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TB067

更新时间： 2024-02-05 17:19:56

品牌	Logo	应用领域
美国微芯 - MICROCHIP		传感器温度传感器
页数	文件大小	规格书
6页	146K
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Temperature Sensor Strategies Keep System Thermal Problems in Check

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TB067

Temperature Sensor Strategies Keep System Thermal

Problems in Check

OVER-TEMPERATURE SHUTDOWN

Author:

Microchip Technology Inc.

Heat sinking the high power dissipation devices in a

system is the simplest thermal management strategy.

In this case, only the system must be monitored for

catastrophic over-temperature conditions due to a

malfunction or excessive external ambient tempera-

ture. Temperature is sensed within the system

enclosure (internal system ambient) or at the heat sink

itself. When measured temperature exceeds a preset

limit, a fault is indicated and the system shuts down.

INTRODUCTION

Various concerns must be addressed when dealing

with temperature sensing applications, which fall into

two broad categories: precision temperature measure-

ment and system thermal management. Precision

temperature measurement applications (such as those

encountered in the process control industry) require

highly accurate temperature sensors. Applications of

this type frequently use a thermocouple (or higher

precision sensor) in concert with low offset/low drift

analog interface circuits to acquire and condition the

temperature signal with minimum error. Sensor

absolute accuracy and linearity are primary

considerations; sensor cost is a secondary issue.

Figure 1 illustrates a simple power supply over-temper-

ature shutdown circuit using Microchip’s TC622

temperature switch. This device integrates a solid-state

temperature sensor and user-programmable limit

detector in a single TO-220 package, allowing direct

attachment to the heat sink surface. The device

operates from power supply voltages between 4.5V

and 18.0V, and has both high true and low true logic

outputs (OUT, OUT). These outputs are driven active

when measured temperature equals (or exceeds) the

temperature setting determined by the value of external

System thermal management schemes, on the other

hand, regulate the creation (and/or disposal) of heat

within the system. Examples of system thermal man-

agement applications are CPU over-temperature

detectors in personal computers and thermal shutdown

circuits in power systems. The temperature sensor

must be accurate enough to detect when temperature

is approaching the upper boundry of the “safe” operat-

ing limit. Typically, full scale sensor measurement

errors of 2°C to 5°C are adequate for such applications.

The primary concerns in sensor selection are sensor

cost, size, and ease of interface to the processor.

programming resistor, R_SET. In the example of

Figure 1, the TC622 outputs are driven active when the

heatsink temperature equals the trip point temperature

set by R_SET. When this occurs, the crowbar circuit is

activated, causing the supply output to fold back to

zero. The TC622 outputs remain active until the heat-

sink temperature falls a minimum of 2°C (built-in

hysteresis) below the trip point temperature, at which

time the device again allows normal supply operation.

Heat Sink

Output Device

OUT

Output

Device

Power

Good

Signal

TC622

SET

TC622

Crowbar

Circuit

SET

OVERTEMP

Circuit Board

TC622 Heat Sink Mounting

OUT

GND

Heat Sink Surface

FIGURE 1:

TC622 Power Supply Over Temperature Shutdown

 2003 Microchip Technology Inc.

DS91067A-page 1

12 3 4 5 6

中文翻译

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与TB067相关器件

型号	品牌	获取价格	描述	数据表
TB0671A	TAI-SAW	获取价格	345MHz IF SAW Filter (BW=5 MHz)
TB0672A	TAI-SAW	获取价格	350MHz IF SAW Filter (BW=5 MHz)
TB0673A	TAI-SAW	获取价格	355MHz IF SAW Filter (BW=5 MHz)
TB0674A	TAI-SAW	获取价格	350MHz IF SAW Filter (BW=14 MHz)
TB0677A	TAI-SAW	获取价格	SAW Filter 300 MHz
TB0677B	TAI-SAW	获取价格	SAW Filter 300 MHz
TB0678A	TAI-SAW	获取价格	SAW Filter 750MHz SMD 3.8mm X 3.8mm
TB0681A	TAI-SAW	获取价格	IF SAW Filter 110MHz(BW=200KHz) SMD 9.1X7.1mm
TB0682A	TAI-SAW	获取价格	IF SAW Filter 130.06MHz(BW=160KHz) SMD 5.0X7.0mm
TB0691A	TAI-SAW	获取价格	SAW Filter 70MHz 1.3MHz BW (SMD 13.3×6.5 mm)

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