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TMP300AIDCKR データシート(PDF) 7 Page - Texas Instruments

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部品番号 TMP300AIDCKR
部品情報  Resistor-Programmable Temperature Switch
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メーカー  TI1 [Texas Instruments]
ホームページ  http://www.ti.com
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TMP300AIDCKR データシート(HTML) 7 Page - Texas Instruments

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R
INT
210kW
R
SET
T
SET
OUT
V+
HYST
SET
V
TEMP
TMP300
3 A
m
Proportional
toT
A
Open-DrainControl
Voltagesource
totesttrippoint.
R
ink
=
W
SET
10(50+T
)
SET
3
R
=
SET
(T
0.01+0.5)
´
SET
3e-
6
TMP300
www.ti.com
SBOS335D – JUNE 2005 – REVISED JANUARY 2016
6 Detailed Description
6.1 Overview
The TMP300 is a thermal sensor designed for over-temperature protection circuits in electronic 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 provides the temperature reading.
6.2 Feature Description
6.2.1 Calculating RSET
The set resistor (RSET) provides a threshold voltage for the comparator input. The TMP300 trips when the VTEMP
pin exceeds the TSET voltage. The value of the set resistor is determined by the analog output function and the
3
μA internal bias current.
To set the TMP300 to trip at a preset value, calculate the RSET resistor value according to Equation 1 or
Equation 2:
where
TSET is in °C; or
(1)
where
TSET is in °C.
(2)
6.2.2 Using VTEMP to Trip the Digital Output
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
Copyright © 2005–2016, Texas Instruments Incorporated
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Product Folder Links: TMP300


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