Datasheet

Series AMLD-Z
Up to 1000mA | LED Driver
www.aimtec.com Tel: [phone] Toll free: + 1 888 9 AIMTEC
(924 6832)
F 051e R12.B 5 of 13 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
AMLD-Z
-Vin
VADJ
1
st
LED
+Vout
1
1
-Vout
RADJ
CADJ
The output current is given by:
If RADJ is between 0 and 2M ohm, the maximum adjustment
range of Iout is 25% to 90% (for Vin – Vout < 20V)
Ioutnom ≈
Iout x Radj
(Radj + 50K)
Output Current Adjustment by PWM Control:
Driving VADJ Directly
A Pulse Width Modulation (PWM) signal with a duty cycle DPWM can be applied to the ADJ pin as shown below.
AMLD-Z
-Vin
VADJ
1
st
LED
+Vout
1
1
-Vout
PWM
0V
1.25V
GND
Last LED
The output current is given by:
Ioutnom x DPWM
Iout ≈
[if PWM frequency < 300Hz,
for 0.1<DPWM<1]