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A Product Line of
Diodes Incorporated
ZXLD1371
Applications Information (cont.)
Figure 14. Thermal Feedback Network
The thermistor resistance, R T , at a temperature of T degrees Kelvin is given by
B
R T = R R e
1
T
-
1
TR
Where
R R is the thermistor resistance at the reference temperature, T R
T R is the reference temperature, in Kelvin, normally 273 + 25 = 298K (25°C)
B is the “beta” value of the thermistor.
For example,
1)
Temperature threshold T threshold = 273 + 70 = 343K (70 ? C)
2)
3)
TH1 = 10k ? at 25 ? C and B = 3900
R th = R T at T threshold = 1.8k ?
R T = 1.8k ? @ 70 ? C
Over-Temperature Shutdown
The ZXLD1371 incorporates an over-temperature shutdown circuit to protect against damage caused by excessive die
temperature. A warning signal is generated on the STATUS output when die temperature exceeds 125°C nominal and the
output is disabled when die temperature exceeds 150°C nominal. Normal operation resumes when the device cools back
down to 125°C.
ZXLD1371
Document number: DS35436 Rev. 1 - 2
35 of 42
www.diodes.com
February 2012
? Diodes Incorporated
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