Maiman Electronics LLC
SF8300
13
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 lever.
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. 7) clockwise to increases the value of driver output
current amplitude, counterclockwise – to reduce.
Turn TEC potentiometer (10 in Fig. 7) clockwise to increases the desired temperature of laser
module, counterclockwise – to reduce.
19.
Cooling
The board does not require active cooling. Aluminum mount is designed to remove heat
from the laser diode.
20.
Internal protections
The device provides several security features to ensure the safety of the laser module.
The jumper shunts the outputs of driver, to protect the laser diode from static discharges
while installing.
Before installing the laser module on the board, make sure there is a jumper! Remove the
jumper before turning on the driver.
Reverse diode protects the laser diode from reverse current and reverse voltage.
In case of an over-current or an over temperature condition, the control logic disables the driver
and the output shorts
with 2 mOhm shunt
.
Setting the current protection threshold is described in
paragraph 18. The current protection threshold must be less than the laser module absolute
maximum ratings.
The TEC current limit allows setting the maximum current safe for the Peltier module.