TC620CVOA [TELCOM]
5V, DUAL TRIP POINT TEMPERATURE SENSORS; 5V ，双跳变点温度传感器
| 型号： | TC620CVOA |
| 厂家： | 
TELCOM SEMICONDUCTOR, INC |
| 描述： | 5V, DUAL TRIP POINT TEMPERATURE SENSORS |
| 文件： | 总6页 (文件大小：77K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
2
TC620
TC621
5V, DUAL TRIP POINT TEMPERATURE SENSORS
FEATURES
GENERAL DESCRIPTION
■ User-Programmable Hysteresis and Temperature
Set Point
■ Easily Programs with 2 External Resistors
■ Wide Temperature Detection
Range................ – 40°C to +125°C (TC620/621CVx)
■ External Thermistor for Remote Sensing
Applications (TC621x)
The TC620 and TC621 are programmable logic output
temperature detectors designed for use in thermal manage-
ment applications. The TC620 features an on-board tem-
perature sensor, while the TC621 connects to an external
NTC thermistor for remote sensing applications.
Both devices feature dual thermal interrupt outputs
(HIGH LIMIT and LOW LIMIT), each of which program with
a single external resistor. On the TC620, these outputs are
driven active (high) when measured temperature equals the
user-programmed limits. The CONTROL (hysteresis) out-
put is driven high when temperature equals the high limit
setting, and returns low when temperature falls below the
low limit setting. This output can be used to provide simple
ON/OFF control to a cooling fan or heater. The TC621
provides the same output functions except that the logical
states are inverted.
APPLICATIONS
■ Power Supply Overtemperature Detection
■ Consumer Equipment
■ Temperature Regulators
■ CPU Thermal Protection
ORDERING INFORMATION
Ambient
The TC620/621 are usable over a maximum tempera-
ture range of – 40°C to +125°C.
Part No.
Package
Temperature
TC620x*COA
TC620x*CPA
TC620x*EOA
TC620x*EPA
TC620CVOA
TC621x*COA
TC621x*CPA
8-Pin SOIC
8-Pin Plastic DIP
8-Pin SOIC
8-Pin Plastic DIP – 40°C to +85°C
8-Pin SOIC
0°C to +70°C
0°C to +70°C
– 40°C to +85°C
Ambient
Temperature
Part No.
Package
TC621x*EOA
TC621x*EPA
8-Pin SOIC
8-Pin Plastic DIP
– 40°C to +85°C
– 40°C to +85°C
– 40°C to +125°C
0°C to +70°C
8-Pin SOIC
8-Pin Plastic DIP
*The part code will be C or H (see Functional Block Diagram, below,
and page 2).
0°C to +70°C
FUNCTIONAL BLOCK DIAGRAM
VDD
VDD
8
4
8
Temp
to
Voltage
Thermistor
Interface
Circuit
1
THERMISTOR
4
TC620
TC621
Converter
+
–
+
7
7
HIGH LIMIT
LOW LIMIT
2
VREF
GEN
2
VREF
GEN
HIGH SET
–
LOW SET
VREF
VREF
+
–
+
–
6
5
6
5
LOW LIMIT
CONTROL*
HIGH LIMIT
CONTROL*
3
3
VREF
GEN
VREF
GEN
HIGH SET
LOW SET
R
Q
S
R
Q
S
Q
Q
*Suffix code "C" denotes cooling option (high true CONTROL output);
suffix code "H" denotes heating option (low true CONTROL output).
TC620/1-9 11/4/96
TELCOM SEMICONDUCTOR, INC.
2-15
5V, DUAL TRIP POINT
TEMPERATURE SENSORS
TC620
TC621
Maximum Chip Temperature................................. +150°C
Storage Temperature ............................ – 65°C to +150°C
Lead Temperature (Soldering, 10 sec) ................. +300°C
ABSOLUTE MAXIMUM RATINGS*
Package Power Dissipation (TA ≤ 70°C)
PDIP ...............................................................730mW
SOIC ...............................................................470mW
Derating Factors
Plastic ............................................................8mW/°C
Supply Voltage ............................................................20V
Input Voltage Any Input....... (GND – 0.3V) to (VDD +0.3V)
Operating Temperature
*Static-sensitive device. Unused devices must be stored in conductive
material. Protect devices from static discharge and static fields. Stresses
above those listed under "Absolute Maximum Ratings" may cause perma-
nent damage to the device. These are stress ratings only and functional
operation of the device at these or any other conditions above those
indicated in the operation sections of the specifications is not implied.
Exposuretoabsolutemaximumratingconditionsforextendedperiodsmay
affect device reliability.
M Version .......................................– 55°C to +125°C
V Version ........................................– 40°C to +125°C
E Version .......................................... – 40°C to +85°C
C Version ............................................... 0°C to +70°C
ELECTRICAL CHARACTERISTICS: TA = 25°C, unless otherwise specified.
Parameter
Conditions
Min
Typ
Max
Unit
Supply Voltage Range
Supply Current
4.5
—
—
270
400
—
18
400
1000
1
V
5V ≤ VDD ≤ 18V
µA
Ω
Output Resistance
Output Current
Output High or Low, 5V ≤ VDD ≤ 18V
Temp Sensed Source/Sink
—
—
mA
mA
°C
Output Current
Cool/Heat
Source/Sink
—
—
1
Absolute Accuracy
T = Programmed Temperature
T – 3
T
T + 3
PIN CONFIGURATIONS (DIP and SOIC)
VDD
NC
LOW SET
HIGH SET
GND
1
2
3
4
8
7
6
5
VDD
8
1
2
3
4
NC
LOW SET
HIGH SET
GND
LOW LIMIT
HIGH LIMIT
LOW LIMIT
HIGH LIMIT
7
6
5
TC620xCOA
TC620xEOA
TC620CVOA
TC620xCPA
TC620xEPA
CONTROL
CONTROL
VDD
1
2
3
4
8
7
6
5
NC
HIGH SET
LOW SET
GND
NC
HIGH SET
LOW SET
GND
8
1
2
3
4
VDD
HIGH LIMIT
HIGH LIMIT
7
6
5
TC621xCOA
TC621xEOA
LOW LIMIT
CONTROL
TC621xCPA
TC621xEPA
LOW LIMIT
CONTROL
2-16
TELCOM SEMICONDUCTOR, INC.
5V, DUAL TRIP POINT
TEMPERATURE SENSORS
2
TC620
TC621
Care must be taken to ensure the LOW SET program-
mingresistorisasmallervaluethantheHIGHSETprogram-
ming resistor. Failure to do this will result in erroneous
operation of the CONTROL output.
Care must also be taken to ensure the LOW SET
temperature setting is at least 5°C lower than the HIGH SET
temperature setting. That is:
DETAILED DESCRIPTION
The TC620/621 consists of a positive temperature coef-
ficient (PTC) temperature sensor, and a dual threshold
detector. Temperature setpoint programming is easily ac-
complished with external programming resistors from the
HIGH SET and LOW SET inputs to VDD. The HIGH LIMIT
and LOW LIMIT outputs remain low as long as measured
temperature is below setpoint values. As measured tem-
perature increases, the LOW LIMIT output is driven high
when temperature equals the LOW SET setpoint (±3°C
max). If temperature continues to climb, the HIGH LIMIT
output is driven high when temperature equals the HIGH
SET setpoint (Figure 1). The CONTROL (hysteresis) output
is latched in its active state at the temperature specified by
theHIGHSETresistor. CONTROLismaintainedactiveuntil
temperature falls to the value specified by the LOW SET
resistor.
LOW SET ≤ HIGH SET – 5°C
The nomograph of Figure 2 can help the user obtain an
estimate of the external resistor values required for the
desired LOW SET and HIGH SET trip points.
250
200
150
100
50
HIGH SET POINT
TEMPERATURE
LOW SET POINT
LOW LIMIT OUTPUT
HIGH LIMIT OUTPUT
-55
-35
-15
5
25
45
65
85
105
125
TEMPERATURE (°C)
Figure 2. TC620 Sense Resistors vs. Trip Temperature
CONTROL OUTPUT (COOL OPTION)
CONTROL OUTPUT (HEAT OPTION)
Built-in Hysteresis
To prevent output "chattering" when measured tem-
peratureisat(ornear)theprogrammedtrippointvalues, the
LOW SET and HIGH SET inputs each have built-in hyster-
esis of – 2°C below the programmed settings (Figure 3).
Figure 1: TC620/621 Input vs. Output Logic
Programming The TC620
The resistor values to achieve the desired trip-point
temperatures on HIGH SET and LOW SET are calculated
using EQUATION 1 below:
SET POINT
(SET POINT – 2°C)
RTRIP = 0.5997 x T 2.1312
Where: Rtrip = Programming resistor in Ohms
T
= The desired trip point temperature
in degrees Kelvin
HIGH LIMIT
or LOW LIMIT
Output
Equation 1.
For example, a 50°C setting on either the HIGH SET or
LOW SET input is calculated using Equation 1 as follows:
Figure 3: Built-in Hysteresis on Low Limit and High Limit Outputs
As shown, the outputs remain in their active state
(hysteresis) until temperature falls an additional 2°C below
the user's setting.
Rset = 0.5997 x ((50 + 273.15)2.1312) = 133.6k Ω
TELCOM SEMICONDUCTOR, INC.
2-17
5V, DUAL TRIP POINT
TEMPERATURE SENSORS
TC620
TC621
Using The TC621
APPLICATIONS
The TC621 operation is identical to that of the TC620,
but requires an external NTC thermistor. Use the resistance
versus temperature curve of the thermistor to determine the
values of the programming resistors. Note that the pin
numbers for the HIGH SET and LOW SET programming
resistors for the TC621 are reversed versus that of the
TC620 (i.e. the resistor value on HIGH SET [pin 2] should
always be lower than the one connected to LOW SET [pin
3]). Also note that the outputs of the TC621 are LOW TRUE
when used with an NTC thermistor.
Dual Speed Temperature Control
The Dual Speed Temperature Control uses a TC620
anda TC4469quaddriver.Twoofthedriversareconfigured
in a simple oscillator. When the temperature is below the
LOW TEMP set point, the output of the driver is OFF. When
the temperature exceeds the LOW TEMP set point, the
TC4469 gates the oscillator signal to the outputs of the
driver. This square wave signal modulates the remaining
outputs and drives the motor at a low speed. If this speed
cannot keep the temperature below the HIGH TEMP set
point, then the driver turns on continuously which increases
the fan speed to high. The TC620 will monitor the tempera-
ture and only allow the fan to operate when needed, and at
the required speed to maintain the desired temperature. A
higher power option can be designed by adding a resistor
and a power MOSFET.
TC621 Thermistor Selection
The TC621 uses an external thermistor to monitor the
controllingtemperature.Athermistorwitharesistancevalue
of approximately 100kΩ at 25°C is recommended.
A temperature setpoint is selected by picking a resistor
whosevalueisequaltotheresistanceofthethermistoratthe
desiredtemperature. Forexample, a30kΩ resistorbetween
HIGH TEMP (pin 2) and VDD (pin 8) sets the high tempera-
ture trip point at +51°C and a 49kΩ resistor on LOW TEMP
(pin 3) sets the low temperature trip point to +41°C.
Temperature Controlled Fan
In this application, a high and a low temperature is
selected by two ‘set’ resistors. The TC620 monitors the
ambient temperature and turns the FET switch on when the
temperature exceeds the HIGH TEMP set point. The fan
remains on until the temperature decreases to the LOW
TEMP set point. This provides the hysteresis. In this appli-
cation, the fan turns on only when required.
TC620/621 Outputs
Both devices have complimentary output stages. They
are rated at a source or sink current of 1mA maximum.
The TC621 uses an external thermistor to monitor the
ambient temperature. This adds one part, but allows more
flexibility in location of the sensor.
TYPICAL NTC THERMISTOR
350
300
250
200
150
100
50
0
0
10
20
30
40
50
70
60
TEMPERATURE (°C)
Figure 4. Typical Thermistor Resistance vs. Temperature
2-18
TELCOM SEMICONDUCTOR, INC.
5V, DUAL TRIP POINT
TEMPERATURE SENSORS
2
TC620
TC621
+12V
14
V
MOTOR
0.1 µF
10 µF
1M
FAN MOTOR
LOW TEMP
8
°
30 C
1N4148
1N4148
100k
2
3
1
5
6
7
2
1
3
5
8
13
4
MOSFET
50Ω
50 pF
6
HIGH TEMP
TC620
4
°
9
50 C
TC4469
HIGHER POWER OPTION
FAN MOTOR
10
11
12
TEMPERATURE SCALE
°
°
0 C – 30 C (FAN OFF)
7
1 µF
10k
°
°
30 C – 50 C (FAN LOW)
°
50 C – UP (FAN HIGH)
Figure 5.
+12V
+12V
THERMISTOR
(NTC)
FAN MOTOR
FAN MOTOR
MTP3055E
1
8
1
2
3
4
8
7
6
5
LOW TEMP
HIGH TEMP
LOW TEMP
2
7
6
5
3
TC620
TC621
MTP3055E
HIGH TEMP
4
Figure 6.
4.5V TO 18V
HIGH
TEMP
LOW
TEMP
1
2
3
4
8
7
6
1
14
1k
1k
2
3
4
5
6
7
13
12
11
10
9
TC620
5
TC4469
HIGH
TEMP
LOW
TEMP
WARNING
WARNING
8
HEATING/COOLING
EQUIPMENT
Figure 7. TC620 Heating/Cooling Application
TELCOM SEMICONDUCTOR, INC.
2-19
5V, DUAL TRIP POINT
TEMPERATURE SENSORS
TC620
TC621
4.5V TO 18V
HIGH
LOW
TEMP
TEMP
1
2
3
4
8
7
6
5
1
2
3
4
5
6
7
14
13
12
11
10
9
1k
1k
TC620
TC4469
HIGH
TEMP
WARNING
LOW
TEMP
WARNING
8
HEATING/COOLING
EQUIPMENT
Figure 8. TC620 Heating/Cooling Application
2-20
TELCOM SEMICONDUCTOR, INC.
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