PTCEL Datasheet, PDF (2/5 Pages) Vishay Siliconix – PTC Thermistors, Inrush current limiter and Energy Load-Dump

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OUTLINE AND DIMENSIONS in millimeters
D
T
H3
H2
F
L1
d
PTCEL
Vishay BCcomponents
COMPONENT DIMENSIONS in millimeters
PTCEL13
PTCEL17
D
13 max.
17 max.
H1
17 max.
21 max.
H2
3±1
3±1
d
0.6 ± 0.06
0.8 ± 0.08
L1
20 min.
20 min.
F
5 ± 0.8
5 ± 0.8
T
7.0 max.
7.5 max.
REQUIRED NUMBER OF PTC THERMISTORS TO LIMIT CURRENT AND ABSORB ENERGY
By using several PTC’s in a series / parallel network, the maximum current limitation and absorbed energy levels can be further
optimized. For homogeneous current and energy distribution it is recommended to combine only PTCEL of the same size and
matched resistance value. Energy absorption per PTC in a network depends on current distribution in the network and as such
on the individual PTC resistance value. PTCEL thermistors might be used in a series connection to further lower the inrush
current, but not to increase the maximum allowed voltage levels. Following formula may be used to calculate the minimum
number of PTCEL thermistors required in a DC link or other capacitor bank application to properly charge or discharge a given
amount of energy without follow current:
N  -----------------------^C-------^x-----^V----²------------------------
2 x C_th x T_sw - T_amb
Notes
• N is the number of PTCEL required in the network.
• C is the total capacitor value to charge or discharge in F.
• V is the maximum DC voltage on the capacitor C.
• C_th is the thermal capacity of one PTC in [J/K] (see table).
• T_sw is the minimum switching temperature of the PTCEL (130 °C).
• T_amb is the maximum ambient temperature at which the PTC needs to operate.
Revision: 31-May-16
2
Document Number: 29165
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