PAH150S48-2.5 TDK Corporation, PAH150S48-2.5 Datasheet - Page 58

• Manufacturer Part Number: PAH150S48-2.5
• Manufacturer: TDK Corporation

]
40
PAH
40
B-200
PAH
3 Maximum Ripple and Noise
Measured value according to the specified methods based
on JEITA-9141 (Clause 7.12 and clause 7.13) which is de-
scribed in the following.
Connect according to fig.3-1 and measure. Connect ca-
pacitors (C2: refer to table 1-1 for ceramic capacitor val-
ues) at 50mm distance from the output terminals. Measure
at ceramic capacitor (C2) terminals as shown in fig. 3-1
using coaxial cable with JEITA attachment. Use oscillo-
scope with 100MHz frequency bandwidth or equivalent.
Take note that output ripple voltage and output spike noise
may vary depending on PCB wiring design.
Generally, increasing capacitance value of external ca-
pacitor can reduce output ripple voltage and output spike
noise.
4 Maximum Line Regulation
Maximum value of output voltage change when input volt-
age is gradually varied (steady state) within specified in-
putvoltage range.
Fig.3-1 Measurement of Maximum Output Ripple & Noise
(2-3) Equation of external resistor and output voltage
Module
Power
Radj （up） ＝
Vo
Radj(up) : external adjustment resistor
Δ (% )
10000
+V
+S
-S
-V
1000
450S48
Radj （up） ＝
100
Below graph is relation Δ(% ) and value of ex-
ternal resistor.
10
10000
1000
100
0
Fig.2-5 Δ(% ) vs. Radj(up) (2)
50mm
10
C ｈ ange in Output Voltage Δ （%）
C2
: nominal output value of module
: Output voltage change rate against
0
nominal output voltage
C ｈ ange in Output Voltage Δ （%）
Vo （ 100%+
1.225×
JEITA Attachment
Vo （ 100%+
Coaxial Cable
1.5m50Ω
1.225×
R：50Ω
C：4700pF
Δ
10
Δ
％
Δ
10
％）
Δ
％
％）
100%+2×
Load
+
-
R
100%+2×
As short as
C
Possible
Δ
Oscilloscope
Δ
％
％
20
Δ
20
Δ
％
％
[ ]
[ ]
kΩ
kΩ
5 Maximum Load Regulation
Maximum value of output voltage change when output
current is gradually varied (steady state) within specified
output current range.
When using at dynamic load mode, audible noise could be
heard from the power module and output voltage fluctua-
tion might increase. A thorough pre-evaluation must be
performed before using this power module.
6 Over Current Protection (OCP)
This power module has built-in OCP function.
Output will recover when short circuit or overload condi-
tions are released. OCP setting value is fixed and there-
fore, cannot be externally adjusted.
Also, take note that power module might be damaged con-
tinuing output short circuit or over load conditions depend-
ing on thermal conditions.
7 Over Voltage Protection (OVP)
This power module has built-in OVP function.
OVP set point is relative to the rated output voltage value.
OVP setting value is fixed and therefore, cannot be exter-
nally adjusted.
When OVP is triggered, output can be recovered by turn-
ing input line off and then turning it on again after lowering
the input voltage below the voltage value indicated below,
or by manual reset of the ON/OFF control terminal. Reset
time for ON/OFF control terminal is 100ms or longer.
When verifying OVP function by applying external voltage
at the output terminals, applied voltage value should not
exceed specified OVP maximum value. Refer to specifica-
tion table for OVP maximum value. Avoid applying external
voltage that exceeds OVP maximum value because this
will cause power module damage.
8 Over Temperature Protection (OTP)
This power module has built-in OTP function.
This function operates and shuts down the output when am-
bient temperature or internal temperature of power module
abnormally rises. OTP operates at 105℃ to 130℃ baseplate
temperature. OTP can be released when baseplate tem-
perature drops down approximately to within 80℃ to 95℃.
However, take note that OTP will operate again unless the
cause of abnormal heat of the power module is eliminated.
9 Remote Sensing (+S, -S terminal)
Remote sensing terminal is provided to compensate for
voltage drop across the wirings from the power module
output terminal to the load input terminal.
When remote sensing function is not used (local sensing),
short +S terminal to +V terminal and, -S terminal to -V terminal.
Take note that voltage compensation range for line drop
(voltage drop due to wiring) is determined such that out-
OVP release input voltage value : 10VDC and below
・All specifications are subject to change without notice.