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AMLDP-Z Datasheet(PDF) 5 Page - AIMTEC

Part No. AMLDP-Z
Description  Up to 1000mA | LED Driver
Download  18 Pages
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Maker  AIMTEC [AIMTEC]
Homepage  http://www.aimtec.ca
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AMLDP-Z Datasheet(HTML) 5 Page - AIMTEC

 
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Series AMLDP-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.C
5 of 18
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.
The output current is given by:
x DPWM
Iout
[for 0.01<DPWM<1]
Ioutnom =
AMLDP-Z
-Vin
VADJ
1st LED
+Vout
1
1
-Vout
PWM
0V
1.25V
GND
Last LED
AMLDP-Z
-Vin
VADJ
1st LED
+Vout
1
1
-Vout
PWM
0V
GND
1
Last LED
1.25V
10K
AMLDP-Z
-Vin
VADJ
1st LED
+Vout
1
1
-Vout
MCU
GND
1
10K
Last LED


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