Series AMLD-Z

Up to 1000mA | LED Driver

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Tel: +1 514 620 2722

Toll free: + 1 888 9 AIMTEC

(924 6832)

F 051e R12.G

5 of 13

North America only

Output Current Adjustment by External DC Control Voltage (VCTRL) (continued):

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

+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)

AMLD-Z

-Vin

VADJ

+Vout

1

1

-Vout

+Vin

1

TL431

10K

10K

4.7K

Last LED

R1

R2

R3

If Vin is between 7 VDC and 36 VDC it is

recommended to use the circuit shown below

AMLD-Z

-Vin

VADJ

+Vout

1

1

-Vout

1

TL431

10K

10K

Last LED

R2

R3

If Vin is between 36 VDC and 60 VDC it is

recommended to use the circuit shown below

+Vin

4.7K

R1

1

KDZTR-27B

[

VADJ =

R3

R2 + R3

X 2.5

If VCTRL = Vin