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FEATURES

? High efficiency: ≥ 70

? Maximum output current: 40A

? Wide output voltage: 0V ~ 4V

? Wide input voltage: 100VAC ~ 240VAC

? High speed digital modulation: 5kHz

? Configurable valley current for digital modulation

? Low temperature rise: 30°C

? Over-temperature protection

? MBTF (Mean Time Before Failure): 180,000 hours

? Low corner noise at 0.1 ~ 10Hz: 354μAP-P

? Low ripple voltage at 600kHz: <10mVP-P

? Compact size

? Low cost

? 100 lead (Pb)-free and RoHS compliant

APPLICATIONS

Driving high current laser diode bars with high stability and

high efficiency.

DESCRIPTIONS

The AAS40A4V2 is an electronic power supply brick designed

for driving laser diodes with up to 40A low noise current. The

output current can be set by an analog voltage of 0V to 2.5V,

an external potentiometer, or the built-in internal potentiometer,

to between 0 and 40A.

A pulsed output current can be generated by driving the PCN

port with a digital signal, under which, the peak output current

is set by the LISH port while the valley output current is set by

the LISL port. The modulation frequency can go up to 5kHz,

resulting to an approximately 56μS rise/fall time at the output

current.

The AAS40A4V2 laser driver comes with a high stability low

noise 2.5V reference voltage. It can be used for setting the

output current. This reference can also be used as the voltage

reference for external ADCs (Analog to Digital Converters)

and DACs (Digital to Analog Converters), which might be

used for monitoring and/or setting the laser current .

This laser driver brick has a high efficiency: ≥ 70 @ VLDA =

3.5V, IOUT = 40A. It saves energy and has low temperature rise.

There is an over-temperature protection circuit inside, in case

the laser power supply temperature exceeds the temperature

limit, 85°C, the laser driver will shut down itself and be turned

back on by itself after the temperature returns to the normal

temperature range.

There is a soft-start circuit in this laser driver, which ensures

smooth current transactions during power-up period.

In case there is a short circuit at the output, the internal

protection circuit will cut off the output.

The output voltage is automatically set from 0V to 4V to keep

the output current at a pre-set value. When the output voltage

exceeds the maximum value, the driver will not works properly.

The control loop is monitored in real time by an internal circuit,

to make sure that it works properly. The monitoring result is

sent to the LPGD node. When this pin is pulled up internally, it

indicates that the control loop works properly and Loop Good

LED will be lit. This pin signal can be sent to a

microcontroller, or used for driving an LED through a buffer.

The internal equivalent circuit of this pin is a 5kΩ pull-up

resistor connected to a 5V rail in parallel with an open drain

comparator output.

The main specifications are shown in Table 1 below.