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BL8580/1

■ DETAILED DESCRIPTION

BL8580/1 works with a wide range of

supply voltage, from 2.7V to 6V. The

forward voltage of commercial white/blue

LED is in the range of 2.9V to 3.5V at a

current level of 20mA. Proper selection of

the LED to match the supply voltage can

fully utilize the Li-ion battery. For example,

there is 1% ~ 3 % power left in the Li-ion

battery when its voltage reaches 3.275V.

So a LED with a forward voltage value of

3.2V can use up to 99% of the battery

power under normal working condition.

When the voltage of the battery drops

below 3.2V, the current through the LED

(hence the brightness) starts to decrease.

Due

its

uniquely designed

current

regulator,

BL8580/1

offer

low

output

dropout and provide superior efficiency

performance over standard Inductive boost

type and capacitive charge pump type LED

driver.

The EN pin controls the on/off state of the

device. A high level state turns on the

device and a low level turns off the device,

results in the low off state current. This pin

needs to be terminated since a floating

level of the EN pin will cause the instability

of the device.

The sink current has a constant value of

20mA. The brightness of the LED can be

adjusted by controlling the duty cycle of the

BL8580/1’s LEDn output. This can be

accomplished by applying a PWM signal to

the EN pin. In BL8580/1, the internal power

on sequence presents a delay time of 6us

from CE pin to LEDn pin. Hence, In order to

normally modulate the output of LEDn in

every cycle, the width of dimming signal

applied CE pin have to be no less than 6us.

For example, when a dimming signal of

20KHz is applied, the minimum range of

dimming is about 12%, that is, the average

output current on each channel is 2.4 mA.

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