So i've been building a driver based on the iC-Haus, iC-HKB, driver chip [LINK].
I've run a test using a laser diode test load which gave me expected curves of current vs control voltage as below;
This shows the current output versus control voltage for a range of control resistances (0ohm to 22Ohm)
Then when i ran the same tests with the actual diode (Sony SDL3232VF 50mW 405nm) I got the following output current (photo diode voltage also logged);
I expected the LED zone then the ramp up at threshold, but did not expect the platau with little change in current and monitor voltage. Is this something that others have come accross?
The biggest difference is that I needed to use the 0 ohm setting, which when running the dumb test load and the data sheet for the driver should be passing maximum 150mA at a control voltage of 2.5V. Using the actual diode i was barely getting 50mA at 4.0V control voltage. All the tests were run with a 5.3V regulated supply voltage
I've run a test using a laser diode test load which gave me expected curves of current vs control voltage as below;
This shows the current output versus control voltage for a range of control resistances (0ohm to 22Ohm)
Then when i ran the same tests with the actual diode (Sony SDL3232VF 50mW 405nm) I got the following output current (photo diode voltage also logged);
I expected the LED zone then the ramp up at threshold, but did not expect the platau with little change in current and monitor voltage. Is this something that others have come accross?
The biggest difference is that I needed to use the 0 ohm setting, which when running the dumb test load and the data sheet for the driver should be passing maximum 150mA at a control voltage of 2.5V. Using the actual diode i was barely getting 50mA at 4.0V control voltage. All the tests were run with a 5.3V regulated supply voltage
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