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Analog Technologies

ATLS25A219D

32V 25A Constant Current Laser Driver

spikes when they are not connected well with the load or

when they recover from an over current protection state.

When happens, it may exceed the maximum allowed input

voltage, 28V, of the controller and damage the controller

permanently. To avoid this from happening, do the

following:

1. Connect the controller well with the power supply before

turning on the power.

2. Make sure that the power supply has sufficient output

current. It is suggested that the power supply can

supply 1.2 to 1.5 times the maximum current the

controller requires.

3. When using a bench top power supply, set the current

limit to >1.5 times higher than the maximum current the

controller requires.

4. If the PCB is for mounting the laser driver. See the figures

below for the layout of PGLDC pin. If the PCB has two

layers, the top layer (red) is for routing PGND track, and

the bottom one (blue) is for routing LDC track, see Figure

15. If the PCB has four layers, the top two layers are for

routing PGND track, and the bottom two layers are for

routing LDC track. The section views for two-layer and

four-layer PCB's are shown in Figure16 and Figure 17

respectively.

If the PCB has one layer, see Figure 18 for the layout of

PGND pin.

Figure 15. The Layout for the Two-Layer PCB

Figure 16. The Section View for the Two-Layer PCB

Figure 17. The Section View for the Four-Layer PCB

Figure 18. The Layout for the Single-Layer PCB