ZXLD1371Q

ZXLD1371Q

Document number: DS37116 Rev. 1 - 2

34 of 42

www.diodes.com

September 2015

© Diodes Incorporated

ZXLD1371Q

Figure 14 Thermal Feedback Network

T

e

B

1

T

-

1

T

Where

B is the “beta” value of the thermistor.

For example,

1)

70˚C

2)

TH1 10kΩ at +25˚C and B

900

1. kΩ @ +70˚C

3)

1. kΩ

Over-Temperature Shutdown

The ZXLD1371Q 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.

85

˚C

70

˚C

100%

10%

Thermal network response in Buck configuration with:

Rth = 1.8k

Ω and TH1=10kΩ (beta =3900)

REF

TADJ

Rth

TH1