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- The 560B Laser Diode Driver offers all the performance of the most advanced laser diode controllers for a fraction of the price. Quiet and stable 3000 or 6000 mA current driver for use in the most demanding applications, such as spectroscopy and fiber optic communications.
- Newport Corporation, a widely known leader in laser diode control and test instruments, introduces all new 5700 Series High-Power Laser Diode Drivers, available in one of the following configurations: 30 A – 5 V (Model 5700-30-5), 80 A – 7.5 V (5700-80-7), 150 A – 20 V (5700-150) and a 100 A – 30 V (5700-100).
- MultiSource Laser Controllers. The new 7000 Series MultiSource Multi-Channel Laser Diode Drivers provide the same accuracy and safety as our other benchtop models, but in a much higher density. Available with up to 4A per channel, the MultiSource is an excellent building block for system applications such as device burn-in and characterization.
A 5 V reference voltage is created by the Zenner diode D2 and the resistor R4. This voltage is filtered by the use of the capacitor C2 and applied to the input of the opamp connected as buffer. The buffer is loaded with trimmer potentiometer connected to ground. In this way on its middle terminal the voltage can vary between 0 and the reference voltage. The second opamp together with the power NMOS transistor work as voltage to current converter - the source voltage of the transistor is identical to the input voltage of the second opamp. This voltage appears at the current defining resistor R5. The generated current is Igen=Vin/R5, where Vin is the voltage drop over R5 and also the input voltage of the second opamp. I have used 5V Zenner diode and 10 Ohm R5 resistor - the maximum possible generated current is 500 mA. If higher current is needed, either the reference voltage should be increased, either the value of R5 shall be reduced. Because high current can flow through the NMOS transistor, it must be enough strong to sustain it.
Typekit web fonts. The power generated by the R5 must be also properly dissipated. In my case the maximum power generated by R5 is 2.5W - 5V*0.5A. I have used 5 W resistor. The resitor R3 is optional. In some cases R1 also. R2 and C1 are used to protect the laser diode from some voltage spikes.
Some words about the used opamp and NMOS transistor:
The power NMOS transistor normally has a big working area, what in most of the cases presumes big input capacitance. For some devices it can reach some dozens of nanofarades. This capacitance appears as capacitive load for the opamp. The opamp must be able to drive such kind of big capacitive load, without losing its stability. Some opamps are compensated for similar loads, but a plenty of standard opamps will oscillate. You have carefully to check in both datasheets ( of the opamp and the NMOS ), what is the gate capacitance of the power NMOS transistor, and is the opamp stable with this load. In some cases, even the opamp is not stable with the specific NMOS transistor as load, the stability can be drastically improved by the 'isolating' the load from the opamp output by the use of simple resistor. This in the schematics is the function of R1. If you have stability problems, you can play with the value of R1 and to try to reach the stable operation.
The LD is connected at JP1, the pwer supply at JP2.
Typekit web fonts. The power generated by the R5 must be also properly dissipated. In my case the maximum power generated by R5 is 2.5W - 5V*0.5A. I have used 5 W resistor. The resitor R3 is optional. In some cases R1 also. R2 and C1 are used to protect the laser diode from some voltage spikes.
Some words about the used opamp and NMOS transistor:
The power NMOS transistor normally has a big working area, what in most of the cases presumes big input capacitance. For some devices it can reach some dozens of nanofarades. This capacitance appears as capacitive load for the opamp. The opamp must be able to drive such kind of big capacitive load, without losing its stability. Some opamps are compensated for similar loads, but a plenty of standard opamps will oscillate. You have carefully to check in both datasheets ( of the opamp and the NMOS ), what is the gate capacitance of the power NMOS transistor, and is the opamp stable with this load. In some cases, even the opamp is not stable with the specific NMOS transistor as load, the stability can be drastically improved by the 'isolating' the load from the opamp output by the use of simple resistor. This in the schematics is the function of R1. If you have stability problems, you can play with the value of R1 and to try to reach the stable operation.
The LD is connected at JP1, the pwer supply at JP2.
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Newport 505 Laser Diode Driver
Was $295.00 Save 30%![Newport Laser Diode Driver Newport Laser Diode Driver](/uploads/1/2/5/0/125063479/776610211.jpg)
Pulsed laser diode drivers allow for the modulation of a laser diode using by varying the laser drive current. The Newport 560B series precision laser diode driver offers multiple protection features in addition to a high stability and very low noise output. An easy to use and intuitive front panel interface is complemented by a standard USB rear panel connection which is offered with LabView drivers.
Laser Diode Driver Ic
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