TDK-Lambda PH Series, Manual, Page: 39 / 58

PH
50
-
150, 75
-
300F
PH
B-337
・All specifications are subject to change without notice.
＋V
−V
＋
50mm
Load
Oscilloscope
JEITA
Attachment
R：50Ω
C：4700pF
As Short as Possible
1.5m 50Ω
Coaxial Cable
Figure3-1: Measurement Method of Maximum Output
Ripple Voltage
(including Noise)
4 MAXIMUM LINE REGULATION
Maximum line regulation is defined as the output voltage
deviation when the input voltage is slowly varied (steady-
state) within the input voltage range.
5 MAXIMUM LOAD REGULATION
Maximum load regulation is defined as the output voltage
deviation when the output current is slowly varied (steady-
state) within the output current range.
〈S type〉
A minimum load current of more than 3% (4% for PH50S)
of the nominal output current shall be taken when the load
current is dynamically changed. In case the load current is
changed from less than the above minimum load current
value, the output voltage may dynamically fluctuate.
When using module in dynamic load mode, audible noise
could be heard and output voltage fluctuation will increase.
Therefore, please evaluate thoroughly when using this
module.
6 OVER CURRENT PROTECTION (OCP)
OCP function is provided.
Output will automatically recover when short or overload
condition is released. This setting value is fixed and can-
not be change externally.
Note that the module may be damaged depending on ther-
mal conditions when operating continuously under short or
overload condition for a long period.
7 OVER VOLTAGE PROTECTION (OVP)
OVP function is provided.
The setting value is relative to the nominal output voltage
and is fixed. Therefore, it cannot be changed externally.
To recover the output voltage after OVP function activates,
wait until input voltage becomes less than the following
voltage values and then reapply input voltage.
S type F type
24VDC Input 10VDC 10VDC
48VDC Input 13.5VDC 4.5VDC
110VDC Input 25VDC 10VDC
280VDC Input 90VDC 25VDC
Table7-1: Input Voltage to Release OVP
8 THERMAL PROTECTION
Thermal protection is provided.
This function activates for abnormal ambient temperature
rise and abnormal internal temperature rise of power supply
and shuts the output off. Thermal protection will activate at
100±15℃ baseplate temperature.
To recover the output, shut off the input once, and then
reapply input after the baseplate temperature has been
cooled down sufficiently.
9 REMOTE SENSING (+S, -S TERMINALS)
In the power modules except S type of 50W and 75W,
there are remote sensing terminals to compensate the volt-
age drop caused by wiring to load terminal from output ter-
minal of the power supply. If the remote sensing function is
unnecessary (i.e. local sensing is used), shorten with wires
+S terminal to +V terminal, and -S terminal to -V terminal.
Compensated voltage range of line drop (voltage drop by
wiring) shall be set such that output voltage bV
and –V does not exceed specified output voltage range and
output must be within the maximum output power value.
Also, line drop voltage between -V and -S (-V and negative
side of the load) shall be less than 2V. To avoid and to
decrease the noise affects, shielded wire, twisted wire, and
parallel pattern wire etc. shall be used as remote sensing
wire.
＋
−
＋V
＋S
−V
−S
Load
Stabilize the output voltage at
Load terminal
＋
−
＋V
＋S
−V
−S
Load
Stabilize the output voltage at
output terminal
＋
＋
Figure9-1: Using Remote Sensing
＋
−
＋V
＋S
−V
−S
Load
Stabilize the output voltage at
Load terminal
＋
−
＋V
＋S
−V
−S
Load
Stabilize the output voltage at
output terminal
＋
＋
Figure9-2: Without Remote Sensing
ON/OFF CONTROL (CNT TERMINAL)
The output can be turned on or off without shutting down
the input.
The control circuit is in the input side (primary side), and
CNT terminal is used. The ground of CNT terminal is SG
terminal for a module with SG terminal, and -V
in
terminal
for a module without SG terminal. -V terminal and SG ter-
minal is connected inside of the module. If this function is
unnecessary, short CNT and SG terminals.