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DFA20E48S5 Datasheet(PDF) 3 Page - Power-One

Part # DFA20E48S5
Description  SINGLE OUTPUT
Download  4 Pages
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Manufacturer  POWER-ONE [Power-One]
Direct Link  http://www.power-one.com
Logo POWER-ONE - Power-One

DFA20E48S5 Datasheet(HTML) 3 Page - Power-One

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background image
3
5
+OUT
7
TRIM
10K
LOAD
USING TRIMPOT
6
-OUT
5
+OUT
7
TRIM
TRIM
DOWN
TRIM
UP
LOAD
USING FIXED RESISTORS
6
-OUT
DFA20 SERIES – SINGLE OUTPUT
DFA20 SERIES APPLICATION NOTES:
External Capacitance Requirements
No external capacitance is required for operation of the DFA20
Series. The use of input capacitors with less than 0.5 ESR may
cause peaking in the input filter and degrade filter performance.
External output capacitance is not required for operation, however
it is recommended that 1 F to 10 F of tantalum and 0.001 to
0.1 F ceramic capacitance be selected for reduced system noise.
Additional output capacitance may be added for increased
filtering, but should not exceed 400 F.
Negative Outputs
A negative output voltage may be obtained by connecting the
+OUT to circuit ground and connecting -OUT as the negative
output.
Remote ON/OFF Operation
The remote ON/OFF pin may be left floating if this function is not
used. It is recommended to drive this pin with an open collector
arrangement or a relay contact. When the ON/OFF pin is pulled
low with respect to the -INPUT, the converter is placed in a low
power drain state.
Output TRIM
The TRIM pin may be used to adjust the output ±5% from the
nominal setting. This function allows adjustment for voltage drops
in the system wiring, as well 5.2 volt outputs for ECL applications.
Figure 1 shows the proper connections to use this function. A
trimpot value of 10K should be used for 3.3 and 5 volt outputs.
A trimpot value of 20K should be used for 12 and 15 volt
outputs. If the TRIM function is not required the pin may be
left floating.
Figure 1.
DFA20 SERIES BLOCK DIAGRAM
5
+ OUTPUT
ISOLATION TRANSFORMER
+
6
7
TRIM
ISOLATED
FEEDBACK
LOW TC
BANDGAP
REFERENCE
FIVE SIDED SHIELDED COPPER CASE
+
2
– INPUT
ON/OFF
1
3
+ INPUT
CURRENT
MODE
PWM
THERMAL SHUTDOWN
LC
INPUT
FILTER
- OUT
50
0
5
10
15
20
60
70
80
90
100
OUTPUT POWER DERATING
AMBIENT TEMPERATURE
NUCLEAR AND MEDICAL APPLICATIONS Power-One products are not authorized for use as critical components in life support systems, equipment used in hazardous environments,
or nuclear control systems without the express written consent of the President of Power-One, Inc.
TECHNICAL REVISIONS The appearance of products, including safety agency certifications pictured on labels, may change depending on the date manufactured. Specifications are
subject to change without notice.


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