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Analog Technologies

ATLS25A219GUI

32V 25A Constant Current Laser Driver

exceeds the limit, 120

°C, the laser driver will shut down the

output stage by itself and force the laser drive into Standby

Mode. There is a loop good indication output to tell if the

laser driver works well.

The laser driver has 3 states: Operation, Standby and

Shutdown. Under Standby mode, all the laser driver

components will be working except the output stage, see

Figure 7. Under Shutdown mode, all the components of the

laser driver stop working and the power supply current is

reduced to < 2mA.

This laser driver generates a high accuracy high stability low

noise. When outputting 25A to the laser, the noise current is

output current stability is <100ppm/

°C. It comes with a low

noise high stability voltage reference which can be used for

setting the output current and also be used as the reference

voltage for the ADCs (Analog to Digital Converters) and/or

DACs (Digital to Analog Converters).

For noise sensitive applications, please be aware that this laser

driver has very low noise between DC to 10Hz, but there is a

500kHz sine-wave ripple voltage, around 10mVpp, present at

the output, the LDA port.

Communication function

Utilizing serial port communication, Single Chip Micyoco sends data to computer through USB serial communication interface.

With the data received from the SCM, computer decodes the data to get the real-time status of SCM control system. Then the

computer will show the user window procedure which is made by the windows.

Figure 5. Computer Control Interface

As shown in Figure 14, the power terminals above the

controller are VPS, LDPGND, LDC and LDA. As shown in

Figure 16, below the controller, from left to right, there are

LEDs for loop good indication, Mini USB, Type-C, and

controller switch. The controller can be connected to the

computer by Mini USB, and the parameters can be set on

the computer. It can also be connected to the evaluation

board using Type-C, and the parameters can be set by the

analog circuit. Whether the parameters are set by the

computer or the analog circuit, the data will be displayed on

the computer. After setting the parameters, click "OK" and

the controller starts to work.

Vps: Power Supply Voltage.

LDA: The voltage of laser

LIO: Laser Current Output Indication. 0V to 4.096V

indicates the laser current being from 0 to 25A

linearly.

Io: Output current of the laser

LISH: Laser Current High Value Setting Voltage.

LISL: Laser Current Low Value Setting Voltage.

PCN: Pulse Control