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LM57-Q1 数据表(PDF) 29 Page - Texas Instruments

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部件名 LM57-Q1
功能描述  Resistor-Programmable Temperature Switch and Analog Temperature Sensor
Download  38 Pages
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

LM57-Q1 数据表(HTML) 29 Page - Texas Instruments

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J
A
JA
DD Q
DD
TEMP
L
7  7 5
 9
,  9
±9
,
T
ª
º
¬
¼
GND
SENSE1
SENSE2
VTEMP
TOVER
VIA to ground plane
VIA to power plane
VDD
TRIP TEST
TOVER
0.1 µ F
RSENSE1
RSENSE2
LM57-Q1
www.ti.com
SNIS191A – JULY 2015 – REVISED JULY 2015
10.2 Layout Example
Figure 25. PW (TSSOP) Package Layout Example
10.3 Temperature Considerations
The junction temperature of the LM57-Q1 is the actual temperature being measured. The thermal resistance
junction-to-ambient (RθJA) is the parameter (from ) used to calculate the rise of a device junction temperature due
to its power dissipation. Equation 3 is used to calculate the rise in the die temperature of the LM57-Q1.
where
TA is the ambient temperature.
IQ is the quiescent current.
IL is the load current on VTEMP.
RθJA can be found in
(3)
For example using an LM57-Q1 in the PW (TSSOP) package, in an application where TA = 30°C, VDD = 5.5 V,
IDD = 28 μA, J5 gain, VTEMP = 2368 mV, and IL = 0 μA, the total temperature rise would be [183°C/W × 5.5 V × 28
μA] = 0.028°C. To minimize self-heating, the load current on VTEMP should be minimized.
Copyright © 2015, Texas Instruments Incorporated
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