Maiman Electronics SF8025, SF8075, SF8150, SF8300
15
Connect the measuring instrument to the «Driver Current Monitor» pin.
If it is necessary to increase the limitation level, turn the potentiometer DRV OC clockwise
for a few turns.
Turn on the driver. Set the current equal to the desired current protection threshold with
the potentiometer CURRENT. Then slowly turn the potentiometer DRV OC counterclockwise until
the protection is activated. Restart the driver to reset an error. Make sure that the protection is
triggered at the correct current level.
You can also set the current level by analogue or digital signals.
Set current to zero, turn off the driver.
18.5. How to control by digital signals
Use the digital control connector. You can use UART or RS-232. The USB-UART converter can
be used (optional) to connect the device to computer.
See paragraphs 22-23.
18.6. How to control by analogue signals
CURRENT and TEC control selectors must be in the EXT position.
Use the analogue control connector.
If you connect pins 2 and 3 to pin 1 (5V) before power up the device, the driver
will not turn on.
See paragraph 16.
18.7. How to control by board switches
CURRENT and TEC control selectors must be in the INT position.
Use two-position switch to start/stop laser diode driver or temperature stabilization. If you
set onboard switch to ON before power up the device, the driver will not turn on.
Turn CURRENT potentiometer (9 in Fig. 9) clockwise to increases the value of driver output
current amplitude, counterclockwise – to reduce.
Turn TEC potentiometer (10 in Fig. 9) clockwise to increases the desired temperature of laser
module, counterclockwise – to reduce.
19. PID coefficients
The device allows you to set P, I and D coefficients independently of each other. The
coefficients can be set in software or using digital commands.
The PID regulator works regardless of the control mode, both in analog and digital modes.
The default values are shown in the table. In most cases, default configuration will work well
with butterfly laser diodes.
There may be instability in the operation of the thermal controller on some DFB diodes. In
this case, set the configuration for DFB diodes.
Proportional coefficient sets direct response to the error signal. The value 100 is equal to a
multiplier of 1, the value of 20 is equal to a multiplier of 0.2.
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