustable constant current regulators for notebook LED
backlight applications. Six regulated current ports are designed to
provide uniform and pure DC constant current sinks for driving
LEDs within a large range VF variations. It can drive a number of
LEDs in series/parallel configuration
Users may adjust the output current from 5mA to 40mA
through an external resistor, RSET, which gives users flexibility in
controlling the light intensity of LEDs. It also could adjust LED
brightness via PWM pin with Pulse Width Modulation signal
A feedback circuit is built in the between of Boost Driver
and the Current Regulators. It could sense the lowest dropout
voltage among used channels to Boost Driver in order to maintain
the output voltage in optimal level. An OVP circuit is built for
open-loop protection when any string becomes open.
The thermal protection function protects IC from over
temperature damage. Also, the exposed thermal pad enhances the
package power dissipation.
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