AL8806EV6

AL8806EV6
Issue 1 – June 2011
© Diodes Incorporated 2011
www.diodes.com
7 of 8
Current Setting
The LED current is set by the sense resistor value, R
SENSE
. On this PCB, there are two resistors in
parallel.
R
SENSE
= R
1
* R
2
/ (R
1
+ R
2
)
For the schematic values this gives a resistance of 0.15 * 0.2 (0.15 + 0.2) = 0.0857 ohms.
The LED current flows through R
SENSE
. The sense voltage is 100mV, so the LED current is simply
I
LED
= 0.1/ R
SENSE
For the schematic values this gives an LED current of 0.1/0.0857 = 1.167 A nominally. In practice
there is a slight reduction in current partly due to the resistance of the PCB copper, depending on the
PCB layout. At 1.1A this reduction is typically about 5% using AL8806EV6.
The following table gives commercially available resistor values for typical current requirements,
allowing a current error of 3% maximum not including the effect of PCB copper. A power limit of
125mW is assumed for the 0805 size resistors with 50% de-rating.
LED Current
R1
, ohms
R2
, ohms
150mA 0.68 DO NOT FIT
300mA 0.33 DO NOT FIT
380mA 0.51 DO NOT FIT
500mA 0.2 DO NOT FIT
660mA 0.15 DO NOT FIT
1A 0.2 0.2
1.1A 0.15 0.2
Performance
The performance of the AL8806EV6 demonstrated shows the capability to regulate LED current. The
LED current of 1.1A is approximately 5% lower than the calculated value. This is partly due to copper
resistance. With a load of 2 LEDs, the current changes by less than ±2% over the input voltage range
from 9VDC to 30VDC. With 2 LEDs and a supply of 12VDC, the switching frequency is approximately
440kHz.
For further advice, please contact your local Diodes Field Applications Engineer, or one of our
sales offices listed on the back page of this document.
AL8806EV6
Issue 1 – June 2011
© Diodes Incorporated 2011
www.diodes.com
8 of 8
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AL8806EV6

Mfr. #:
Manufacturer:
Description:
BOARD LED DRIVER MR16 1A
Lifecycle:
New from this manufacturer.
Delivery:
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Payment:
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