PTCCL-30V Datasheet, PDF (3/6 Pages) Vishay Siliconix – 30 V to 60 V PTC Thermistors for Overload Protection

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PTCCL - 30 V / 60 V Series
Vishay BCcomponents
VOLTAGE DERATING AS A FUNCTION OF AMBIENT TEMPERATURE
120
100
80
60
40
20
0
-50 -25 0 25 50 75 100 125 150 175 200
T_amb (°C)
MAXIMUM OVERLOAD CURRENT I_{ol max.} DERATING AS A FUNCTION OF VOLTAGE
200
I_{ol max.}
(%)
150
100
80
0
40 50 70
100 120
150
V_rated (%)
I_max. as stated in the electrical data and ordering information tables, is the maximum overload current that may flow through the
PTC when passing from the low ohmic to high ohmic state at rated voltage.
When other PTC voltages are present after tripping, the I_max. value can be derived from the above I_max. as a function of voltage
graph. Voltages below V_rated will allow higher overload currents to pass the PTC.
TYPICAL TRIP-TIME AS A FUNCTION OF TRIP CURRENT RATIO
10²
t_s
Curve 1: Ø D_max. = 20.5 mm
Curve 2: Ø D_max. = 16.5 mm
10
Curve 3: Ø D_max. = 12.5 mm
Curve 4: Ø D_max. = 10.5 mm
Curve 5: Ø D_max. = 8.5 mm
1
Curve 6: Ø D_max. = 7.0 mm
(1)
(2)
(3)
Curve 7: Ø D_max. = 5.0 mm
(4)
(5)
Measured in accordance
10^-1
(6)
(7)
with “IEC 60 738”.
12
4
6
8
10
12
14 _It/Int 16
Trip-Time or Switching Time (t_s)
To check the trip-time for a specific PTC, refer to the Electrical Data and Ordering Information tables for the value Int. Divide the
overload or trip current by this I_nt and you realize the factor I_t/I_nt. This rule is valid for any ambient temperature between 0 °C
and 85 °C. Adapt the correct non-trip current with the appropriate curve in the Current Deviation as a Function of the Ambient
Temperature graph. The relationship between the I_t/I_nt factor and the switching time is a function of the PTC diameter; see the
above graphs.
Example
What will be the trip-time at I_ol = 3 A and T_amb = 0 °C of a thermistor type PTCCL09H471DBE; 2.5 Ω; Ø D_max. = 8.5 mm:
I_nt from the table: 470 mA at 25 °C
I_nt: 470 x 1.12 = 526 mA (at 0 °C)
Overload current = 3 A; factor I_t/I_nt: ³/_0.526 = 5.70. In the Typical trip-time as a function of trip current ratio graph, at the 8.5 mm
line and I_t/I_nt = 5.70, the typical trip-time is 1.7 s.
Revision: 21-Sep-15
3
Document Number: 29085
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