DESCRIPTION
The UC1730 family of integrated circuit devices are designed to be used in
a number of thermal monitoring applications. Each IC combines a temperature transducer, precision reference, and temperature comparator allowing
the device to respond with a logic output if temperatures exceed a user programmed level. The refe rence on these devices is capable of supplying in
excess of 250mA of output current − by setting a level of p ower dissipation
the rise in die temperature will vary with airflow past the package, allowing
the IC to respond to airflow conditions
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 tempe rature directly. This output is configured such that its output level can be easily scaled up with two external gain
resistors. A second PTAT source is internal ly refere nced to the temperature
comparator. The other input to this comparator can then be externally programmed 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 separa te open colle ctor output is turn ed 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, p ermitting shutdown
diagnostics in applications where the open collector outputs of multiple parts
are wire OR’ed together .
The 5-Pin version in the TO-220 package is well suited for monitoring
heatsink temperatures. Enha nced airfl ow sensiti vities can be obtained with
this package by mou nting the device to a small heatsink in the airstream.
This version of the device does not include the PTAT output or the open collector alarm output.
查询UC1730供应商
Thermal Monitor
FEATURES
• On-Chip Temperature Trans ducer
• Temperature Comparator Gives
Threshold Temperature Alarm
• Power Reference Permits Airf low
Diagnostics
• Precision 2.5V Power Reference
Permits Airflow Diagnostics
• Transducer Output is Easily Scaled
for Increased Sensitivity
• Low 2.5mA Quiescent Current
UC1730
UC2730
UC3730
BLOCK DIAGRA M
10/94
Pin numbers shown for 8-Pin DIP, ( ) number for 5-Pin TO -22 0.
UC1730
UC2730
UC3730
ABSOLUTE MAXI MUM RATING S
Unless otherw ise stat ed, these sp ecif icat io ns 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.
Input Supply Voltage, (+VIN). . . . . . . . . . . . . . . . . . . . . . . 40V
Alarm Output Voltag e (8-Pin Vers ion Only). . . . . . . . . . . 40V
Alarm Delay Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10V
Alarm Threshold Set Voltage . . . . . . . . . . . . . . . . . . . . . . 10V
2.5V Reference Output Current . . . . . . . . . . . . . . . . . -400 mA
Alarm Output Current (8-Pin Vers io n Only) . . . . . . . . . . 0 mA
Power Dissipation at T
Power Dissipation at T
A = 25 °C (Not e 2) . . . . . . . . . 1000 mW
C = 25°C (Note 2). . . . . . . . . 2000 m W
Therma l Resis ta nce Ju nct ion to Amb ie nt
N, 8-Pin Plastic DI P . . . . . . . . . . . . . . . . . . . . . . . . . 110°C/W
J, 8-Pin Ceramic DIP . . . . . . . . . . . . . . . . . . . . . . . . 110°C/W
CONNECTION DIAGRAMS
DIL-8 (TOP VIEW)
N or J Package
5-PIN TO-220 (TOP VIEW)
T Package
T, 5-Pin Plastic DIP TO- 220 . . . . . . . . . . . . . . . . . . . . 65°C/W
Thermal Resis tance Ju nct ion to Case
N, 8-Pin Plastic DIP. . . . . . . . . . . . . . . . . . . . . . . . . . . 60°C/W
J, 8-Pin Ceramic DIP. . . . . . . . . . . . . . . . . . . . . . . . . . 40°C/W
T, 5-Pin Plastic TO-22 0. . . . . . . . . . . . . . . . . . . . . . . . . 5°C/W
Operating Junct ion Te mp era tu re . . . . . . . . . -55°C to +150°C
Storage Temperature . . . . . . . . . . . . . . . . . . -65°C to +150°C
Lead Tempera tu re (Solderin g, 10 Seconds). . . . . . . . . 300°C
Note 1: Voltage s are refer ence d to grou nd. Current s are positive into, negative out of, the specified terminals.
Note 2: Consult Packaging sectio n of Data book for therma l
limitations and con sider atio ns of pack age.
PLCC-20 (TOP VIEW)
Q Package
PACKAGE PIN FUNCTION
FUNCTION PIN
N/C 1-3
ALARM DELAY 4
ALARM OUTPUT 5
+V
IN 6
GND 7
N/C 8-13
PTAT+ 14
PTAT- 15
2.5V REFERENCE 16
2.5V REFERENCE 17
ALARM
THRESHOLD SET
N/C 19-20
18
ELECTRICAL CHARACTERISTICS:
PARAMETERS TEST CONDITIONS MIN TYP MAX UNITS
INPUT SUPPLY
Supply Current +V
REFERENCE
Output Volt age TJ = 25°C 2.475 2.5 2.525 V
Load Regulation I
Line Regulatio n +V
TEMPERATURE COMPARATOR
Temperature Com par at or Thre shold at 300°K (26.85°C), Nominally 5m V/ °K,
Tempe rature Error -10 10 °C
Threshold Line Regula tion +V
Temperature Linea rity Note 2 2.0 5.0 °C
Threshold Hyst eresis 3.0 8.0 15 mV
Input Bias Cur rent V
Max Output Current VOUT = 1V 1.2 3.0 mA
Output Sat Voltage I
IN = 35V 2.8 4.0 mA
+V
IN = 5V 2.3 3.5 mA
Over Temperature 2.46 2.54 V
OUT = 0 to 250mA 8.0 25 mV
IN = 5 to 25V 1.0 5.0 mV
V
INPUT High to Low
IN = 5 to 25V 0.005 0 .0 2 %/V
INPUT at 1.5V -0.5 -0.1 µA
OUT = 100µA 0.05 0.25 V
2
1.475 1.50 1.525 V
ELECTRICAL
V
OUT
= 5 x
1
+
R2
R1
mV
⁄
°
K
(Recommende d Range for R1 is 2k to 4k)
CHARACTERISTICS (con t):
Unless otherwise stated , thes e specificat ions 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 , +V
PTAT– = 0V. T
A = TJ.
IN = + 5V, a n d
PARAMETERS TEST CONDITIONS MIN TYP MAX UNIT
TEMPERATURE COMPARATOR (cont.)
Output Lea kage Current V
OUT = 1V 0.01 1.0 µA
PTAT BUFFER (8-Pin N, or J Version Onl y)
Output Voltage at 300°K (26.85°C), Nominally 5mV/ ° K 1.460 1.50 1.54 V
In 10X Config. + V
IN = 25V 14.6 15 15.4 V
Tempe rature Error -12 12 °C
Temperature Linea rity (Not e 2) 2.0 5.0 °C
Line Regulatio n +V
Load Regulation I
IN = 5 to 25V 0.02 0.04 %/V
OUT = 0 to 2mA 1. 0 3.0 mV
Dropout Voltage PTAT + TO +VIN 1.9 2.5 V
Input Bias Curren t at PTAT– Input -3.0 -1.0 µA
ALARM BUFFER COMPARATOR (8-Pin N, or J Version Only)
Threshold Volta ge (V
TH) Alarm Delay Input Low to High 1.1 1.2 1.3 V
Threshold Hyster esis Volt age Alarm Delay Voltage > VTH 100 250 mV
Input Bias Curren t Alarm Delay Voltage < VTH 0.1 0.5 µA
Max Output Current V
OUT = 1V 7.0 15 mA
Output Sat Voltage IOUT = 3mA 0.25 0.45 V
Output Lea kage V
OUT = 35V 0.1 2.0 µA
Note 2: This parameter is guara nt eed by design an d is not tes ted in product ion.
UC1730
UC2730
UC3730
APPLICATIONS AND OPERATION INFORMATION
Scaling the PTAT Output (8 Pin Version Only)
VREF Maximum Output Current vs Input Supply Junction Temperature Rise vs Airflow UC3730N (8-
Pin Plastic Dip)
3
APPLICATIONS AND OPERATION INFORMATION (Cont.)
TH(°C) =
2.5V
0.005
x
R2
R1+R2
−
273.15
TL(°C) =
2.5V
0.005
x
R
X
R1+R
X
−
273.15
Where: RX = R2
×
R3
R2
+
R3
Setting a Temperature Threshold
Temperature Thresh old (°C)
2.5V
=
(
0.00 5
R2
x
)
R1
+
R2
− 273.15
UC1730
UC2730
UC3730
Dual Speed Fan Control
Note:For airflow monitoring a power dissipation
L
level can be set with a re sist ive lo ad, R
reference output. P
D
= (+ V
IN
- 2.5V)2/RL.
, on the
UNITRODE INTEGRATED CIRCUITS
7 CONTINENTAL BLVD. •• MERRIMACK, NH 03054
TEL. (603) 424-2410 •• FAX (603) 424-3460
4
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