FEATURES

High Efficiency: ≥90

Constant Current Output

Maximum Output Current: 4A

Current Output Noise: 4.69μAP-P @ 0.1Hz-10Hz

High Stability: 100ppm/°C

PWM Switching Frequency Synchronizable

Zero EMI

Compact Size

100 Lead (Pb)-free and RoHS Compliant

DIP Package Available

DESCRIPTION

This laser driver is an electronic module designed for

driving diode lasers with up to 4A constant current, high

efficiency, low noise, high reliability, zero EMI, and small

package. Figure 1 shows the photo of actual ATLS4A202D.

It provides these functions: laser constant current control,

laser current monitoring, over current and thermal protection,

switching frequency synchronization, laser diode status

indication, soft start, and shut down.

It comes with a high stability low noise 2.5V voltage reference

output which can be used for setting the output current. The

reference output can also be used for the ADCs (Analog to

Digital Converters) and/or DACs (Digital to Analog

Converters) to monitor the laser output current and/or set laser

output current respectively.

The frequency synchronization of this laser driver allows using

an external digital signal to synchronize the internal PWM

output stage of the laser driver, to eliminate frequency beating

interferences between the laser drivers and other switch mode

electronic circuits on the same PCB.

The external signal needs to be in the range of 520kHz to

800kHz.

If other frequency is needed, contact us, we may be able to

adjust the internal PWM frequency for you. The default

switching frequency of the internal PWM output stage is

500kHz.