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AP8801
500mA LED STEP-DOWN CONVERTER
Application Information (cont.)
LED Current Adjustment/Dimming.
The LED current for the AP8801 can be adjusted by driving the CTRL with a digital signal (PWM dimming) or by driving the CTRL with a dc
voltage between 0.3V and 2.5V (DC dimming).
If the CTRL pin is driven by an external voltage (lower than 2.5V), the average LED current is:
I LED =
V CTRL
V REF
×
V THD
R SET
where V REF is nominally 1.25V
600
LED Current @
500
0.4
0.82
V CTRL = 1.25V
LED Current @
V CTRL = 2.5V
LED Current @
400
0.47
1
V CTRL = 0.625V
0.56
1.2
300
0.68
0.82
1.5
200
0.47
1
1.2
2
0.68
1.5
2
3
100
0
0.82
1
1.2
1.5
2
3
3
0
0.3
0.6
0.9
1.2
1.5
1.8
2.1
2.4
2.7
3
Figure. 17 LED Current vs. R SET CTRL
R SET VALUE ( Ω )
and V
Figure 17 shows that reducing the CTRL voltage by a factor of 2 also reduces the LED current by a factor of 2. The AP8801 has the ability
vary the LED current by a factor of 2 above the default value set by RSET down to a factor of 0.24 of the nominal LED current. This provides
an 8.33:1 dynamic range of the dc dimming.
A low pass filter on the CTRL pin of the AP8801 automatically provides some soft-start function of the LED current on initial start-up (this
phenomenon can be seen in figure 7); the built in soft-start period can be increased by the addition of an external capacitor onto the CTRL
pin.
The AP8801’s dimming range can be increased above this dc dimming factor by applying a PWM signal to the CTRL pin using this method
dimming dynamic ranges above 100 can be achieved.
AP8801
Document number: DS31765 Rev. 7 - 2
8 of 14
www.diodes.com
June 2012
? Diodes Incorporated
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