LTC4098-1 datasheet(25/32 Pages) LINER

25 / 32 page

LTC4098/LTC4098-1

40981fb

rHOT = Ratio of RNTC|HOT to R25

RNOM = Primary thermistor bias resistor (see Figure 9a)

R1 = Optional temperature range adjustment resistor

(see Figure 9b)

The trip points for the LTC4098/LTC4098-1’s temperature

qualiﬁcation are internally programmed at 0.349 • NTCBIAS

for the hot threshold and 0.765 • NTCBIAS for the cold

threshold.

Therefore, the hot trip point is set when:

NTCBIAS

NTCHOT

NOM

NTCHOT

•.

•

= 0 349

and the cold trip point is set when:

NTCBIAS

NTCBI

NTC COLD

NOM

NTC COLD

•.

•

= 0 765

adjustment resistor, both the upper and the lower tempera-

ture trip points can be independently programmed with

the constraint that the difference between the upper and

lower temperature thresholds cannot decrease. Examples

of each technique are given below.

NTC thermistors have temperature characteristics which

are indicated on-resistance temperature conversion tables.

The Vishay-Dale thermistor NTHS0603N011-N1003F, used

in the following examples, has a nominal value of 100k

and follows the Vishay curve 1 resistance-temperature

characteristic.

In the explanation below, the following notation is used.

R25 = Value of the thermistor at 25°C

RNTC|COLD = Value of thermistor at the cold trip point

RNTC|HOT = Value of thermistor at the hot trip point

rCOLD = Ratio of RNTC|COLD to R25

–

RNOM

100k

RNTC

100k

NTC

0.1V

NTC_ENABLE

40981 F09a

LTC4098/LTC4098-1

NTC BLOCK

TOO_COLD

TOO_HOT

0.765 • NTCBIAS

0.349 • NTCBIAS

–

NTCBIAS

–

RNOM

105k

RNTC

100k

12.7k

NTC

0.1V

NTC_ENABLE

40981 F09b

TOO_COLD

TOO_HOT

0.765 • NTCBIAS

0.349 • NTCBIAS

–

LTC4098/LTC4098-1

NTC BLOCK

NTCBIAS

(9a)

(9b)

Figure 9. NTC Circuits

APPLICATIONS INFORMATION

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