- 类型:驱动IC
- 保护:是
。
the al8805 is a step-down dc/dc converter designed to drive
leds with a constant current. the device can drive up to 8
leds, depending on the forward voltage of the leds, in series
from a voltage source of 6v to 30v. series connection of the
leds provides identical led currents resulting in uniform
brightness and eliminating the need for ballast resistors. the
al8805 switches at frequency up to 1mhz. this allows the
use of small size external components, hence minimizing the
pcb area needed.
maximum output current of al8805 is set via an external
resistor connected between the v
in
and set input pins.
dimming is achieved by applying either a dc voltage or a
pwm signal at the ctrl input pin. an input voltage of 0.4v or
lower at ctrl switches off the output mosfet simplifying
pwm dimming
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