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Analog Technologies
ALDD28V15A401
Digital High Voltage Constant Current 15A Laser Driver
Figure 3. Internal Block Diagram of ALDD28V15A401
OPERATION PRINCIPLE
The block diagram of the driver is shown in Figure 3.The
signal from pin 2, EN, is sent to a level detector circuit. As
shown in Figure 4, upon detecting signal 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 temperature protection circuit, upon detecting the
temperature to be >80
°
C, it will force the laser driver into
Standby Mode. The laser driver reinitiates the power up
sequence when the junction temperature drops below 80°C.
The voltage reference circuit provides internal voltage reference
for the driver, its output is taken out after a noise removal circuit
