PAF600F280-28 TDK Corporation, PAF600F280-28 Datasheet - Page 45

• Manufacturer Part Number: PAF600F280-28
• Description: 28V@21.5A
• Manufacturer: TDK Corporation

・All specifications are subject to change without notice.
PAF
1 Input Voltage Range
Input voltage range for PAF450F280 and PAF600F280
Series is indicated below.
Basically， ripple voltage (Vrpl) which results from rectifica-
tion and filtering of commercial AC line is included within
the input voltage as shown in Fig.1-1. Ripple voltage must
be limited within the voltage described below.
When this value is exceeded, the output ripple voltage be-
comes large.
Note that sudden input voltage change may cause variation
of output voltage transitionally.
Also, input voltage waveform peak value must not exceed
above input voltage range.
● Basic Connection
Input Fuse
This power module has no built-in fuse. Use external fuse
to acquire various Safety Standards and to improve safety.
Also, use fast-blow type for every module.
C1 :
To prevent the effect of input line inductance to the power
module, connect electrolytic capacitor or ceramic capaci-
tor between +Vin and –Vin terminals.
Furthermore, use electrolytic capacitor with small ESR
value. Especially take note that during line turn off at low
ambient temperature, power module output will not nor-
mally shut down due to unstable C1 voltage.
Also, ripple current flows across this capacitor. Therefore,
verify maximum allowable ripple current this capacitor
when selecting component. Verify actual ripple current
value by actual measurement.
Recommended capacitor value: 22μF and above
Fuse
Input fuse recommended current rating: 6.3A
C2
C3
450F280, 600F280
Allowable input ripple voltage: 20Vp-p
Input voltage range: 200 - 400VDC
＋
C1
Fig.1-2 Basic Connection
Baseplate
Fig.1-1 Ripple Voltage
＋Vin
−Vin
CNT
SG
2. Explanations on Specifications
Time
(voltage rating 400V and above)
TRIM
AUX
IOG
＋S
＋V
−V
−S
PC
50mm以下
Vrpl
below 20V
C4
C5
C6
Input Voltage
Range
＋
C7
t
Load
＋
(400VDC)
−
Note) 1. Use low impedance electrolytic capacitor with excellent
C2, C3 : 330pF
To reduce spike noise voltage at the output, connect the
high withstand voltage ceramic capacitor from +Vin termi-
nal, –Vin terminal to the baseplate.
Note) 1. Connect the C2 between +Vin terminal and baseplate,
C4, C5: 0.022μF
To reduce spike noise voltage at the output, connect a ce-
ramic capacitor.
Connect the C4 between +V terminal and baseplate, and
the C5 between –V terminal and baseplate with the short
connections as possible.
C6: 2.2μF
To reduce spike noise voltage at the output, connect a ce-
ramic capacitor between +V and –V within 50mm distance
from the output terminals.
Also, take note that output spike noise voltage could vary
according to PCB wiring design.
C7:
For stable operation, connect an electrolytic capacitor be-
tween +V and –V at 50mm distance from the output termi-
nals.
Take note that output ripple and output fall characteristics
could be affected by electrolytic capacitor, equivalent im-
pedance and inductance characteristics of wiring.
Take note that output ripple voltage could vary according
to PCB wiring design.
For cases of abrupt changes in load current or input volt-
age, increasing capacitance value of the external capaci-
tors could reduce the voltage fluctuation.
Withstand voltage of C4, C5: 500VDC and above
Table1-1 C7: Recommended Values of External
2. When input line inductance becomes excessively high
3. When ambient temperature becomes lower than –20℃ ,
Withstand Voltage of C2,C3: 3kVac and above
2. There are cases where output ripple voltage could vary
temperature characteristics.
due to insertion of choke coil, operation of the power
module could become unstable. For this case, increase
C1 value more than the value indicated above.
connect four capacitors indicated above in parallel be-
cause output fall characteristics could be affected by
ESR.
and the C3 between –Vin terminal and baseplate with
the short connections as possible.
according to input wiring method or peripheral circuits.
For this case, increase C2 and C3 value or connect
common mode choke coil before C1.
Vout
12V
24V
28V
48V
Output Capacitor
25V 1,000μF x 2 parallel
50V 1,000μF x 2 series
50V 820μF
50V 820μF
C7
B-137
PAF