AS273
Over-Temperature Detector
Current Programming
There are three different over-temp thresholds
for each AS273. The detector senses the amount
of current being shunted through the 2.5 V refer-
ence of pin 1 and programs an over-temp thresh-
old based on the magnitude of that current. Fig-
ure 10 illustrates the ranges of reference shunt
current, IREF, associated with each of the three
over-temp thresholds, OT1, OT2 and OT3.
OT3
OT2
OT1
Output Disabled
Transition Regions
0
1
2
3
4
5
Reference Shunt Current, IREF (mA)
Figure 10. Reference Shunt Current Programming Ranges of Over-temperature Thresholds
ASTEC Semiconductor
8