PH100S280-5 TDK Corporation, PH100S280-5 Datasheet - Page 54

• Manufacturer Part Number: PH100S280-5
• Description: Power Supply, Power Rating 100 Watt, Output Current Rating 20.00 Ampere
• Manufacturer: TDK Corporation

Specifications of PH100S280-5

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

PH
B-352
（b）Control Circuit of Parallel Operation
（1）Parallel Operation
（2）Terminal Explanation of Figure3-2
PH
In case that the output of PH modules are connected in
parallel without control circuit of parallel operation, cur-
rent starts to flow from a power module with higher output
voltage as increasing the load current. This state may be
continued until the output voltage drops to be equal to
the other modules by dynamic load or descending voltage
in load wire or high output module becomes over current
protection condition and output voltage decreases. Do not
operate in such conditions because the load may be unbal-
anced and charges to only one power module.
To attach control circuits of parallel operation, the load
current in each power module can be monitored, and the
output voltage of modules with less load current may be
increased. Then the load current may be balanced.
CS
CS terminal of each module shall be connected. Shorten a
wire length from CS terminal to A1 input terminal as much
as possible to avoid noise affects. Unavoidably the wire is
long, then attach a capacitor (approx. 1mF) between CS
terminal and -V terminal.
Negative voltage is generated at CS terminal in proportion
to the output current. Figure3-3 shows an example of char-
acteristics of CS terminal voltage (when CS terminal is
opened). Under full load condition CS terminal voltage may
be approximately -20mV to -60mV based on -V terminal
(-100mV to -300mV for 28V, 48V output model).
CS terminal voltage can be expressed as Vcs = -R
descend of internal voltage of power module.
Temperature coefficient of R
rate of copper and approximately 4000 ppm/℃ .
For CS terminal voltage is a small voltage in negative
polarity, Op-Amp A1 (1/2) is amplifier inverting shown as
Figure3-2. For all of PH modules to be in parallel opera-
tion, VR1 shall be adjusted to equalize with the voltage at
A point at full load. Setting voltage of A point is 3V to 5V,
and the setting accuracy is within±2%. Voltage adjust-
ment of A point can be adjusted with PC terminal of open
circuit.
－V
It is signal ground of CS terminal voltage. Apart from the
wire to the load, it shall be connected near output terminal.
Equalize connection method and disposition to -V terminal
in each module.
R
module
I
o
i
: Output Current of PH module
Figure3-3 Characteristics of Output Current vs. CS
: Components of Resistor at internal output side of PH
300S, 600S
Terminal Voltage (Example: PH300S48-5)
−10
−15
−20
−25
−30
−5
0
0
20 40 60 80 100
Output Current （％）
i
is almost same resistance
i
x I
o
by
IOG
IOG terminal in each module shall be connected. IOG
terminal in PH module generates LOW output with open
collector output at normal operation. In control circuit of
parallel operation, connection of PC terminal would be cut
off by turning off MOSFET Q1 to use redundant operation
when IOG terminal of PH module abnormally generates
HIGH output.
Vcc
It is power supplement terminal to control circuit of parallel
operation. Connect 12±1V of stable DC power supply be-
tween -S terminal and Vcc terminal. Control circuit of par-
allel operation in out of the above Vcc voltage range may
cause mis-operation such as unstable load balance.
For models more than 12V output voltage, Vcc can be
supplied by +V shown in Figure3-5. Current consumption
per module in control circuit of parallel operation is ap-
proximately 10mA. Attach a capacitor (C6: 10mF) for by-
pass noise of power supply between Vcc terminal and -S
terminal in each control circuit of parallel operation.
Figure3-5 Example ：Vcc is supplied by +V
−
＋
＋
−
＋
＋
−
−
Figure3-4 -V Wiring Example
Control Circuit of
Parallel Operation
Control Circuit of Parallel Operation
to Control Circuit of Parallel Operation
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−
・All specifications are subject to change without notice.
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−
＋
＋
to Load
＋
Load
＋
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