AL8806MP8-13 Diodes Zetex, AL8806MP8-13 Datasheet - Page 11

• Manufacturer Part Number: AL8806MP8-13
• Manufacturer: Diodes Zetex

Specifications of AL8806MP8-13

• Lead Free Status / Rohs Status: Supplier Unconfirmed

Applications Information
PWM Dimming
LED current can be adjusted digitally, by applying a low frequency Pulse Width Modulated (PWM) logic signal to the CTRL pin
to turn the device on and off. This will produce an average output current proportional to the duty cycle of the control signal.
In particular, a PWM signal with a max resolution of 10bit can be applied to the CTRL pin to change the output current to a
value below the nominal average value set by resistor R
than 500Hz, however higher dimming frequencies can be used - at the expense of dimming dynamic range and accuracy.
Typically, for a PWM frequency of 500Hz the accuracy is better than 1% for PWM ranging from 1% to 100%.
AL8806 (Preliminary)
Document number: DS35144 Rev. 1 - 1
700
600
500
400
300
200
100
70
60
50
40
30
20
10
0
0
0%
0%
10%
1%
20%
2%
(cont.)
Figure 3. Low duty cycle PWM Dimming at 500Hz
30%
3%
Figure 2. PWM Dimming at 500Hz
40%
4%
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PWM dimming [%]
PWM dimming [%]
SET
HIGH EFFICIENCY 30V 1.5A BUCK LED DRIVER
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. To achieve this resolution the PWM frequency has to be lower
50%
5%
60%
6%
(PRELIMINARY)
70%
7%
80%
8%
90%
9%
AL8806
© Diodes Incorporated
February 2011
100%
10%