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B59217J0130A020

P1-P3P4-P6P7-P9P10-P12P13-P13
Calculation of the number of required PTC elements
Number of required PTC elements (connected in parallel) as function of capacitance and charging
voltage of smoothing or DC link capacitor:
K K factor
K = 1 for DC source
K = 0.96 for 3-phase bridge rectifier
K = 0.76 for single phase bridge rectifier
N Number of required PTC thermistors connected in parallel
C Capacitance of smoothing or DC link capacitor in F
V Charging voltage of capacitor in V
C
th
Heat capacity in J/K
T
ref
Reference temperature of PTC in °C
T
A,max
Expected maximum ambient temperature in °C
In case of large N values the resulting resistance of the parallel PTC network might be too low for
effective limitation of the charging current. In this case a combination of series and parallel
connected PTC thermistors can be used.
Inrush current limiters
PTC thermistors in housing
Page 4 of 13Please read Cautions and warnings and
Important notes at the end of this document.
Reliability data
Test Standard Test conditions ∆R
25
/R
25
Electrical endurance,
cycling
Room temperature, V
link,max
applied energy < C
th
(T
ref
T
A
)
Number of cycles: 100 000
< 25%
Electrical endurance,
constant
IEC 60738-1 Storage at V
max
and T
op,max
(@ V
max
)
Test duration: 1000 h
< 25%
Damp heat IEC 60738-1 Temperature of air: 40 °C
Relative humidity of air: 93%
Duration: 56 days
Test according to IEC 60068-2-78
< 10%
Rapid change
of temperature
IEC 60738-1 T
1
= T
op,min
(0 V), T
2
= T
op,max
(0 V)
Number of cycles: 5
Test duration: 30 min
Test according to IEC 60068-2-14, test Na
< 10%
Vibration IEC 60738-1 Frequency range: 10 to 55 Hz
Displacement amplitude: 0.75 mm
Test duration: 3 × 2 h
Test according to IEC 60068-2-6, test Fc
< 5%
Climatic sequence IEC 60738-1 Dry heat: T = T
op,max
(0 V)
Test duration: 16 h
Damp heat first cycle
Cold: T = T
op,min
(0 V)
Test duration: 2 h
Damp heat 5 cycles
Tests performed according to
IEC 60068-2-30
< 10%
Inrush current limiters
PTC thermistors in housing
Page 5 of 13Please read Cautions and warnings and
Important notes at the end of this document.
Characteristics
Minimum resistance of PTC thermistors
versus applied voltage (pulsed)
PTC resistance R
PTC
versus
PTC temperature T
PTC
(measured at low signal voltage)
Switching time t
S
versus switching current I
S
(measured at 25 °C in still air)
Residual current in high-ohmic state I
res
as
function of applied voltage V
PTC
, typical
(measured at 25 °C in still air)
Inrush current limiters
PTC thermistors in housing
Page 6 of 13Please read Cautions and warnings and
Important notes at the end of this document.
P1-P3P4-P6P7-P9P10-P12P13-P13

B59217J0130A020

Mfr. #:
Buy B59217J0130A020
Manufacturer:
EPCOS / TDK
Description:
HOUSED PTC THERMISTORS AS ICL, 4
Lifecycle:
New from this manufacturer.
Delivery:
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