PAH300
･
350S24
-SERIES
4
TDK-Lambda
■
Explanations on Specifications
1. Input Voltage Range
Input voltage range for PAH300
･
350S24 Series is
indicated below.
Input Voltage Range : 18
～
36VDC
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 : 2Vp-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.
Fig.1-1 Input Ripple Voltage
●
Basic Connection
-Vin
+Vin
CNT
CASE
C1
C4
C3
C2
C5
+
-
Load
50mm
+
Fuse
+
+V
+S
-S
-V
POWER
MODULE
TRM
M3 threaded hole
M3 threaded hole
Fig.1-2 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:
PAH300S24 : 30A
PAH350S24 : 40A
C1:
To prevent the effect of input line inductance to the
power module, connect electrolytic capacitor or
ceramic capacitor bVin 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 normally 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 : 220
μ
F
×
2pcs and
above (Parallel connect)
(Voltage Rating 50V and above)
Notes
1. Use low impedance electrolytic capacitor with
excellent temperature characteristics.
(Nippon Chemi-con LXY 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 C1 value more than the value indicated above.
3. When ambient temperature becomes lower than
–20
℃
, connect 4 more and above capacitors indicated
above in parallel to reduce ESR.
C2, C3 : 0.022
μ
F
To reduce spike noise voltage at the output, connect
film capacitors or ceramic capacitors between +V and
the nearest M3 threaded hole and between
–
V and the
nearest M3 threaded hole.
Also, take note that output spike noise voltage could
vary according to PCB (printed circuit board) wiring
design.
However, for cases where baseplate is connected to +V
or –V, use the nearest M3 threaded hole. (M3 threaded
t
Time
In
pu
t V
ol
ta
g
e
Vrpl
below 2V
Input Voltage
Range
