Difference between revisions of "Intensify Nx50 setup guide"
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! State !! Voltage range | ! State !! Voltage range | ||
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| − | | Logic LOW|| -0.3 .. 0.6V | + | | Logic LOW|| -0.3 .. 0.6V (achievable by connecting to GND) |
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| − | | Logic | + | | Logic HIGH|| 3.0 - 7.0 V (achievable by floating pin) |
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Revision as of 10:10, 19 February 2013
This is the intallation & user guide for the Intensify Nx50 laser diode driver. Read it through before operating the device.
In case of any questions, please don't hesitate to contact us.
Contents
Physical installation and cooling
Nx50 should be mounted inside an enclosure by using spacer feet attached to the four corner holes.
Nx50 has low power losses due to highly efficient multiphase switching converter technology. Power loss can be calculated by using the offered efficiency data as reference.
In most cases Nx50 is sufficiently cooled with natural convection. This is best achieved by mounting boards vertically and leaving at least 25 mm free air space around both sides.
However, if natural convection does not offer sufficient cooling (i.e. if peak surface temperature is near or exceeds 100°C), then forced convection is necessary. This can be achieved by placing a fan or blower on the side of PCB so that air flow passes along board surface.
Wiring
CMD connector
CMD connector is the user side I/O of the driver. This connector contains the control and feedback signals. All signal lines of the port are ESD protected by dedicated suppressors.
Mating connector type is a 10 pin flat ribbon cable connector with 0.1"/2.54 mm pin pitch and a polarity key. See spec sheet of compatible connector here.
CMD pin out
| Pin # | Signal name | Direction | Signal description | Impedance vs GND |
|---|---|---|---|---|
| 1 | PULSE | In | Pulse control:
|
20 kOhm |
| 2 | GNDA | Analog ground | 0 Ohm | |
| 3 | IMON+ | Out | Current monitor positive output (differential) | 10 kOhm |
| 4 | IMON- | Out | Current monitor negative output (differential) | 50 kOhm |
| 5 | VMON+ | Out | Voltage monitor positive output (differential) | 10 kOhm |
| 6 | VMON- | Out | Voltage monitor negative output (differential) | 10 kOhm |
| 7 | ISET+ | In | Current setpoint positive input (differential) | 50 kOhm |
| 8 | ISET- | In | Current setpoint negateive input (differential) | 50 kOhm |
| 9 | ENABLE | In | LDD enable:
|
1 kOhm |
| 10 | GND | Power & digital ground | 0 Ohm |
Impedances
When driving an CMD input pin, the source impedance of controller should be significantly lower than input impedance of the corresponding pin. I.e. if input impedance is 50 kOhm, then recommended source impedance is 500 Ohm max. Lower source impedance yields lower voltage drop error.
Also when an output of CMD is connected to the input of controller, the controller input impedance should be significantly higher than CMD pin impedance. I.e. when connecting VMON (10 kOhm) to analog input or ADC, the controller input impedance should be at least 1 MOhm. However all outputs are short circuit proof and input impedance recommendation affects only monitor accuracy.
See impedance column of pin out table
Digital signals
All digital signals (PULSE & ENABLE) are referenced to GND and applicable voltage levels are:
| State | Voltage range |
|---|---|
| Logic LOW | -0.3 .. 0.6V (achievable by connecting to GND) |
| Logic HIGH | 3.0 - 7.0 V (achievable by floating pin) |
Analog signals
Analog input & output signals support differential signaling to cancel noise and ground loop induced error. These are designed to be compatible with another differential source as well as single ended systems.
Connection to differential 0-10V analog I/O:
| Controller | CMD signal |
|---|---|
| Analog in 1 + | IMON+ |
| Analog in 1 - | IMON- |
| Analog in 2 + | VMON+ |
| Analog in 2 - | VMON- |
| Analog out 1 + | ISET+ |
| Analog out 1 - | ISET- |
| Ground | GND |
Connecting to single ended 0-10V analog I/O. Assuming that I/O is referenced to Ground.
| Controller | CMD signal |
|---|---|
| Analog in 1 | IMON+ |
| Ground | IMON- |
| Analog in 2 | VMON+ |
| Ground | VMON- |
| Analog out 1 | ISET+ |
| Ground | ISET- |
| Ground | GND |
Power
A regulated 12VDC power supply should be connected to hole terminals labeled GND and +12V. Required power is nearly directly proportional to output power plus losses.
For example outputting 40A to 2.0V diode equals output power of 80W. With losses the needed power is about 85-90W which equals 7.0-7.5A @ 12V.
Laser diode
Laser diode is connected to hole terminals labeled O+ and O-. O+ goes to LD anode and 0- to cathode.
