PAF600F280-28 TDK Corporation, PAF600F280-28 Datasheet - Page 17

• 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 PAF500F24 Series is indicated be-
low.
Input Voltage Range:
PAF500F24-12: 19 - 36VDC
PAF500F24-28: 18 - 36VDC
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.
Allowable input ripple voltage: 2Vp-p
When this value is exceeded, the output ripple voltage be-
comes large.
Note that abrupt input voltage change could cause the out-
put voltage to fluctuate excessively.
Also, input voltage waveform peak value for high and low
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.
Furthermore, fuse must be connected to the +Vin side if
–Vin side is used as ground, or fuse must be connected to
–Vin side if +Vin side is used as a ground.
Input Fuse recommended current rating: 50A
v
500F24
Fuse
Fig.1-2 Basic Connection
Fig.1-1 Ripple Voltage
R1
＋
C1
Baseplate
＋Vin
−Vin
＋ON/OFF
−ON/OFF
Time
2. Explanations on Specifications
TRIM
AUX
IOG
＋S
＋V
−V
−S
Vrpl
below 2V
PC
50mm
C2
Input Voltage
Range
＋
C3
t
Load
＋
−
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: 560μF×2 pcs and above
Note) 1. Use low impedance electrolytic capacitor with excel-
2. When input line inductance becomes excessively high
3. When ambient temperature becomes lower than
C2: 10μF
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.
C3:
For stable operation, connect an electrolytic capacitor be-
tween +V and –V within 50mm distance from the output
terminals.
Take note that output ripple and output shutdown could be
affected by electrolytic capacitor, equivalent impedance
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.
Table1-1 C3 ：Recommended Values of External
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.
–20 ℃ , connect 4 more and above capacitors indi-
cated above in parallel to reduce ESR.
lent temperature characteristics.
(Nippon Chemicon LXY Series or equivalent)
＊1
Vout
12V
28V
parallel connect
(voltage rating 50V and above)
Output Capacitor
25V 470μF × 2（＊ 1）
50V 220μF × 2（＊ 1）
C3
( parallel connect)
B-109
PAF