TDK-Lambda PH Series, Manual, Page: 55 / 58

PH
300S, 600S
PH
B-353
・All specifications are subject to change without notice.
PC
It is control terminal for parallel operation. It is connected
in all of PH modules in parallel operation. Shorten a wire
between PC terminals as much as possible. Unavoidably
the wire is long, then use twisted pair wire or shielded wire
to avoid noise affects.
When PC terminals in parallel operation are mutually con-
nected, voltage of all PC terminal is the average of PC
terminals at open circuit. +Input side of internal Op-Amp
A1(2/2) of parallel operation in proportion to the output
current in the module is supplied. At -input, voltage in pro-
portion to average of total output currents of all the mod-
ule is supplied. This Op-Amp makes output voltage of PH
modeles with less output current risen by TRM terminal
and activates output current in PH module balance.
TRM
TRM terminal in each PH module is connected. Con-
necting TRM terminal, control circuit of parallel operation
adjusts the output voltage of the module and balance the
output current.
-S
It is GND level of control circuit of parallel operation. Inter-
nal circuit activates based on -S. It shall be connected to
-S terminal of PH module. -S connection between modules
is to be connected one point of earth to avoid electrical
potential difference of each -S terminal of PH module by
voltage drop due to output current.
（3）Component Selection
Refer to following items to select components in control
circuit of parallel operation
Op-Amp (A1)
Use an Op-Amp which has singular power operation and
its input common mode voltage range from 0V. More-
over, it shall be low input off set voltage. For an example,
uPC842C(NEC) is one of available Op-Amp.
Transistor・FET (Q1-Q3)
FET (Q1) uses as analog switch. Use N channel small sig-
nal MOS-FET for general purpose (rated more than 25V,
50mA.)
Use NPN small signal type for transistor (Q2-Q4) (rated
more than 25V, 50mA.)
Capacitor (C1-C6)
For choosing capacitor(s), refer to values expressed in Fig-
ure3-2 and values for each component shown in Table3-2.
Use film capacitor or ceramic capacitor which has good
temperature characteristics.
The tolerance shall be less than ±5% .
Resistor (R1-R23, VR1)
For choosing capacitor(s), refer to values expressed in Fig-
ure3-2 and values for each component shown in Table3-2.
The tolerance shall be less than ±5% .
Values for each Component
Values of Capacitor C1, Resistor R1-R4, R18, R20, R23,
and Variable Resistor VR1 depend on model. Refer to Ta-
ble3-1 for components in PH300S280-*and Table3-2 for
components in PH600S280-*.
PH300S280, PH30048
C1
R1
R2
R3
R4
R18
R20
R23
VR1
3.3V 5V 12V 15V 24V 28V 48V
1000p 1000p 1000p 330p 330p 1000p 330p
1.2k
1.2k 1.2k 2.7k 5.1k 7.5k 10k
1.2k 1.2k 1.2k 2.7k 5.1k 7.5k 10k
150k 150k 300k 430k 750k 470k 750k
180k 180k 360k 470k 820k 510k 820k
9.1k 30k 30k 30k 30k 30k 30k
5.6k 12k 15k 15k 15k 15k 15k
18k 18k 11k 4.7k 2.4k 1.8k 360k
50k 50k 100k 100k 200k 100k 200k
Table3-1 PH300S280, PH300S48
Values for components in Control
Circuit of Parallel Operation
PH600S280
C1
R1
R2
R3
R4
R18
R20
R23
VR1
3.3V 5V 12V 15V 24V 28V 48V
1000p 1000p 1000p 330p 330p 1000p 1000p
1.2k
1.2k 1.2k 2.7k 5.1k 7.5k 10k
1.2k 1.2k 1.2k 2.7k 5.1k 7.5k 10k
180k 180k 220k 360k 510k 200k 390k
200k 200k 270k 390k 560k 240k 430k
9.1k 30k 30k 30k 30k 30k 30k
5.6k 12k 15k 15k 15k 15k 15k
18k 18k 11k 4.7k 2.4k 1.8k 360k
50k 50k 100k 100k 200k 100k 100k
Table 3-2 PH600S280
Values for components in Control
Circuit of Parallel Operation
unit : C[F], R[Ω]
Others
Values of capacitors and resistors are recommended val-
ues to operate power modules which have components
used in basic connection shown in Application Note. These
values may sometimes differ from the optimum values be-
cause of components at input and output side and wiring
environment. Confirm the performance of the circuit using
actual module when each value is determined.
4 Cautions for Wiring
Wiring from Input of A1 (1/2) to CS and -V terminals shall
be minimum length. Be aware of noise affects for A1 (1/2)
which makes small voltage amplify tens to hundreds times.
Also, load wire to united point of each load wire from output
of the power supply shall be minimum length too. Long wir-
ing can cause mis-operation of control circuit of parallel op-
eration. Unavoidably the wire is long, then attach an approx.
1mF capacitor between -V terminal and -S terminal.
If -S wiring is close by and parallel to load wire, use shield-
ed wire or twisted pair wire to connect -S to -V and also -S
itself. Without any measure, electrode of -S may be unstable
by influences of load wire and mis-operation may be oc-
curred.