Analog Technologies ALDD28V15A401 Скачать руководство пользователя страница 8

 

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Analog Technologies 

ALDD28V15A401

Digital High Voltage Constant Current 15A Laser Driver

WORKING PRINCIPLE 

1. After the controller is powered on, turn the switch on the 
lower right to “SB”, the display contents are as follows:  

 

2. Press the “Set” button, enter the password, and then enter 
the setup mode. 

Press the “Set” button, the display contents are as follows: 

  

Two digits stand for the password. When the last digit 
flashes, use “

” to change the number (0 ~ 9); press the “Set” 

button to select which digit to be changed. When the first 
digit flashes, use “

” to change the number (0 ~ 9). The 

default password is "99". Once you enter the correct 
password, you can start setting up the controller. 

3. After entering the correct password, press and hold the 
“Set” button to enter the setup mode. The display contents 
are as follows: 

 

We can select internal control or external control by pressing 
the “

” button, then press the “Set” button to lock the 

selection, or press and hold the “Set” button to enter the 
internal control or external control current setting. 

 

 

 

 

 

The current can be adjusted by pressing the “Set” button to 
place the cursor. Use the "

" button to adjust the current. 

 

Or 

 

After setting the current, press and hold the “Set” button to 
save the setting and exit to the initial state.

  

 

Press “

” button to switch between the connection state and 

temperature state 

 

Содержание ALDD28V15A401

Страница 1: ...le mode laser diodes to achieve mode hop free and narrow optical wavelength drift thus long coherent length Because of the high efficiency the laser driver generates a small amount of heat thus no heat sink is necessary for normal operation The fully shielded case blocks all the incoming and outgoing EMIs Electro Magnet Interferences Therefore this laser will not interfere other surrounding electr...

Страница 2: ... states between 0V 0 3V it shuts down the entire laser driver between 0 5V 1 2V it sets the laser driver to standby mode between 1 5V 28V it sets the laser driver to operation mode The input current on this pin is 2µA 6 LPGD Digital Output Loop Good indication When the laser driver s output current equals the set point current value and there is no short nor open circuit at the output this pin is ...

Страница 3: ...A Low frequency output current noise peak to peak value 0 1Hz to 10Hz 15 µAP P Stability 15A 20 C 80 C 0 01 650 µA Laser current control signal at LIS 0 1 4 096 V LIS control accuracy 0 1 Laser current indication signal at LIO 0 1 4 096 V LIO indication accuracy 0 2 Reference output voltage 4 096 0 008 V Output voltage range at LDA 0 1VVPS to 0 8VVPS V Output voltage at LDC 0 V Power supply voltag...

Страница 4: ...ignal level between 0V to 0 3V the shutdown output is activated It shuts down the whole laser driver and drives the laser driver into shutdown Mode Upon detecting the level to be between 0 5 and 1 2V the standby signal is activated it puts the controller into Standby Mode When the signal is between 1 5V and above the controller is driven into Operation Mode Figure 4 Input Control There is a temper...

Страница 5: ... the output current is 0A the LIO voltage is 0V when output current is 15A the LIO voltage is 4 096V The relationship is VLIO V IOUT A 15 A 4 096 V IOUT A VLISL V 4 096 V 15 A VLIO is the voltage on the LIO pin The output stage is designed to achieve low noise high efficiency and relatively high modulation speed It has an over current protection circuit There is a soft start circuit which increase...

Страница 6: ...ser diode to turn off the laser beam such as half of its value Use the LIS pin to set the laser current when the laser diode is turned on In this way the laser beam is turned on and off while the driver control loop is always kept on so that the output stage is always under control no distortion is caused by turning on off the output stage When LPGD pin is high 2V the laser diode control loop is w...

Страница 7: ...igure 6 The output current will be IOUT A 3 662 VLIS LIS can also be set by using a DAC to replace the W1 in Figure 6 Make sure that the DAC has low output noise Monitoring the Output Current The output current of the driver can be monitored by measuring the voltage on the LIO pin This feature is very useful for a micro driver based system where the ADC is available and monitoring of the current i...

Страница 8: ...umber 0 9 press the Set button to select which digit to be changed When the first digit flashes use to change the number 0 9 The default password is 99 Once you enter the correct password you can start setting up the controller 3 After entering the correct password press and hold the Set button to enter the setup mode The display contents are as follows We can select internal control or external c...

Страница 9: ... 310 C 590 F and solder the driver manually so that the internal contents of the driver would not be affected After the soldering it is also safe to check the laser driver s functionality by using the dummy laser before connecting a real laser diode as mentioned previously on page 4 NOTE The power supplies may have over shoot voltage spikes when they are not connected well with the load or when th...

Страница 10: ...on being relied on is current and complete 3 All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgment including those pertaining to warranty patent infringement and limitation of liability Testing and other quality control techniques are utilized to the extent ATI deems necessary to support this warranty Specific testing of all parameters of ea...

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