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参数资料
| 型号： | CG3020-9DB |
| 厂商： | POWER-ONE INC |
| 元件分类： | 电源模块 |
| 英文描述： | 3-OUTPUT 25 W DC-DC REG PWR SUPPLY MODULE |
| 文件页数： | 15/16页 |
| 文件大小： | 158K |
| 代理商： | CG3020-9DB |
Board Mountable
DC-DC Converters
G Series
Edition 1/06.2002
8/16
Auxiliary Functions
Connection in Parallel
(Current sharing T referenced to Go)
The outputs of several units with equal nominal output
voltages can be connected in parallel. To ensure that the
output currents are approximately shared between the
units for lower stress and further improved reliability the T
pins of all converters need to be interconnected. In spite of
the T connection the load leads should have equal length
and cross section. If output voltage adjustment is requested
it is recommended to adjust the output voltages individually
to within a tolerance of 1...2% prior to paralleling or to con-
nect the R pins together. No more than 3 units should be
connected in parallel.
Note: – Parallel connection of auxiliary outputs without in-
volving their main outputs should be avoided.
– Parallel connection of units can slightly enlarge
the output voltage noise.
– If units are connected in parallel using decoupling
diodes as e.g. for redundant systems the T pins
should not be interconnected.
Uo OK Output (only for units without option D)
Uo OK, referenced to Go
The Uo OK output is an open collector output without inter-
nal pull-up resistor indicating wether the main feedback
loop is in regulation or not. In overload condition the output
voltage feedback loop will go into saturation and Uo OK will
go to low state. The external pull-up resistor needs to be
connected to a supply voltage less than 5.5 V (e.g. Vo1+
output).
Table 5: Uo OK output
Feedback Loop
Uo OK
In regulation
open circuit
Out of regulation
≤0.5 V at I
Uo OK sink ≤2.5 mA
Important: Pull-up voltages higher than 5.5 V may
damage the unit.
Fig. 15
Switching frequency versus input voltage and load.
Fig. 17
Audio rejection Ui to Uo1.
Fig. 16
Output impedance versus frequency.
14 16
18
20
22
24
26
28
30
U i [V]
300
400
500
600
700
fs [kHz]
32
34
36
50 % Po nom
100 % Po nom
06026
0.01
0.1
1
10
100
1000
f [kHz]
–50
–40
–30
–20
–10
0
10
Zo [dB]
Uo2
Uo3
Uo1
06028
10
100
1000
10000
100000
f [Hz]
–100
–90
–80
–70
–60
–50
–40
–30
–20
Ui/Uo Attenuation [dB]
06027
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