PAQ
-S48
PAQ
B-238
・All specifications are subject to change without notice.
1 Input Voltage Range
Input Voltage Range for PAQ-S48 Series is indicated
below.
Input Voltage Range: 36-76VDC
Basically, ripple voltage (Vrpl) which results from
rectification 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: 4Vp-p
When this value is exceeded, the output ripple voltage
becomes 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.
Time
Input Voltage
Vrpl
below 4V
Input Voltage
Range
Fig.1-1 Input Ripple Voltage
TRM
CNT
Load
＋
−
-Vin
+Vin
+S
-S
-V
+V
Fuse
C3
C1
C2
50mm
+
+
Fig.1-2 Basic Connection
Input Fuse
PAQ-S48 Series module is not internally fused. To ensure
safe operation and to receive each Safety Standards
approval, please connect an external fuse (fast-blow type)
as shown in Fig.1-2.
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.
Recommended input fuse current rating:
PAQ100S48: 6.3A
PAQ50S48: 5A
C1: 1μF, C2: 10μF
To reduce spike noise voltage at the output, connect
1μF ceramic capacitor and 10μF electrolytic capacitor
or tantalum 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.
Maximum capacitance that can be connected bV
and –V, is total 10,000μF.
C3:
Input capacitor C3 is recommended to stabilize the module
when the module is powered from a high impedance
source.
Select the electrolytic capacitor with low ESR and
sufficient allowable ripple current.
Verify actual ripple current value by actual measurement.
Recommended capacitor value: 33μF and above
（voltage rating 100V or above）
Note)
1. Use low impedance electrolytic capacitor
with excellent temperature characteristics.
(Nippon Chemicon LXV Series or equivalent)
2. When input line inductance becomes excessively
high due to insertion of choke coil operation of
the power module could become unstable. For
this case, increase C3 value more than the value
indicated above.
3. When ambient temperature becomes lower than
–20℃, connect two capacitors indicate above in
parallel.
C4：
When switches or connectors are used between input
source and PAQ-S48 Series input terminals, impulse surge
voltage is generated due to input throw-in by switch on/off
or due to inserting/removing of power module from the
active line. For this case, connect an additional electrolytic
capacitor C4 as shown in fig.1-3 and fig.1-4.
Recommended Capacitor: 33μF and above
（Voltage Rating 100V or above）
Also, in-rush current flows at line throw-in.
Therefore, be sure to verify capability of switch or fuse to
withstand I
2
t at line throw-in.
Fuse
−Vin
＋Vin
C3
+
C4
+
Switch
Fig.1-3 Input filter (C4) with Switch
Fuse
−Vin
＋Vin
C3
+
C4
+
Switch
Fuse
C3
+
−Vin
＋Vin
Fig.1-4 Input Filter with Switch when Plural Power
2. Explanation on Specifications
Содержание PAQ100S48-1R2
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