Series AMLD-Z

Up to 1000mA | LED Driver

www.aimtec.com

Tel: +1 514 620 2722

Toll free: + 1 888 9 AIMTEC

(924 6832)

F 051e R12.G

6 of 13

North America only

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

+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]

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.

AMLD-Z

-Vin

VADJ

+Vout

1

1

-Vout

PWM

0V

GND

1

Last LED

1.25V

3.3K