Datasheet

8
DCV01
®
FIGURE 2. Connecting Dual Outputs in Series.
Connecting the DCV01 in Series
Multiple DCV01 isolated 1W DC/DC converters can be
connected in series to provide nonstandard voltage rails.
This is possible by utilizing the floating outputs provided by
the DCV01’s galvanic isolation.
Connect the positive V
OUT
from one DCV01 to the negative
V
OUT
(0V) of another (see Figure 1). If the SYNC
IN
pins are
tied together, the self-synchronization feature of the DCV01
will prevent beat frequencies on the voltage rails. The
SYNC
IN
feature of the DCV01 allows easy series connec-
tion without external filtering, minimizing cost.
The outputs on dual output DCV01 versions can also be
connected in series to provide two times the magnitude of
V
OUT
as shown in Figure 2. For example, a dual 15V DCV01
could be connected to provide a 30V rail.
Connecting the DCV01 in Parallel
If the output power from one DCV01 is not sufficient, it is
possible to parallel the outputs of multiple DCV01s, as
shown in Figure 3. Again, the SYNC
IN
feature allows easy
synchronization to prevent power-rail beat frequencies at no
additional filtering cost.
PCB LAYOUT
Ripple and Noise
Careful consideration should be given to the layout of the
PCB in order that the best results can be obtained.
The DCV01 is a switching power supply and as such can
place high peak current demands on the input supply. In
order to avoid the supply falling momentarily during the fast
switching pulses ground and power planes should be used to
track the power to the input of DCV01. If this is not possible
then the supplies must be connected in a star formation with
the tracks made as wide as possible.
If the SYNC
IN
pin is being used then the tracking between
device SYNC
IN
pins should be short to avoid stray capaci-
tance. If the SYNC
IN
pin is not being used it is advisable to
place a guard ring, (connected to input ground) around this
pin to avoid any noise pick up.
The output should be taken from the device using ground
and power planes, this will ensure minimum losses.
A good quality low ESR capacitor placed as close as
practicable across the input will reduce reflected ripple and
ensure a smooth start up.
A good quality low ESR capacitor placed as close as
practicable across the rectifier output terminal and output
ground will give the best ripple and noise performance.
THERMAL MANAGEMENT
Due to the high power density of this device it is advisable
to provide ground planes on the input and output.
FIGURE 3. Connecting Multiple DCV01s in Parallel.
DCV 01
+V
OUT
V
SUPPLY
+V
OUT
–V
OUT
–V
OUT
0V
V
S
0V
COM
DCV 01
0V
0V
V
OUT
V
SUPPLY
V
S
0V
DCV 01
V
OUT
2 x Power Out
SYNC
IN
SYNC
IN
V
S
0V
COM