AMLDLW-Z_13 Datasheet, PDF (5/12 Pages) AIMTEC – Up to 1000mA | LED Driver

Series AMLDLW-Z
Up to 1000mA | LED Driver
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
NOTE: Typical error is ±10% with resistive dimming control
CADJ
RADJ
VADJ
AMLDLW-Z
-Vin
+Vout
1^st LED
1
-Vout
1
Output Current Adjustment by PWM Control:
Driving VADJ Directly
A Pulse Width Modulated (PWM) signal with a duty cycle of DPWM can be applied directly to VADJ pin as shown below.
The output current is given by:
Iout ˜ ^{0.1 x DPWM}
X
[for 0<DPWM<1]
Model Number
AMLDLW-3035Z
AMLDLW-3050Z
AMLDLW-3070Z
AMLDLW-30100Z
X
0.280
0.197
0.1388
0.095
PWM
1.25V
VADJ
0V
GND
AMLDLW-Z
-Vin
+Vout
1^st LED
1
-Vout
Last LED
1
Driving VADJ Via Open Collector Transistor
The VADJ can also be driven via an open collector transistor as shown below.
The diode and resistor serve to suppress any possible high amplitude negative voltage spikes to the VADJ input resulting
from the collector to emitter capacitance of the transistor. Any negative voltage spikes will cause errors in output current
and/or unstable driver operation.
+Vout
PWM
1.25V
0V
VADJ
10K
AMLDLW-Z
-Vin
-Vout
1^st LED
1
Last LED
1
1
GND
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