Series AMLD-Z
Up to 1000mA | LED Driver
Output Current Adjustment by External DC Control Voltage (VCTRL) (continued):
+Vin
VADJ =
If VCTRL = Vin
R1
4.7K
R2
10K
VADJ
1
If Vin is between 7 VDC and 36 VDC it is
recommended to use the circuit shown below
+Vout
AMLD-Z
-Vin
-Vout
Last LED
1
1
1
st
LED
R3
10K
TL431
Resistive Dimming Control
A simplified dimming control can be achieved using a variable resistor connected between VADJ and GND. Capacitor CADJ
is optional, it is installed to limit AC mains interference and high frequency noise. The recommended value of CADJ is
0.22µF.
NOTE: Typical error is ±10% with resistive dimming control
The output current is given by:
Iout x Radj
Ioutnom
≈
(Radj + 50K)
If RADJ is between 0 and 2M ohm, the maximum adjustment
range of Iout is 25% to 90% (for Vin – Vout < 20V)
+Vout
VADJ
CADJ
RADJ
AMLD-Z
-Vin
-Vout
1
1
www.aimtec.com
F 051e R12.C
Tel: +1 514 620 2722
5 of 13
[
[
R3
R2 + R3
X 2.5
+Vin
R1
4.7K
KDZTR-27B
1
R2
10K
If Vin is between 36 VDC and 60 VDC it is
recommended to use the circuit shown below
+Vout
VADJ
AMLD-Z
-Vin
-Vout
Last LED
1
1
1
st
LED
1
R3
10K
TL431
1
st
LED
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(924 6832)
North America only
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