DFC15 SERIES – SINGLE OUTPUT
DFC15 SERIES BLOCK DIAGRAM
OUTPUT POWER DERATING
SHIELDED ISOLATION TRANSFORMER
15
10
5
+ OUTPUT
5
+
+
1
2
+ INPUT
– INPUT
6
7
- OUTPUT
TRIM
CURRENT
MODE
PWM
+
–
ON/OFF
3
ISOLATED
FEEDBACK
LOW TC
BANDGAP
REFERENCE
0
FIVE SIDED SHIELDED COPPER CASE
40
50
60
70
80
90
AMBIENT TEMPERATURE
Typical Performance: (Tc=25°C, Vin=Nom VDC, Rated Load)
APPLICATION NOTES (cont’d):
Remote ON/OFF Operation
EFFICIENCY Vs. LOAD
EFFICIENCY Vs. LINE INPUT VOLTAGE
90
85
80
75
70
65
60
85
82
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
50% FULL LOAD
LINE = 20VDC
LINE = 48VDC
100% FULL LOAD
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. Do not drive this input from a logic
gate directly; there is a 100Kꢁ internal pull-up
resistor to a 9 volt source.
80
77
75
LINE = 60VDC
0
0
0
10 20 30 40 50 60 70 80 90 100
20
25
30
35
40
45
50
55
60
LOAD (%)
LINE INPUT (VOLTS)
Output TRIM
INPUT RIPPLE Vs. LINE INPUT
100% FULL LOAD
INPUT CURRENT Vs. INPUT VOLTAGE
1.00
0.80
The TRIM pin may be used to adjust the
output 5ꢀ 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 10Kꢁ should be used for 5 volt
outputs. A trimpot value of 20Kꢁ should be
used for 12 and 15 volt outputs. If the TRIM
function is not required the pin may be left
floating.
1.2
1.0
0.8
0.6
75% FULL LOAD
0.60
0.40
50% FULL LOAD
100% LOAD
50% LOAD
0.4
0.2
0.0
0.20
20
25
30
35
40
45
50
55 60
10
20
30
40
50
60
LINE INPUT (VOLTS)
LINE INPUT (VOLTS)
OUTPUT VOLTAGE Vs. OUTPUT LOAD
120
100
80
+OUT
TRIM
-OUT
+OUT
TRIM
-OUT
5
7
6
5
7
6
TRIM
DOWN
10K
LOAD
LOAD
TRIM
UP
60
40
20
0
USING TRIMPOT
USING FIXED RESISTORS
Figure 1.
20
40
60 80 100 120 140 160 180
OUTPUT LOAD (%)
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.
3
