TMP300BIDBVT datasheet(6/18 Pages) TI1

6 / 18 page

SET

0.01+0.5)

SET

-6

ink

SET

10(50+T

)

SET

INT

210kW

SET

OUT

V+

HYST

SET

TEMP

TMP300

3 A

Proportional

toT

Open-DrainControl

Voltagesource

totesttrippoint.

TMP300

SBOS335C – JUNE 2005 – REVISED JANUARY 2011

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APPLICATIONS INFORMATION

To set the TMP300 to trip at a preset value, calculate

The TMP300 is a thermal sensor designed for

the RSET resistor value according to Equation 1 or

over-temperature

protection

circuits

electronic

Equation 2:

systems. The TMP300 uses a set resistor to program

the trip temperature of the digital output. An additional

high-impedance

(210k

Ω)

analog

voltage

output

(1)

provides the temperature reading.

Where TSET is in °C; or

CALCULATING RSET

The set resistor (RSET) provides a threshold voltage

(2)

for the comparator input. The TMP300 trips when the

Where TSET is in °C.

VTEMP pin exceeds the TSET voltage. The value of the

set resistor is determined by the analog output

USING VTEMP TO TRIP THE DIGITAL OUTPUT

function and the 3mA internal bias current.

The analog voltage output can also serve as a

voltage input that forces a trip of the digital output to

simulate a thermal event. This simulation facilitates

easy system design and test of thermal safety

circuits, as shown in Figure 8.

Figure 8. Applying Voltage to Trip Digital Output

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