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In vivo applications / Optogenetics / OptoLED drivers
Ex vivo and in vitro applications / Optogenetics
LED Driver End-stage ST
Optimized for seriously shielded environments in microelectrode laboratories. The output current is as smooth as the current of a lead battery. This design fulfils all the special requirements of any sophisticated electrophysiology applications, even in close position to high impedance recording electrodes. These LED drivers are optimized for optogenetic stimulation, but they also can be used for other light stimulating applications (for instance retinography). They can drive any kind of LED directly, with calibrated current, independently of the LED model. They can even drive the extremely high power and/or huge forward voltage LED types. The internal construction of our LED drivers is based on high precision constant current generators and high speed gating circuits for extremely fast switching of the LED's current.
Special features
- Over-current Protection Circuit, what never allows to override the full scale current, even not in transient or broken output wiring conditions! It is an extremely important feature, because the brightest, highest power LEDs are driven by such level of currents, what are very close to their absolute maximum ratings. These extreme power LEDs need to be carefully protected, because they are terribly expensive.
- Active current sink circuit to eliminate the parasitic charge holding effect of LEDs.
Specifications / Technical Data
- Over-current (in other words Overdrive) Protection Circuit: the full scale current is never overridden!
- Worst-case error of the output current generators: < 5 %
- Compliance voltage of the current generators: 12 V
- Selectable ranges of the output current:
- 5 - 55 mA in 11 steps (each step is 5 mA),
- 10 - 110 mA in 11 steps (each step is 10 mA)
- Active current sink circuit at the output
- Control input: TTL compatible, 0.2 unit-load
- Active level at the control input: TTL High
- External Plug-in DC power supply
Descriptions
Optimized for seriously shielded environments in microelectrode laboratories. The output current is as smooth as the current of a lead battery. This design fulfils all the special requirements of any sophisticated electrophysiology applications, even in close position to high impedance recording electrodes. These LED drivers are optimized for optogenetic stimulation, but they also can be used for other light stimulating applications (for instance retinography). They can drive any kind of LED directly, with calibrated current, independently of the LED model. They can even drive the extremely high power and/or huge forward voltage LED types. The internal construction of our LED drivers is based on high precision constant current generators and high speed gating circuits for extremely fast switching of the LED's current.
Special features
- Over-current Protection Circuit, what never allows to override the full scale current, even not in transient or broken output wiring conditions! It is an extremely important feature, because the brightest, highest power LEDs are driven by such level of currents, what are very close to their absolute maximum ratings. These extreme power LEDs need to be carefully protected, because they are terribly expensive.
- Active current sink circuit to eliminate the parasitic charge holding effect of LEDs.
Specifications / Technical Data
- Over-current (in other words Overdrive) Protection Circuit: the full scale current is never overridden!
- Worst-case error of the output current generators: < 5 %
- Compliance voltage of the current generators: 12 V
- Selectable ranges of the output current:
- 5 - 55 mA in 11 steps (each step is 5 mA),
- 10 - 110 mA in 11 steps (each step is 10 mA)
- Active current sink circuit at the output
- Control input: TTL compatible, 0.2 unit-load
- Active level at the control input: TTL High
- External Plug-in DC power supply
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