PAH100S TDK Corporation, PAH100S Datasheet - Page 36

• Manufacturer Part Number: PAH100S
• Manufacturer: TDK Corporation

PAH
B-178
PAH
●Output Voltage Adjustment by external resistor or
(1) In case of adjusting output voltage lower
(2) In case of adjusting output voltage higher
by variable resistor
(1-1) Available maximum output current = rated output
(1-2) Connect an external resistor Radj (down) between
(1-3) Equation of external resistor and output voltage.
Below graph is relation Δ(%) and value of external resistor.
(2-1) Allowable maximum output current = maximum
(2-2) Connect an external resistor Radj (up) between
(2-3) Equation of external resistor and output voltage
Below graph is relation Δ(%) and value of external resistor.
Fig.2-2 Connection for output voltage trim down
Radj (up)=
Fig.2-4 Connection for output voltage trim up
Power
module
300S24, 350S24
current
the TRM terminal and –S terminal.
Power
module
1.225×Δ% Δ%
output power ÷ output voltage (reduce maximum
output current in specification.)
TRM terminal and +S terminal.
Vo:
Radj(up): External adjustment resistor
Δ(%):
TRM
Fig.2-3 Δ(%) vs. Radj (down) (1)
＋V
−V
＋S
−S
TRM
〔
1000
＋V
−V
Radj (down)=
Radj (down) : Value of external resistor
Δ(%)
＋S
−S
100
0.1
10
1
0
Change in Output VoltageΔ (%)
Vo (100%+Δ%)
Nominal output value of module
Output voltage change rate against
nominal output voltage
10
: Output voltage change rate against
〔
Radj (down)
nominal output voltage
Radj (up)
20
100%
Δ%
−
30
100%+2×Δ%
−2
40
〕
[kΩ]
＋
−
Load
＋
Load
−
〕
[kΩ]
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
capacitors (C2, C3: film capacitor or ceramic capacitor
0.022μF) between output terminals and the nearest M3
threaded hole. Connect capacitors (C4: refer to table 1-1
for electrolytic capacitor values, C5: ceramic capacitor
0.1μF) at 50mm distance from the output terminals. Mea-
sure at ceramic capacitor (C5) terminals as shown in fig.
3-1 using coaxial cable with JEITA attachment. Use oscil-
loscope with 100MHz frequency bandwidth or equivalent.
Take note that output ripple voltage and output spike noise
may vary depending on PCB wiring design.
Generally, output ripple voltage and output spike noise can
be reduced by increasing capacitance value of external
capacitor.
4 Maximum Line Regulation
Maximum value of output voltage change when input volt-
age is gradually varied (steady state) within specified input
voltage range.
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.
Fig.3-1 Measurement of Maximum Output Ripple & Noise
＋V
＋S
−S
−V
50mm
Fig.2-5 Δ% vs. Radj (up) (2)
C3
C2
10000
C4
1000
100
10
+
0
・All specifications are subject to change without notice.
C5
Change in Output VoltageΔ (%)
R:50Ω
C:4700pF
JEITA Attachment
1.5m 50Ω
Coaxial Cable
10
As short as possible
Load
12V
28V
C
R
20
Oscilloscope