32
PMC-A
3.1.2
When the Load Generates a Reverse Current
to the Power Supply
The PMC-A cannot absorb reverse current from the load.
Therefore, if a regenerative load (such as an inverter, converter,
or transformer) is connected, the output voltage increases and
becomes unstable.
For these types of loads, connect a resistor R
D
as shown in Fig.
3-3 "Remedy for regenerative load" to bypass the reverse cur-
rent. However, the amount of current to the load decreases by
Irp.
Fig. 3-3
Remedy for regenerative load
• For resistor R
D
, select an appropriate resistor rated
for the power (allowing s
u
fficient margin).
• If a resistor with ins
u
fficient rated power for the cir-
c
u
it is
u
sed, R
D
may b
u
rn o
u
t.
3.1.3
When the Load Has Accumulated Energy
Such As Batteries
When connecting to a load that has stored energy such as a bat-
tery, a large current flows from the load to the product's internal
capacitor through a protection diode in an internal output con-
I
O
R
D
E
O
Eq
u
ivalent circ
u
it
Regenerative load
Load
−
+
0
Reverse c
u
rrent
O
u
tp
u
t c
u
rrent
waveforms
-I
O
+I
O
I
rp
R
D
[
Ω
]
≤
E
O
[V]
I
rp
[A]
R
D
: “D
u
mmy road” that bypasses
reverse
c
u
rrent
E
O
: O
u
tp
u
t voltages
I
rp
: Maxim
u
m val
u
e of reverse c
u
rrent
CAUTION
