Series AMLD-Z
Up to 1000mA | LED Driver
Output Current Adjustment by External DC Control Voltage (VCTRL) (continued):
[
R3
VADJ =
X 2.5
[
R2 + R3
+Vin
+Vin
If VCTRL = Vin
R1
4.7K
R1
4.7K
R2
If Vin is between 7 VDC and 36 VDC it is
recommended to use the circuit shown below
1
KDZTR-27B
If Vin is between 36 VDC and 60 VDC it is
recommended to use the circuit shown below
R2
10K
+Vout
1st LED
1
VADJ
10K
+Vout
AMLD-Z
-Vin
1st LED
1
1
R3
-Vout
VADJ
AMLD-Z
-Vin
TL431
1
R3
10K
-Vout
Last LED
1
TL431
10K
Last LED
1
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
1st LED
1
VADJ
AMLD-Z
-Vout
CADJ
RADJ
-Vin
1
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