Connecting the DCP0105 in Series
Connecting the DCP0105 in Parallel
Multiple DCP0105 isolated 1W DC/DC converters can be
connected in series to provide non-standard voltage rails.
This is possible by utilizing the floating outputs provided by
the DCP0105’s galvanic isolation.
If the output power from one DCP0105 is not sufficient, it
is possible to parallel the outputs of multiple DCP0105s (see
Figure 6). Again, the SYNC feature allows easy synchroni-
zation to prevent power-rail beat frequencies at no additional
filtering cost.
Connect the positive VOUT from one DCP0105 to the nega-
tive VOUT (0V) of another (see Figure 4). If the SYNCIN pins
are tied together, the self-synchronization feature of the
DCP0105 will prevent beat frequencies on the voltage rails.
The SYNC feature of the DCP0105 allows easy series
connection without external filtering which is necessary in
competing solutions.
THERMAL MANAGEMENT LAYOUT
To maximize the thermal performance of the DCP0105,
taking more care in the PCB layout can provide the most
efficient thermal dissipation paths from the DC/DC. The
input controller IC and the rectifier diodes inside the DCP0105
are bonded directly onto the internal leadframe. The
leadframe, being almost 100% copper, provides an excellent
path for dissipated heat and does so significantly more
efficiently than FR4 PCBs or ceramic substrates found in
alternate packaging technology DC/DCs.
The outputs on dual output DCP0105 versions can also be
connected in series to provide 2 times the magnitude of
VOUT (see Figure 5). For example, a dual 12V DCP010512D
could be connected to provide a 24V rail.
VSUPPLY
VOUT 1
VS
SYNCIN
0V
DCP
0105
0V
VOUT1 + VOUT 2
VS
VOUT 2
DCP
0105
SYNCIN
0V
0V
COM
FIGURE 4. Connecting the DCP0105 in Series.
VSUPPLY
+VOUT
VS
0V
+VOUT
–VOUT
0V
DCP
0105
–VOUT
COM
FIGURE 5. Connecting Dual Outputs in Series.
VSUPPLY
VOUT
VS
SYNCIN
0V
DCP
0105
0V
2 x Power Out
VS
VOUT
DCP
0105
SYNCIN
0V
0V
COM
FIGURE 6. Connecting Multiple DCP0105s in Parallel.
®
15
DCP0105
BB [ BURR-BROWN CORPORATION ]
