FEATURES

 High efficiency: ≥ 76

 Maximum output current: 45A

 Wide output voltage: 0V ~ 4V

 Wide input voltage: 100VAC ~ 240VAC

 High speed digital modulation: 5kHz

 Configurable output current and voltage limit

 Configurable digital modulation valley current

 Low temperature rise: 30°C

 Over-temperature protection

 Operating temperature: −20°C ~ 50°C

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

 The ripple noise at 600kHz: <10mVP-P

 Compact size

 Low cost

 100 lead (Pb)-free and RoHS compliant

APPLICATIONS

Driving diode lasers with high current and high stability,

such as fiber lasers, diode laser bars, etc.

DESCRIPTIONS

The AAS45A4V2 is an electronic power supply block

designed for driving diode lasers with up to 45A low noise

current. The output current can be set by an analog voltage

of 0V to 2.5V, an external potentiometer, or an internal

potentiometer, to between 0A and 45A.

A pulsed output current can be generated by controlling 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 AAS45A4V2 laser driver comes with a high stability low

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

output current and maximum output voltage. 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 and maximum output voltage, the so-called

compliance voltage.

This laser driver block is highly efficient: its efficiency is

≥ 76. 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 periods.

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. The maximum voltage can

be set by a potentiometer to between 0V and 4V. When the

output voltage hits this set maximum value, the output voltage

remains to be the maximum value and output current stop

following the set value, the laser driver will be working under

constant voltage mode.

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 in parallel

with an open drain comparator output.

The main specifications are shown in Table 1 below.