Series AMLDL-RZ

Up to 700mA | LED Driver

www.aimtec.com

Tel: +1 514 620 2722

Toll free: + 1 888 9 AIMTEC

(924 6832)

F 051e R12.F

5 of 17

North America only

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.

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.

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.

AMLDL-RZ

-Vin

VADJ

+Vout

1

1

-Vout

PWM

0V

1.25V

GND

Last LED

AMLDL-RZ

-Vin

VADJ

+Vout

1

1

-Vout

PWM

0V

GND

1

Last LED

1.25V

10K

AMLDL-RZ

-Vin

VADJ

+Vout

1

1

-Vout

MCU

GND

1

10K

Last LED

The output current is given by:

x DPWM

Iout

[for 0.01<DPWM<1]

Ioutnom =