Series AMLDL-Z
Up to 1000mA | LED Driver
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:
0.1 x DPWM
[for 0<DPWM<1]
Iout ˜
X
1.25V
0V
+Vout
PWM
VADJ
AMLDL-Z
-Vin
GND
-Vout
1
1
st
LED
Model Number
AMLDL-3030Z
AMLDL-3035Z
AMLDL-3050Z
AMLDL-3060Z
AMLDL-3070Z
AMLDL-30100Z
X
0.327
0.280
0.197
0.165
0.1388
0.095
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
VADJ
10K
1
1
st
LED
AMLDL-Z
-Vin
1
1
1.25V
0V
-Vout
Last LED
GND
Driving the VADJ from a Microcontroller
The VADJ can be driven from an open drain output of a microcontroller as shown below. The diode and resistor serve to
suppress any possible high amplitude negative voltage spikes to the VADJ input resulting from the drain to source
capacitance of the FET. Any negative voltage spikes will cause errors in output current and/or unstable driver operation.
+Vout
MCU
VADJ
10K
1
1
st
LED
AMLDL-Z
-Vin
1
1
-Vout
Last LED
GND
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