28 Chapter 3 Laser Diode Driver Operation
3.5.3.4 Im Lim
The photodiode current limit is a software monitored limit on the current
delivered from the photodiode. Because this limit is a software monitored
limit, shutdown can occur up to a second after the condition is true.
3.5.3.5 Po Lim
Like the
Im Lim
, the photodiode power limit is a software monitored limit
on the power delivered from the photodiode. For this limit to function, the
user must set a
PD Resp
value other than zero. Because this limit is a
software monitored limit, shutdown can occur up to a second after the
condition is true.
3.5.3.6 Tol Time and Tol Iop
The
Tol Time
and
Tol Iop
elements are used for determining when the laser
is “in tolerance.” The
Tol Time
value is expressed in seconds, and can range
from 0.001 seconds to 50 seconds. The
Tol Iop
value is displayed in mA,
and can range from 0.1 mA to 100 mA. When operating in
Im
or
Po
modes,
The
Tol Iop
setting is ignored, and fixed values of 50
µ
A and 50 mW,
respectively, are used. The laser is considered in tolerance after it has been
within the tolerance setting for the set number of seconds. If at any time it
goes outside the tolerance range, the time restarts at zero.
As an example, if the
Tol Time
is set to 5 seconds, the
Tol Iop
is set to 2
mA, and the current set point was 1000 mA, the laser driver would have to
stay within 998 mA and 1002 mA to be within tolerance. Out of tolerance is
indicated by a
OutT
status field on the bottom of the Laser Main Screen.
3.5.3.7 Taux
Taux displays the temperature of the auxiliary temperature sensor.
3.5.3.8 Tamb
Tamb displays the temperature of the internal ambient temperature sensor.
3.5.3.9 Ths
Ths displays the temperature of the output stage heatsink. If this temperature
exceeds 85
°
C, the output will automatically shut off.
3.5.3.10 Vlas
Tlas displays the output voltage of the switching supply used to drive the
laser output.
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