Laser connections
The CTL100 is compatible with Type 2 butterfly laser diodes. Note that is is only
compatible with floating diodes, which means that neither the anode nor the cathode
should be connected to the case.
Enable switch
1 ON: Enable laser current.
2 ON: Enable TEC current. Turn off the power supply before changing this switch.
Terminal block connections
•VCC: Connect this pin to a 5V power supply (2 A minimum). The high power supply
rejection of the current driver allows the use of a switched power supply with minor
degradation of the noise performance. At a laser current of 400 mA, the CTL100 draws 510
mA (TEC current disabled). An eFUSE protects the CTL100 against overvoltage (6.1 V) and
overcurrent (2 A).
•TACT: Temperature monitoring pin. The thermistor value is given by R
th
= 10
k
Ω
×(10.5V−V
TACT
)/(5.5V+V
TACT
). The output is current-limited with a 1 k
Ω
resistor.
•TSET: Temperature setpoint monitoring pin. V
TSET
=V
TREF
+V
TMOD
/10, where V
TREF
is the voltage
generated by the temperature trimming potentiometer. The voltage V
TREF
can be tuned
between 0 and 2.5 V and can be measured at test point TP2. V
TMOD
is the voltage applied at
the TMOD pin. The PID controller tries to make the voltage V
TACT
equal to the setpoint V
TSET
.
The output current is limited with a 1 k
Ω
resistor.
