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參數(shù)資料
| 型號： | AS273D1LPA |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PBCY3 |
| 封裝： | TO-92, 3 PIN |
| 文件頁數(shù)： | 10/12頁 |
| 文件大小： | 84K |
| 代理商： | AS273D1LPA |
7
ASTEC Semiconductor
Theory of Operation
The AS273 is an over-temperature detector that
gives an over-temp signal when the device
junction temperature exceeds a programmed
over-temp threshold. Over-temp threshold pro-
gramming is accomplished by controlling the
magnitude of the reference shunt current.
Over-temperature Condition
Internal to the AS273 is a temperature sensor
which creates a voltage proportional to the
absolute temperature (PTAT) of the die. This
PTAT voltage is compared with a fraction of the
reference voltage corresponding to the over-
temperature threshold. When the PTAT voltage
exceeds the reference voltage, the comparator is
tripped and an over-temp signal is given to the
output. The output consists of an open collector
transistor that pulls low on an over-temp condi-
tion. Built into the comparator is temperature hys-
teresis, which keeps the over-temp signal until
the junction temperature has fallen 5C (or 10C)
below the over-temp threshold. Figure 9 shows
the output of the AS273 (with 10C of hysteresis)
over a range of junction temperature.
AS273
Over-Temperature Detector
Figure 9. Temperature Characteristic of Output with 10C of Hysteresis
5
0
I
REF = 4 mA
5
0
I
REF = 2 mA
5
0
I
REF = 1 mA
OT1
OT2
OT3
OT1-5
OT1-10
Output
Voltage,
V
Junction Temperature, T
J (°C)
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