ZXLD1371EST16TC datasheet(35/42 Pages) DIODES

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35 / 42 page

ZXLD1371

Document number: DS35436 Rev. 1 - 2

35 of 42

www.diodes.com

February 2012

A Product Line of

Diodes Incorporated

Applications Information (cont.)

Figure 14. Thermal Feedback Network

The thermistor resistance, RT, at a temperature of T degrees Kelvin is given by

RT= RR e

Where

RR is the thermistor resistance at the reference temperature, TR

TR is the reference temperature, in Kelvin, normally 273 + 25 = 298K (25°C)

B is the “beta” value of the thermistor.

For example,

Temperature threshold Tthreshold = 273 + 70 = 343K (70˚C)

TH1 = 10k

Ω at 25˚C and B = 3900

RT = 1.8kΩ @ 70˚C

Rth = RT at Tthreshold = 1.8kΩ

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.

ZXLD1371EST16TC bảng dữ liệu(PDF) 35 Page - Diodes Incorporated