TDK-Lambda PH Series Manual Download Page 47

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300S, 600S

B-345

・All specifications are subject to change without notice.

C2, C3: 4700pF

Use a ceramic capacitor that has high withstand voltage to
reduce the output spike voltage.

48VDC Input： 1.5kVAC or above

280VDC Input： 3kVAC or above

Select the capacitor from the above recommended compo-
nents with high withstand voltage because the test voltage
is applied to the capacitor during the withstand voltage
test in some application contents.
Connect C2 bVin and baseplate and C3 between
-Vin and baseplate as short as possible.

C4: 2.2μF

Also, use a ceramic capacitor to reduce the output noise
voltage.
Attach the ceramic capacitor bV and -V where
less than 50mm from output terminal for PH300S.
For PH600S, attach the ceramic capacitor between +V
and -V terminal as short as possible.
The output spike noise voltage could be changed for de-
sign of printed circuit board.

C5:

Use electrolytic capacitor(s) for stable operation.
Attach the electrolytic capacitor bV and -V where
less than 50mm from output terminal for PH300S.
For PH600S, attach the electrolytic capacitor bV
and -V terminals as short as possible. Recommend tighten
the screws of load wire and C5 together.
Oscillation waveform could be shown at dropping down the
output for characteristics of equivalent series resistance
(ESR) of electrolytic capacitor and equivalent series induc-
tance (ESL).
Moreover, note the output ripple voltage could be changed
for design of printed circuit board.
In case input/output dynamically changes, it helps the fluc-
tuation of output voltage by increasing the external capaci-
tor value.

3.3V

12V

15V

24V

28V

48V

300S

600S

6.3V

4700μF

10000μF

10V

3900μF

4700μF

25V

1000μF

2200μF

25V

1000μF

2200μF

35V

560μF

1000μF

50V

470μF

820μF

50V

*1 470μF × 2

*1 680μF × 2

*1 For 48V output model, use two 50V capacitors in series that

have low impedance.

Table1-2 C5: Recommended Values of External Output

Capacitor

Remarks:

1. Use an electrolytic capacitor that has excellent low imped-

ance for temperature characteristic.
(Equivalent electrolytic capacitor in LXY series manufac-
tured by Nippon Chemicon)

2. Be aware of ripple current allowance of the electrolytic ca-

pacitor. Especially be aware it when the load current is in
dynamics.

The output voltage may be greatly varied in 300Hz - 2kHz
frequency range at 0%←→100% of dynamic load condition.
For less dynamic of the voltage, use a electrolytic capacitor
which has better capacity than recommended electrolytic
capacitor or keep the minimum load current more than 10%
of nominal current.
Contact us for the details.

C6:

In between input source and input line of PH300S, 600S
series there are a switch and connectors etc. In case that
the switch is on/off or plug in/off when the input is apply-
ing, attach an electrolytic capacitor, C6 as shown as Fig-
ure1-3.
Because in-rush current flows when the input is applied,
confirm I

t for the switch and fuse.

　Recommended Values

48VDC Input : 100 - 470μF

280VDC Input : 10 - 47μF

Fuse

Switch

＋

＋Vin

−Vin

Baseplate

Figure1-3 Input Filter with Input Switch

If plural numbers of module will be connected in PH300S,
PH600S series, attach an electrolytic capacitor, C6 as
shown as Figure1-4.