INSTRUCTION MANUAL
PFE500F
Series
TDK-Lambda
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C8, C9 : 1uF (Film Capacitor)
Ripple current flows through this capacitor. When selecting capacitor, be sure to check the allowable maximum
ripple current rating of this capacitor. Verify the actual ripple current flowing through this capacitor by doing
actual measurement.
Recommended Voltage Rating : 450VDC
Note) Select Capacitor with more than 3A (rms) rating. Connect C8, C9 as near as possible towards the
terminals of this power module.
C10, C11: 390uF (Electrolytic Capacitor)
Refer to “Selection Method of External Bulk Capacitor for Boost Voltage”.
Allowable
External
Capacitance
at nominal capacitor value is shown below.
Recommended Voltage Rating : 450VDC
Recommended Total Capacitor : 390uF to 1,200uF
Note) 1. Do not connect capacitors with more than the above capacitance value as this might result in power
module damage.
2. When using module between 390uF – 600uF for PFE500F Series total capacitor value, it is necessary
to reduce output power as shown in Fig1-3.
3. When using module below -20 deg C ambient temperature, AC ripple of boost voltage, output ripple
voltage and start up characteristics might be affected by ESR characteristics of the bulk capacitors.
Therefore, be sure to verify characteristics by actual evaluation.
C13, C14 : 0.033uF
Connect ceramic or film capacitor to conform to EMI/EMS standard and to reduce output spike noise voltage.
Note) High Voltage is applied across this capacitor during withstand voltage test depending on the application.
Connect C13, C14 as near as possible towards the terminals of this power module.
C15 : Refer to Table 1-1
To reduce output ripple voltage and to stabilize operation, connect electrolytic capacitors V and –V
terminals.
Note) Connect C15 as near as possible to the +V and -V terminals of this power module.
C16 : 2.2uF (Ceramic Capacitor)
Connect ceramic capacitor within 50mm from the output terV and -V of the power module to reduce
output spike noise voltage.
Also, note that output spike noise voltage might vary depending
on
the
wiring
pattern of the printed circuit
board.
8/21
12V
Vout
25V 1,000uF
C15
28V
50V 470uF
48V
100V 220uF
Table 1-1 C15:Recommended external capacitance
