AMLDP-Z Datasheet, PDF (4/18 Pages) AIMTEC – Up to 1000mA | LED Driver

Output Current Adjustment by External DC Control Voltage:
Series AMLDP-Z
Up to 1000mA | LED Driver
The nominal output current is given by:
Vadj
Ioutnom = Iout
1.25
VADJ
0.3 -1.25V
Vctrl +5v
GND
AMLDP-Z
-Vin
+Vout
-Vout
1^st LED
1
Last LED
1
R1 30K
VADJ
R2
10K
AMLDP-Z
-Vin
+Vout
1^st LED
1
-Vout
1
VADJ =
R2
R1 + R2
X Vctrl
+Vin
4.7K
10K
1 _TL431
VADJ
10K
AMLDP-Z
-Vin
+Vout
1^st LED
1
-Vout
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.
The nominal output current is given by:
Ioutnom= Iout x Radj
Radj + 200K
CADJ
RADJ
VADJ
AMLDP-Z
-Vin
+Vout
1^st LED
1
-Vout
1
NOTE: Typical error is ±10% with resistive dimming control
If the value of Radj is between 0 to 2MΩ, the maximum adjustment range will be 25% to 90%, (for Vin –Vout <10VDC)
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