This laser driver is an electronic module designed for  driving diode lasers with up to 3A constant current, high  efficiency, low noise, high reliability, zero EMI, and small  package. It provides these the functions: laser constant current control,  laser current monitoring, over current and thermal protection, laser current output indication, 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). 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.