LDTC1020 datasheet(21/27 Pages) WAVELENGTH

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LDTC0520 / LDTC1020 LASER DIODE AND TEMPERATURE CONTROLLER

SAFELY TIE THE POWER SUPPLY INPUTS

If the laser diode is case-grounded with either the laser

anode or cathode tied to the case, then special attention

must be paid to the power supply wiring.

Figure 30 is a block diagram of the LDTC laser controller;

internally the V

DD_FL pin is connected directly to the laser

anode pin.

Internal

Laser Driver

Electronics

VDD_FL

Power

Supply

LDTCxx20

INCORRECT

J1-1

J3-1

J3-2

J3-4

J1-4

Figure 30. Case-Shorted Laser and

Earth-Grounded Power Supply

Note that if the negative terminal of the power supply ground

is connected to earth ground, then the power supply is

effectively shorted to ground via the laser diode case. The

power supply will overheat, blow a fuse, or otherwise fail.

To remedy the situation, connect the GND pin on connector

J1 to the negative terminal of the power supply, but not to

Earth ground. Refer to

Figure 31.

Internal

Laser Driver

Electronics

LDTCxx20

J1-1

J3-1

J3-2

J3-4

J1-4

CORRECT

VDD_FL

Power

Supply

Figure 31. Case-Shorted Laser and

Floating-Ground Power Supply

Similarly, if the laser package connects either the TEC or

thermistor to the case, then the TE power supplies must be

floating with respect to earth ground.

Application Note AN-LD16: Grounding with Special Laser

Diode Configurations goes into more detail with respect to

safely grounding power supplies with case grounded laser

diodes.

If you have questions about connecting your power supplies,

contact the factory immediately.

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