Datasheet
DCV 01
+V
OUT
V
SUPPLY
+V
OUT
-V
OUT
-V
OUT
0V
V
S
0V
COM
DCV 01
V
OUT1
V
SUPPLY
V
S
0V
DCV 01
V
OUT2
V + V
OUT1 OUT2
SYNC
IN
SYNC
IN
V
S
0V
0V
0V
COM
DCV01 Series
SBVS014A –AUGUST 2000–REVISED DECEMBER 2013
www.ti.com
ADDITIONAL FUNCTIONS
DISABLE/ENABLE
The DCV01 can be disabled or enabled by driving the SYNC pin using an open drain CMOS gate. If the SYNC
IN
pin is pulled low, the DCV01 will be disabled. The disable time depends upon the external loading; the internal
disable function is implemented in 2 μs. Removal of the pull down will cause the DCV01 to be enabled.
Capacitive loading on the SYNC
IN
pin should be minimized in order to prevent a reduction in the oscillator
frequency.
DECOUPLING
Ripple Reduction
The high switching frequency of 400 kHz allows simple filtering. To reduce ripple, it is recommended that at least
a 1-μF ceramic capacitor is used on V
OUT
. Dual outputs should both be decoupled to pin 5. A 2.2-μF low-ESR
ceramic capacitor on the input of the 5-V input versions, and a 0.47-μF low ESR cap on the 24-V input versions
is recommended.
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 using the floating outputs provided by the galvanic isolation of the DCV01.
Connect the positive V
OUT
from one DCV01 to the negative V
OUT
(0 V) of another, as shown in Figure 10. 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 connection without external filtering, thus
minimizing cost. The outputs on the dual-output DCV01 versions can also be connected in series to provide two
times the magnitude of V
OUT
, as shown in Figure 11. For example, a dual 15-V DCV01 could be connected to
provide a 30-V rail.
Figure 10. Connecting the DCV01 in Series
Figure 11. Connecting Dual Outputs in Series
8 Submit Documentation Feedback Copyright © 2000–2013, Texas Instruments Incorporated