Datasheet

Series AMLDLW-Z
Up to 1000mA | LED Driver
www.aimtec.com Tel: [phone] Toll free: + 1 888 9 AIMTEC
(924 6832)
F 051e R9 4 of 11 North America only
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
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.
Model Number X
AMLDLW-3035Z 0.280
AMLDLW-3050Z 0.197
AMLDLW-3070Z 0.1388
AMLDLW-30100Z 0.095
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.
AMLDLW-Z
-Vin
VADJ
1
st
LED
+Vout
1
1
-Vout
PWM
0V
1.25V
GND
Last LED
AMLDLW-Z
-Vin
VADJ
1
st
LED
+Vout
1
1
-Vout
RADJ
CADJ
The output current is given by:
0.1 x DPWM
X
Iout ˜
[for 0<DPWM<1]
AMLDLW-Z
-Vin
VADJ
1
st
LED
+Vout
1
1
-Vout
PWM
0V
GND
1
Last LED
1.25V
10K