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參數資料
| 型號： | LM27A |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 【3∑C Accurate, 120∑C-150∑C Factory Preset Thermostat (LM27 in Die Form) |
| 中文描述： | 【3ΣC準確，120ΣC-150ΣC工廠預設溫控器（LM27在模具中） |
| 文件頁數： | 1/10頁 |
| 文件大小： | 198K |
| 代理商： | LM27A |
July 2007
LM27A
±3°C Accurate, 120°C-150°C Factory Preset Thermostat
(LM27 in Die Form)
General Description
This datasheet applies to the LM27A, which is the die form of
the LM27. The LM27 is available in the SOT23-5 package.
Please refer to the LM27 datasheet for detailed specifications
pertaining to the packaged part.
The LM27A is a precision, single digital-output, low-power
thermostat comprised of an internal reference, DAC, temper-
ature sensor and comparator. Utilizing factory programming,
it can be manufactured with different trip points as well as
different digital output functionality. The trip point (T
) can
be preset at the factory to any temperature in the range of
+120°C to +150°C in 1°C increments. The LM27A has two
digital output pads, one digital input (HYST) and one analog
output (V
). One digitial output is an active-high, push-pull
output and the other is an active-low, open-drain output. Ei-
ther of the outputs (but not both) are available.
The LM27A is available in either an overtemperature shut-
down or an undertemperature shutdown option. An LM27A
with overtemperature shutdown is configured so that its ther-
mostat outputs (OS and OS) will go active when a rising
temperature crosses the trip point and the hysteresis will ap-
ply to a falling temperature. The thermostat outputs of an
LM27A with an undertemperature shutdown (US and US) will
trip on a falling temperature and hysteresis will apply on a
rising temperature. For example, when the LM27A is preset
as an overtemperature shutdown, the active-high output (OS)
will go HIGH and the active-low output (OS) will go LOW to
indicate that the die temperature is over the internally preset
T
OS
. The outputs will reset to their normal states when the
temperature goes below (T
–T
). Similarly, when pre-
programmed as an undertemperature shutdown the active-
high output (US) will go HIGH and the active-low output
(US) will go LOW to indicate that the temperature is below
T
US
. The outputs will reset when the temperature is above
(T
+T
). The typical hysteresis, T
, can be set to 2°C
or 10°C and is controlled by the state of the HYST pin. The
V
analog output provides a voltage that is proportional to
temperature and has a 10.7mV/°C output slope.
Standard parts are available, see ordering information for de-
tails. For other part options, contact a National Semiconductor
Distributor or Sales Representative for information on mini-
mum-order qualification.
Applications
■
Microprocessor Thermal Management
■
Appliances
■
Portable Battery Powered Systems
■
Fan Control
■
Industrial Process Control
■
HVAC Systems
■
Electronic System Protection
Features
■
Internal comparator with pin selectable 2°C or 10°C
hysteresis
■
No external components required
■
Open-drain or push-pull digital output; supports CMOS
logic levels
■
Internal temperature sensor with V
TEMP
output pin
■
V
TEMP
output allows after-assembly system testing
■
Internal voltage reference and DAC for trip-point setting
■
Excellent power supply noise rejection
■
AEC-Q100 Qualified
Key Specifications
■
Power Supply Voltage
■
Power Supply Current
2.7V to 5.5V
40μA(max)
15μA(typ)
■
Hysteresis Temperature
■
Temperature Trip Point Accuracy
2°C or 10°C(typ)
±3°C (max)
2007 National Semiconductor Corporation
201530
www.national.com
L
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