6
TDK-Lambda
PFE300SA
･
500SA Series
INSTRUCTION MANUAL
C14: Refer to Table 5-1
To reduce output ripple noise voltage, connect electrolytic capacitors V and –V.
Connect C14 as close as possible to the +V and -V output terminals of this power module.
Table 5-1
C14 : Recommended output external capacitance
C15: 2.2uF(Ceramic Capacitor)
Connect chip ceramic capacitor at 50mm from the output terV and -V of the power module to
reduce output spike noise.
Also, note that output spike voltage may vary depending on the wiring pattern of the printed circuit board.
C16 : Refer to Table 5-2
Connect C16 at 50mm from the output terV and -V of the power module to stabilize operation.
Note that the output ripple and line turn off characteristics of the power module might be affected by the
ESR and ESL of the electrolytic capacitor.
Also, note that output ripple voltage may vary depending on the wiring pattern of the printed circuit board.
Sudden change in output voltage due to sudden load change or sudden input voltage change can be reduced
by increasing external output capacitance value.
Table 5-2
C16 : Recommended output external capacitance
Note)
1. Use low-impedance electrolytic capacitors with excellent temperature characteristics.
(Nihon Chemi-con LXY Series or equivalent)
(Nichicon PM Series or equivalent)
2. For module operation at ambient temperature -20
℃
or less, output ripple voltage might be
affected by ESR characteristics of the electrolytic capacitors. Increase the capacitance values
shown in Table 5-1 and 5-2 according to the table below.
Table 5-3 C14,C16 : Recommended output external capacitance(Ambient Temperature
≦
-20
℃
)
3. Take note of the maximum allowable ripple current of the electrolytic capacitor used. Especially,
for sudden load current changes, verify actual ripple current and make sure that allowable
maximum ripple current is not be exceeded.
For connection other than recommended capacitance, be sure to verify characteristics by actual evaluation.
