THORLABS ITC1 Series, Operation Manual

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© 2018 Thorlabs GmbH 14
ITC1xx
4 Operating Instruction
4.1 Connecting the Power Supply
The ITC1xx OEM board requires a supply voltage of ± (12 ... 15) V for internal operation and for
power supply of the laser diode and the TEC element.
The power supply must be regulated and free of ripple. The voltage must not exceed the range
of ± (11.4 ...15.8) V. Lower voltages will cause the unit to operate improperly, higher voltages
may damage the ITC1xx.
The power supply must be able to deliver the following current, both for the positive and negat-
ive supply voltage:
ITC102: 2.4 A
ITC110: 3.2 A
ITC133: 3.2 A
Note
Above current values are given without respect to power consumption of the ITC100D display
module, if used.
Note
The total combined output current for the ITC133 is limited by the total thermal dissipation loss.
With the standard heat sink, the total output current should be limited to 3 A (I
LD
+I
TEC
optimized cooling, e.g. using a fan or a bigger heat sink, allows 3 A LD current and 3 A TEC
current at the same time, provided that the power supply can deliver 6.1 A.
Note
With ±15 V power supply and high output currents, the internal power dissipation of the ITC1xx
increases significantly. This may cause a degradation of the specifications. In such cases the
use of a ±12 V supply is recommended.
The increase of the heat sink temperature for a vertically installed ITC1xx board without forced
air cooling can be calculated as follows:
(U
S
= Supply voltage)
Example:
I
TEC,out
= 2 A; U
TEC,out
= 2.5 V; I
LDCOUT
= 0.2 A; U
LDCOUT
= 2V; U
S
= ±12V
This results in an temperature increase ∆T = 37.6 K. At 25 °C ambient temperature the heat
sink temperature reaches 62.6 °C.
Note
Using the ITC1xx with the display module ITC100D leads to an additional increase of the heat
sink temperature for about 3 K.
The horizontal mounting of the ITC1xx board degrades the heat dissipation, so that the heat
sink temperature increases! Forced air cooling may be required.
The maximum heat sink temperature is +85° C. When this limit is exceeded, the over-tempera-
ture protection activates and switches off the TEC and LDC outputs. The controller can be
switched on again only after the temperature has dropped by about 10° C.