ZPS11BX101A [NICHICON]
PTC Thermistor;
| 型号： | ZPS11BX101A |
| 厂家： | 
NICHICON CORPORATION |
| 描述： | PTC Thermistor |
| 文件： | 总7页 (文件大小：59K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
POSITIVE THERMISTORS "Posi-R"
APPLICATION GUIDELINES FOR POSITIVE THERMISTORS, "Posi-R"
General Observations
1. Do not use"Posi-R" in the presence of oil or water.The parts could fail.
2. Do not apply voltage in excess of the rated voltage
3. Do not use "Posi-R" with reactive gas,reducing gas, or oxygen-free environment
burn-out may occur.
.
This could cause a short circuit or burn-out.
-electrical characteristics may deteriorate or
Notes on Usage
1. Please use the parts within the rated operating temperatures according to the catalog.
2. Please use the parts wihtin the maximum operating voltage and maximum inrush current as specified in the catalog.
3. The surface temperatures for the "Posi-R" during operation are:
for overcurrent protection 100 to 160˚C
Please take into consideration the effect of generated heat around the "Posi-R"
4. Excessive press or shock (ex. drop) should not be applied to the "Posi-R".
5. Do not apply more lead stress than specified.
6. Do not allow flux to come in contact with "Posi-R", it may cause failure.
7. The outer resin on the leads may be partially peeled off. This will not affect the function of products.
8. In case of gluing "Posi-R", the outer resin may be come off, please contact us in this case.
Notes on Storage
1. Packaged parts should be stored under the following conditions:
temperature: –10 to +40˚C
humidity:85% or less
2. Storage of "Posi-R" devices may result in increased resistive characteristics. They will return to the initial value by applying
max. operating voltage prior to using the parts.
3. Shall be used shortly after opening the package. The prolonged exposure to the air may case to deteriorate the solderability.
CAT.8100B
POSITIVE THERMISTORS "Posi-R"
Characteristics of Positive Thermistors "Posi-R"
•
Switching Temperature (Resistance Anomaly Point)
At the resistance / temperature characteristics of positive thermistors "Posi-R", the temperature which the resistance value becomes
twice as high as that of at 25˚C, is called as "switching temperature" (Curie point)
Thermistors "Posi-R" show anomalous temperature characteristics of resistivity, and typical characteristics are represented in Fig. 1.
Optimum characteristics can be selected for each application.
•
Temperature Coefficient
The temperature coefficient is calculated from the linear range at the steepest portion of resistance (T
1
to T ) as illustrated in Fig. 2.
2
2.303 ( log10 R2 / R1)
×
Temperature coefficient =
100 (%/ ˚C)
t
2
– t
1
105
104
103
102
BL
CA
CE CJ CN
BT
10
1
10-1
–50
0
50
100
150
200
250
Temperature (˚C)
Fig. 1 Resistance / Temperature Characteristics
Maximum Inrush Current
The maximum inrush current is the maximum allowable current (effective value) flowed into a Posi-R. No current higher than this shall
be flowed as it causes breakdown of a Posi-R.
Recovery Time
The recovery time is the time constant necessary for a Posi-R to quickly return to the switching temperature (resistance of twice as high
as the initial value) after the power source is cut off.
Dissipation Factor
When a power source is applied to Posi-R and thermal equilibrium will have been reached, the following equation is established.
•
V
I = C (T1–T0)
Where,V : Applied voltage (V)
I : Equilibrium current (A)
C : Dissipation factor (
)
W/˚C
T1 : Equilibrium temperature of Posi-R (
)
˚C
T0 : Ambient temperature (
)
˚C
In case that the dissipation factor is known by putting arbitrary values of voltage and current into the above equation, the equilibrium
temperature at the then voltage can be attained.
The temperature rise (T1 –T0) of Posi-R due to voltage application can be also computed easily.
CAT.8100B
POSITIVE THERMISTORS "Posi-R"
R2
R1
t
2
T
1
t
1
T2
Temperature (˚C)
Fig. 2 Temperature Characteristics of "Posi-R"
•
Voltage / Current Characteristics
In the Fig. 3 circuit, the relationship between voltage and current is called as the voltage/current characteristics when the voltage is
applied to Posi-R and it gets the thermal equilibrium.
As seen in Fig. 4, the characteristic follows Ohm's law up to E1 point. The current increases when the voltage is raised, provided that
the temperature characteristics is within the range of switching temperature or lower. The range between E1 and E2 is over the
switching temperature but within the constant range of power dissipation. However, beyond E2 point, an excess power will run and
Posi-R will result in breakdown, accordingly.
Therefore, the operating voltage of Posi-R shall be lower than E2, and its rated voltage shall be defined to half of E2 value or lower,
taking the safety into account.
A
"Posi-R"
V
Fig. 3 Measuring Circuit
1
1
1
2
E1
E2
Voltage log10
E
Fig. 4 Voltage / Current Characteristics
CAT.8100B
POSITIVE THERMISTORS "Posi-R"
•
Equilibrium Current, Equilibrium Resistance
The current, which Posi-R gets thermal equilibrium with an arbitrary voltage application (
), is called as the
for 30 seconds or longer
equilibrium current.
Besides, the quotient which the applied voltage is divided by the equilibrium current is specified as the equilibrium resistance.
•
Current , Time Characteristics
In the Fig. 5 circuit, when a load resistance ( ) and a Posi-R are connected in series and an arbitrary voltage higher than E1 in Fig. 4 is
R
applied, the Posi-R will have inherent temperature due to a current flowing through it. Its temperature rises as time passes by, and it
exceeds the switching temperature in a certain time, resulting in a rapid damp of the current. The trip time can be adjusted by the
current volume as shown in Fig. 6.
By making use of these characteristics, a Posi-R can be used for the following applications;
1. Timing circuit
2. Switching use for motor starting
3. Overcurrent protection
When the parameters of
I
1
, t
1
, I
2
and t in Fig. 6 are expressed in a logarithmic graph in the manner of Fig. 7, an almost linear graph is
2
formed and the relationship between the circuit current and the trip time can be obtained.
But, when a Posi-R is used for a timing application such as a timer, the voltage shall be appropriately applied for 30 seconds or less
as the changes of conditions may affect much more as time passes by.
A
R
Fig. 5 Measuring Circuit
I
I
1
2
t
1
t2
Time
Fig. 6 Current / Time Characteristics
CAT.8100B
POSITIVE THERMISTORS "Posi-R"
Type numbering system
(
)
Example for overcurrent protection 12V. 2.2Ω
8
1
2
3
4
5
6
7
9
10
11
Z P C 1 1 C E 2 R 2 A
Revision Code
Nominal Resistance
Switching Temperature (Example)
Nominal resistance
0.5Ω
Code
Configuration
0R5
1R0
2R2
100
101
102
Temperature
150˚C
160˚C
190˚C
110˚C
120˚C
135˚C
Code
BL
1.0Ω
BN
BX
2.2Ω
10Ω
CC
CE
CH
100Ω
1kΩ
Usage
Type (Posi-R)
Application
Code
C
For overcurrent protection
Disc type
D
For square type temperature heater
For thermal sensing
S
P
For air conditioner
R
For refrigerator motor starting
Others Appliance
M
Z
CAT.8100B
POSITIVE THERMISTORS "Posi-R"
For Overcurrent Protection
When something abnormal occurs at the load such as a transistor circuit or a small-type motor, an abnormal current rushes into the
power source circuit. Then, a power transistor at the transformer or the switching power supply generates heat in an abnormal level
and causes breakdown.
If a Posi-R for overcurrent protection is used in such a circuit, it can make the temperature compensation and protection for the power
source and the load. An example is as shown in Fig. 8.
As to the temperature protection, it can be perfectly made in use of this Posi-R owing to the excellent characteristics of resistance
anomaly, that is, a current is reduced by the increased resistance due to the selfheating of Posi-R.
At the voltage/current characteristics in Fig. 9, there is a peak current. If a current larger than this peak current flows, a Posi-R acts.
But if a current less than the peak current flows, a Posi-R does not act. The peak current varies depending upon the size of Posi-R,
resistance and ambient temperature. Fig. 10 shows an example of current characteristics.
At the current higher than the upper limit of fluctuation range, a Posi-R acts. Contrary, at the current less than the lower limit, it does
not act. But the fluctuation range varies owing to ambient temperature.
For instance, if the operating temperature range is supposed to
value for a normal current (non-acting) and the upper limit at –10˚C becomes the minimum value for a limiting current (acting),
respectively.
maximum
be at –10 to +60˚C, the lower limit at 60˚C becomes the
+
Judging from the above explained relations, a Posi-R can be suited for the circuit where the ratio of a limiting current to a normal current
is more than 2.5 to 3 times.
Power source circuit (
Posi-R
)
Power source circuit (
)
Secondary
Primary
Posi-R
Load
Load
power
power source
source
Motor circuit
Posi-R
Transistor circuit
Posi-R
Load
Motor
M
power source
Fig. 8 Examples of applications
Characteristics of ZPC4MCE100D
1000
Peak current
500
–10˚C
25˚C
300
60˚C
200
100
50
1
2
3
5
10
20
Voltage (VAC)
Fig. 9 Voltage / Current Characteristics
CAT.8100B
POSITIVE THERMISTORS "Posi-R"
Characteristic of ZPC4MCE100D
600
Limiting current (Acting)
500
400
Fluctuation range
300
Normal current (Non-acting)
200
100
25˚C
60˚C
–10˚C
Ambient temperature
Fig. 10 Current Characteristics
104
103
102
10
1
0.1
0
50
100
150
200
Temperature (˚C)
Fig. 11 Resistance / Temperature Characteristics
CAT.8100B
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