DGP12 SERIES – DUAL OUTPUT
DGP12 SERIES BLOCK DIAGRAM
4
+
SHIELDED ISOLATION TRANSFORMER
+ OUTPUT
OUTPUT POWER DERATING
12
POWER OUTPUT
5
+
+ INPUT
CMN
10
1
+
8
– INPUT
2
CURRENT
MODE
PWM
6
– OUTPUT
+
7
TRIM
6
ON/OFF
3
–
ISO AMP
4
50
60
70
80
90
AMBIENT TEMPERATURE
100
FIVE SIDED SHIELDED COPPER CASE
LOW TC BANDGAP REFERENCE
APPLICATION NOTES (cont’d):
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/drain 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. The input capacitors are kept fully
charged in the OFF mode. For proper operation, do
not drive this input from a logic gate directly. The
ON/OFF pin must be left floating for proper
operation. Be aware that this input may be noise
sensitive; use proper PCB design guidelines. The
ON/OFF pin should never be pulled more than 0.3
volts below -INPUT or have a voltage greater than
2 volts applied.
Output TRIM
The TRIM pin may be used to adjust the output
±10% 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 the dual 5 volt output. 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.
+OUT
4
TRIM
7
-OUT
6
USING TRIMPOT
Figure 1.
Typical Performance: (Tc=25°C, Vin=Nom VDC, Rated Load)
EFFICIENCY Vs. LOAD
85
80
LINE = 16VDC
85
80
50% FULL LOAD
EFFICIENCY Vs. LINE INPUT VOLTAGE
EFFICIENCY (%)
EFFICIENCY (%)
75
LINE = 5VDC
70
65
60
55
0
10
20
30
40
50
60
70
80
90 100
75
70
65
60
55
50
4
6
8
10
12
14
16
100% FULL LOAD
LOAD (%)
LINE INPUT (VOLTS)
INPUT CURRENT Vs. INPUT VOLTAGE
6
5
4
3
2
1
50% LOAD
0
0
2
4
6
8
10
12
14
16
100% LOAD
2.5
INPUT CURRENT Vs. LINE INPUT
RMS INPUT CURRENT (AMPS)
INPUT CURRENT (AMPS)
2.0
1.5
100% LOAD
75% LOAD
1.0
40% LOAD
0.5
0.0
3
5
7
9
11
13
15
17
LINE INPUT (VOLTS)
LINE INPUT (VDC)
POWER DERATING
110
100
90
80
70
60
50
40
3
5
7
9
11
13
15
17
+OUT
4
TRIM
DOWN
10K
LOAD
TRIM
7
-OUT
6
USING FIXED RESISTORS
LOAD
TRIM
UP
% AVAILABLE POWER
LINE INPUT (VDC)
3
POWER-ONE [ POWER-ONE ]
