Intensify Nx50 setup guide
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 | I/O and 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 ground, internally bridged to GNDA | 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 GNDA and applicable voltage levels are:
| State | Voltage range |
|---|---|
| Logic LOW | -0.3 .. 0.6V |
| Logic HIGH | 3.0 - 7.0 V |
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. The differential signals allow up to +/- 1.5V difference on ground reference potentials between Nx50 and controller without losing accuracy.
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.
Connecting parallel
To be written
Usage
The device starts operating instantly after powered and and proper signals fed to CMD pins. No other initialization needed, however following start up & shut down sequences are recommended to prevent current overshoot:
Note: items with "or" means that either of these should be fulfilled or both of them. However fulfilling both does not cause further improvement.
- Power-on
- ENABLE=HIGH/open and PULSE=HIGH or ISET=0V (start condition)
- Power on 12V
- Set ENABLE to LOW
- set PULSE=LOW or set ISET to desired voltage.
- Power-off
- Set PULSE=HIGH or ISET=0V (this step optional)
- Set ENABLE=HIGH
- Power off 12V
CW usage
- Mandatory connections
- LD connected between O+/O-
- 12VDC supply connecter between +12V/GND
- CMD connector pins:
- GNDA connected to controller's ground reference:
- 0-10V current setpoint signal fed to ISET+/ISET-
- ENABLE set to LOW or tied to GNDA
- Optional CMD connections
- IMON+/IMON- wired to analog input
- VMON+/VMON- wired to analog input
- PULSE set to HIGH or left open
Pulsed usage
For pulsed usage it is recommended to use PULSE input or modulate the ISET analog voltage. It is not recommended to set current to 0 during off-periods for to achieve faster pulse rise times and zero overshoot. Recommended bias current during off-periods is 2-10% of current setpoint.
- Mandatory connections
- LD connected between O+/O-
- 12VDC supply connecter between +12V/GND
- CMD connector pins:
- GNDA connected to controller's ground reference:
- 0-10V current setpoint signal fed to ISET+/ISET-
- ENABLE set to LOW or tied to GNDA
- PULSE set pulse source. Logic LOW means 100% of set current and HIGH reduces output current to 5% (bias current to allow faster rise time)
- Optional CMD connections
- IMON+/IMON- wired to analog input
- VMON+/VMON- wired to analog input
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