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5.1
F1 External Input Fuse
PFH500 series module has no internal fuse. Use an external fuse to meet Safety Agency requirements.
PFH500 series modules were tested for safety agency certifications (UL, cUL, VDE, etc.) using 10A, 250Vac, Fast-Acting
line fuse. One Fast-Acting type fuse must be used for each PFH module.
When selecting a fuse, be aware the line inrush surge current will flow through the PFH module during initial line power
application (or line power switch in). Check the I
line fuse to make sure that the fuse will not blow, and/or the circuit breaker will not trip.
Recommended External Fuse：10A, 250V (Fast Acting)
Note: Select fuse based on rated voltage, rated current and surge current capability.
(1) Voltage Ratings
100VAC line: AC125V
200VAC line: AC250V
(2) Current Ratings
Rated current is determined by the maximum input current based on operating conditions and can be calculated by the
following formula:
Iin
Iin (max) :
Pout
Vin (min) :
PF
For Efficiency and Power Factor values, refer to separate document "PFH500F Series Evaluation Data".
5.2
C1 (1µF); C4 (1µF); C5 (2.2µF) Film Capacitor or Class X Safety Capacitor
These capacitors are connected across the lines to reduce differential mode interference. Since the X cap is connected
across the line and neutral, the current flowing through the cap can be high. When selecting X capacitor, be sure to check
the allowable maximum ripple current rating of this capacitor.
TDK-Lambda Americas recommends the customers to verify the actual ripple current flowing through each X capacitor by
measuring the current flow.
Connect C5 as close to the input terminals of PFH500 series power module [i.e. AC(L) and AC(N)] as possible.
Recommended Voltage Rating of X - Capacitors: 250VAC or greater
REV 2.8 (March 30, 2020)
Pout
(max)
Vin
(min)
η
Maximum Input Current
:
Maximum Output Power
Minimum Input Voltage
:
Efficiency
:
Power Factor
2
t rating of the external power switch (or circuit breaker), and the external
(Arms)
PF
TDK-Lambda
PFH500-SERIES
INSTRUCTION MANUAL
(Formula 5-1)
10
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