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DCP021212DU Datasheet(PDF) 7 Page - Texas Instruments

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Part No. DCP021212DU
Description  Miniature, 2W, Isolated UNREGULATED DC/DC CONVERTERS
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

DCP021212DU Datasheet(HTML) 7 Page - Texas Instruments

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ADDITIONAL FUNCTIONS
DISABLE/ENABLE
DECOUPLING
Connecting the DCP02 in Parallel
Ripple Reduction
Connecting the DCP02 in Series
DCP
02
+V
OUT
V
SUPPLY
+V
OUT
-VOUT
-VOUT
0V
V
S
0V
COM
C
requiresalow-ESRceramiccapacitor:5Vto15Vversionis2.2 F;
24Vversionisminimum0.47 F.
m
IN
m
NOTE:(1)
C
IN
(1)
C
1.0 F
OUT
m
C
1.0 F
OUT
m
V
SUPPLY
2xPowerOut
COM
DCP
02
V
OUT
V
S
0V
SYNC
0V
DCP
02
V
OUT
V
S
0V
SYNC
0V
C
requiresalow-ESRceramiccapacitor:5Vto15Vversionis2.2 F;
24Vversionisminimum0.47 F.
m
IN
m
NOTE:(1)
C
IN
(1)
C
1.0 F
OUT
m
C
IN
(1)
C
1.0 F
OUT
m
DCP02 Series
SBVS011K – MARCH 2000 – REVISED FEBRUARY 2008
Connect the positive VOUT from one DCP02 to the
The DCP02 can be disabled or enabled by driving the
negative VOUT (0V) of another (see Figure 7). If the
SYNC pin using an open drain CMOS gate. If the
SYNC pins are tied together, the self-synchronization
SYNC pin is pulled low, the DCP02 will be disabled.
feature of the DCP02 prevents beat frequencies on
The disable time depends upon the external loading;
the voltage rails. The SYNC feature of the DCP02
the internal disable function is implemented in 2
µs.
allows
easy
series
connection
without
external
Removal of the pull down causes the DCP02 to be
filtering, thus minimizing cost.
enabled.
The outputs on the dual-output DCP02 versions can
Capacitive loading on the SYNC pin should be
also be connected in series to provide two times the
minimized in order to prevent a reduction in the
magnitude of VOUT, as shown in Figure 8. For
oscillator frequency.
example,
a
dual
15V
DCP022415D
could
be
connected to provide a 30V rail.
If the output power from one DCP02 is not sufficient,
it is possible to parallel the outputs of multiple
The high switching frequency of 400kHz allows
DCP02s, as shown in Figure 9. Again, the SYNC
simple filtering. To reduce ripple, it is recommended
feature
allows
easy
synchronization
to
prevent
that a 1
µF capacitor be used on V
OUT. Dual outputs
power-rail beat frequencies at no additional filtering
should both be decoupled to pin 5. A 2.2
µF capacitor
cost.
on the input is also recommended.
Multiple DCP02 isolated 2W DC/DC converters can
be connected in series to provide nonstandard
voltage rails. This configuration is possible by using
the floating outputs provided by the galvanic isolation
of the DCP02.
Figure 8. Connecting Dual Outputs in Series
Figure 9. Connecting Multiple DCP02s in Parallel
Copyright © 2000–2008, Texas Instruments Incorporated
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Product Folder Link(s): DCP02 Series


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