C15; C16 - Output Electrolytic Capacitors - TDK-Lambda PFH500 Series Instruction Manual

5.11 C15; C16 – Output Electrolytic Capacitors
Connect C15 and C16 approximately 50mm from the output terminals Vo(+) and Vo(-) of the PFH Series power module to
stabilize the module operation. Note that the output noise ripple and the characteristics of the power module during input
line turn off might be affected by the ESR and ESL values of the selected electrolytic capacitors. Also, note that output
ripple voltage may vary depending on layout of the printed circuit board.
Changes in output voltage due to sudden load change or sudden input line voltage change can be reduced by increasing
external output capacitance value.
Table 5-1 Minimum External Output Capacitance for C15, C16
Module Output Voltage
28V
48V
12V
Note:
(1) Panasonic capacitors (EEUFC##### Series) were used during the testing process.
(2) Use low-impedance electrolytic capacitors with excellent temperature characteristics (Panasonic, Nippon Chemi-Con
LXY Series or Nichicon PM Series or equivalent rated at least 105 ºC).
(3) For module operation at ambient temperature below -20 ºC, the output ripple voltage will be affected by ESR
characteristics of the electrolytic capacitors. Therefore, output capacitance and ESR must be maintained at lower
operating temperatures.
(4) Take note of the maximum allowable ripple current of the electrolytic capacitor used. Considering sudden load current
changes, verify actual ripple current and make sure that allowable maximum ripple current of the external capacitor is
not being exceeded.
(5) If large output load steps are performed on the PFH module, it is recommended that the output capacitance be
increased, but not to exceed the maximum capacitance value. Refer to the Data Sheet.
REV 2.8 (March 30, 2020)
C15
220 µF, 50V
220 µF, 100V
1500 µF, 25V
INSTRUCTION MANUAL
C16
220 µF, 50V
220 µF, 100V
1500 µF, 25V
TDK-Lambda
PFH500-SERIES
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