UC3730 [TI]
Thermal Monitor; 温度监控
| 型号： | UC3730 |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | Thermal Monitor |
| 文件： | 总5页 (文件大小：287K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
UC1730
UC2730
UC3730
Thermal Monitor
FEATURES
DESCRIPTION
•
On-Chip Temperature Transducer
The UC1730 family of integrated circuit devices are designed to be used in
a number of thermal monitoring applications. Each IC combines a tempera-
ture transducer, precision reference, and temperature comparator allowing
the device to respond with a logic output if temperatures exceed a user pro-
grammed level. The reference on these devices is capable of supplying in
excess of 250mA of output current − by setting a level of power dissipation
the rise in die temperature will vary with airflow past the package, allowing
the IC to respond to airflow conditions
•
Temperature Comparator Gives
Threshold Temperature Alarm
•
•
•
•
Power Reference Permits Airflow
Diagnostics
Precision 2.5V Power Reference
Permits Airflow Diagnostics
These devices come in an 8-Pin DIP, plastic or ceramic, a 5-Pin TO-220 or a
PLCC-20 version. In the 8-Pin version, a PTAT (proportional to absolute
temperature) output reports die temperature directly. This output is config-
ured such that its output level can be easily scaled up with two external gain
resistors. A second PTAT source is internally referenced to the temperature
comparator. The other input to this comparator can then be externally pro-
grammed to set a temperature threshold. When this temperature threshold
is exceeded an alarm delay output is activated. Following the activation of
the delay output, a separate open collector output is turned on. The delay
pin can be programmed with an external RC to provide a time separation
between activation of the delay pin and the alarm pin, permitting shutdown
diagnostics in applications where the open collector outputs of multiple parts
are wire OR’ed together.
Transducer Output is Easily Scaled
for Increased Sensitivity
Low 2.5mA Quiescent Current
The 5-Pin version in the TO-220 package is well suited for monitoring
heatsink temperatures. Enhanced airflow sensitivities can be obtained with
this package by mounting the device to a small heatsink in the airstream.
This version of the device does not include the PTAT output or the open col-
lector alarm output.
BLOCK DIAGRAM
Pin numbers shown for 8-Pin DIP, ( ) number for 5-Pin TO-220.
10/94
UC1730
UC2730
UC3730
ABSOLUTE MAXIMUM RATINGS
Input Supply Voltage, (+VIN). . . . . . . . . . . . . . . . . . . . . . . 40V
Alarm Output Voltage (8-Pin Version Only) . . . . . . . . . . . 40V
Alarm Delay Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10V
Alarm Threshold Set Voltage . . . . . . . . . . . . . . . . . . . . . . 10V
2.5V Reference Output Current . . . . . . . . . . . . . . . . . -400 mA
Alarm Output Current (8-Pin Version Only) . . . . . . . . . . 0 mA
Power Dissipation at TA = 25°C (Note 2) . . . . . . . . . 1000 mW
Power Dissipation at TC = 25°C (Note 2). . . . . . . . . 2000 mW
Thermal Resistance Junction to Ambient
T, 5-Pin Plastic DIP TO-220 . . . . . . . . . . . . . . . . . . . . 65°C/W
Thermal Resistance Junction to Case
N, 8-Pin Plastic DIP. . . . . . . . . . . . . . . . . . . . . . . . . . . 60°C/W
J, 8-Pin Ceramic DIP. . . . . . . . . . . . . . . . . . . . . . . . . . 40°C/W
T, 5-Pin Plastic TO-220. . . . . . . . . . . . . . . . . . . . . . . . . 5°C/W
Operating Junction Temperature . . . . . . . . . -55°C to +150°C
Storage Temperature . . . . . . . . . . . . . . . . . . -65°C to +150°C
Lead Temperature (Soldering, 10 Seconds). . . . . . . . . 300°C
Note 1: Voltages are referenced to ground. Currents are posi-
tive into, negative out of, the specified terminals.
N, 8-Pin Plastic DIP . . . . . . . . . . . . . . . . . . . . . . . . . 110°C/W
J, 8-Pin Ceramic DIP . . . . . . . . . . . . . . . . . . . . . . . . 110°C/W
Note 2: Consult Packaging section of Databook for thermal
limitations and considerations of package.
CONNECTION DIAGRAMS
DIL-8 (TOP VIEW)
N or J Package
PLCC-20 (TOP VIEW)
Q Package
PACKAGE PIN FUNCTION
FUNCTION
PIN
1-3
4
N/C
ALARM DELAY
ALARM OUTPUT
+VIN
5
6
GND
7
N/C
PTAT+
8-13
14
15
16
17
18
5-PIN TO-220 (TOP VIEW)
T Package
PTAT-
2.5V REFERENCE
2.5V REFERENCE
ALARM
THRESHOLD SET
N/C
19-20
Unless otherwise stated, these specifications apply for TJ = 0°C to +100°C for the
UC3730, -25°C to + 100°C for the UC2730 and -55°C to +125°C for the UC1730,
+VIN = + 5V, and PTAT– = 0V. TA = TJ.
ELECTRICAL CHARACTERISTICS:
PARAMETERS
INPUT SUPPLY
TEST CONDITIONS
MIN
TYP
MAX UNITS
Supply Current
+VIN = 35V
2.8
2.3
4.0
3.5
mA
mA
+VIN = 5V
REFERENCE
Output Voltage
TJ = 25°C
2.475
2.46
2.5
2.525
2.54
25
V
Over Temperature
IOUT = 0 to 250mA
+VIN = 5 to 25V
V
Load Regulation
8.0
1.0
mV
mV
Line Regulation
5.0
TEMPERATURE COMPARATOR
Temperature Comparator Threshold at 300°K (26.85°C), Nominally 5mV/°K,
VINPUT High to Low
1.475 1.50 1.525
V
Temperature Error
-10
10
°C
%/V
°C
Threshold Line Regulation
Temperature Linearity
Threshold Hysteresis
Input Bias Current
+VIN = 5 to 25V
Note 2
0.005 0.02
2.0
8.0
5.0
15
3.0
-0.5
1.2
mV
µA
mA
V
VINPUT at 1.5V
VOUT = 1V
-0.1
3.0
Max Output Current
Output Sat Voltage
IOUT = 100µA
0.05
0.25
2
UC1730
UC2730
UC3730
Unless otherwise stated, these specifications apply for TJ = 0°C to +100°C for the UC3730,
-25°C to + 100°C for the UC2730 and -55°C to +125°C for the UC1730, +VIN = + 5V, and
PTAT– = 0V. TA = TJ.
ELECTRICAL
CHARACTERISTICS (cont):
PARAMETERS
TEST CONDITIONS
MIN
TYP
MAX UNIT
TEMPERATURE COMPARATOR (cont.)
Output Leakage Current
VOUT = 1V
0.01
1.0
µA
PTAT BUFFER (8-Pin N, or J Version Only)
Output Voltage
at 300°K (26.85°C), Nominally 5mV/°K
In 10X Config. + VIN = 25V
1.460 1.50
1.54
15.4
12
V
V
14.6
-12
15
Temperature Error
°C
°C
%/V
mV
V
Temperature Linearity (Note 2)
Line Regulation
2.0
0.02
1.0
5.0
+VIN = 5 to 25V
IOUT = 0 to 2mA
PTAT + TO +VIN
0.04
3.0
Load Regulation
Dropout Voltage
1.9
2.5
Input Bias Current at PTAT– Input
-3.0
1.1
-1.0
µA
ALARM BUFFER COMPARATOR (8-Pin N, or J Version Only)
Threshold Voltage (VTH)
Threshold Hysteresis Voltage
Input Bias Current
Alarm Delay Input Low to High
Alarm Delay Voltage > VTH
Alarm Delay Voltage < VTH
VOUT = 1V
1.2
100
0.1
15
1.3
250
0.5
V
mV
µA
mA
V
Max Output Current
Output Sat Voltage
7.0
IOUT = 3mA
0.25
0.1
0.45
2.0
Output Leakage
VOUT = 35V
µA
Note 2: This parameter is guaranteed by design and is not tested in production.
APPLICATIONS AND OPERATION INFORMATION
Scaling the PTAT Output (8 Pin Version Only)
R2
R1
VOUT = 5 x 1+
mV⁄ ° K
(Recommended Range for R1 is 2k to 4k)
VREF Maximum Output Current vs Input Supply
Junction Temperature Rise vs Airflow UC3730N (8-
Pin Plastic Dip)
3
UC1730
UC2730
UC3730
APPLICATIONS AND OPERATION INFORMATION (Cont.)
Setting a Temperature Threshold
Temperature Threshold (°C)
2.5V
0.005
R2
R1+R2
=
x
)
− 273.15
(
Note:For airflow monitoring a power dissipation
level can be set with a resistive load, RL, on the
reference output. PD = (+ VIN - 2.5V)2/RL.
Dual Speed Fan Control
2.5V
0.005
R2
R1+R2
RX
R1+RX
R3
TH(°C) =
TL(°C) =
x
− 273.15
− 273.15
2.5V
0.005
x
Where: RX = R2 ×
R2 + R3
UNITRODE INTEGRATED CIRCUITS
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4
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