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參數(shù)資料
| 型號(hào)： | AS273D1LPA |
| 元件分類： | 模擬信號(hào)調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PBCY3 |
| 封裝： | TO-92, 3 PIN |
| 文件頁(yè)數(shù)： | 3/12頁(yè) |
| 文件大小： | 84K |
| 代理商： | AS273D1LPA |
11
ASTEC Semiconductor
AS273
Over-Temperature Detector
Adjustable Hysteresis Temperature
Detector
The hysteresis of the AS273 can be increased by
reprogramming the device to a lower tempera-
ture set point upon over-temp. A higher tempera-
ture is set by R1. When the temperature exceeds
the high-temp set point, the open collector output
is turned on and allows R2 to rob current from the
reference pin and resets the AS273 to the low-
temp set point. As a result, the hysteresis esca-
lates by the difference between the high-temp
and the low-temp set points.
Three-State Temperature Sensor
In the Three-State Temperature Sensor shown in
Figure 16, a low-temp trip point is selected by R1
and a high-temp trip point is selected by the two-
transistor latch. When the temperature is below
the low-temp set point, V
OUT is in the high state
(V
OUT = 5.0 V). When the temperature exceeds
the low-temp set point, the two-transistor latch is
set and V
OUT is pulled low (VOUT = 2.5 V). The
latch also supplies extra current to the reference
pin to reset the IC to sense a higher temperature.
Once the high-temp is reached, the output will
turn on (V
OUT = 0.2 V). This circuit is highly use-
ful in applications where a stand-by, a warning
and a shut-down state are required.
Figure 15.
Figure 16.
V
CC
R2
R1
V
OUT
REF
OUT
GND
AS273
V
CC
+5 V
R1
2.4 k
REF
OUT
GND
AS273
R2
1 k
R3
1.5 k
R5
2 k
R4
470
R6
500
+
V
O
C1
1
F
Stand-by State:
Warning State:
Shut-down State:
T < T1, T2
T1 < T < T2
T1, T2 < T
V
O = 5.0 V
V
O = 2.5 V
V
O = 0.2 V
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