PAH75S48-5 TDK Corporation, PAH75S48-5 Datasheet - Page 37

• Manufacturer Part Number: PAH75S48-5
• Manufacturer: TDK Corporation

・All specifications are subject to change without notice.
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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, can not 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 CNT terminal. Reset time for
CNT 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
ambient temperature or internal temperature of power
module abnormally rises. OTP operates at 105℃ to 130℃
baseplate temperature. OTP can be released when base-
plate temperature 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-
put voltage at the output terminals is within output volt-
age range and that voltage between –V and –S terminals
is within 2V or less. Even for remote sensing case, use
power module such that output power is within specified
maximum output power.
Furthermore, reduce noise effect by using shield wire, twist
pair, or parallel pattern.
OVP release input voltage value: 3VDC and below
300S24, 350S24
Fig.9-1 Remote Sensing is in Use
TRM
＋V
＋S
−S
−V
+
Stabilize the output voltage
at load terminals
+
Load
＋
−
 ON/OFF Control (CNT terminal)
Without turning the input supply on and off, the output can
be enabled and disabled using this function. This func-
tion also can be used for output sequence of plural power
modules.
There are two kinds of logic control, negative logic control
and positive logic control, depend on the option selected.
ON/OFF control circuit is on the primary side (the input
side). For secondary control, isolation can be achieved
through the use of an opto-coupler or relay.
Notes
(1) Output ON/OFF control
(2) Secondary (output side) control
 Parallel Operation
Parallel Operation can not be used.
Standard
/T option Negative Logic L Level (0V≦L≦0.8V) or Short
/P option
/PT option
1. When ON/OFF control function is not used for the
2. When ON/OFF control function is not used for the
3. When using long wiring, for prevention of noise, at-
4. At L level, maximum source current from CNT termi-
5. The maximum CNT terminal voltage is 35V.
Standard and /T option, CNT terminal should be
shorted to –Vin terminal.
/P option and /PT option, CNT terminal should be
opened.
tach a 0.1µF capacitor between CNT terminal and
–Vin terminal.
nal to –Vin terminal is 0.5mA
Fig.9-2 Remote Sensing is Not in Use
Positive Logic
Logic
TRM
Fig.10-2 CNT Connection (2)
Fig.10-1 CNT Connection (1)
＋V
＋S
−S
−V
(output side)
Transistor, Relay
or Equivalent
Secondary
CNT Terminal Level to -Vin Terminal Output status
H Level (4V≦H≦35V) or Open
H Level (4V≦H≦35V) or Open
L Level (0V≦L≦0.8V) or Short
Stabilize the output viltage
at output terminals
+
Power
module
＋Vin
CNT
−Vin
＋Vin
CNT
−Vin
Power
module
Load
＋
−
OFF
OFF
ON
ON
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