15W , DU AL OUTPUT , MIXED-V OL T A GE DC/DC CONVER TERS
XWR Series
4
Absolute Maximum Ratings
Input Voltage:
Continuous:
D12 Models
23 Volts
D24 Models
42 Volts
D48 Models
81 Volts
Transient (100msec): D12 Models
25 Volts
D24 Models
50 Volts
D48 Models
100 Volts
Input Reverse-Polarity Protection:
➁ Input Current must be limited. 1 minute
duration. Fusing recommended.
D12 Models
4 Amps
D24 Models
2 Amps
D48 Models
2 Amps
Output Current
➁
Current limited. Devices can withstand
an indefinite output short circuit.
On/Off Control (Pin 3) Max. Voltages:
Referenced to –Input (pin 2)
No Suffix
+VIN
S Suffix
+5.7 Volts
Storage Temperature
–40 to +120°C
Lead Temperature (Soldering, 10 sec.)
+300°C
These are stress ratings. Exposure of devices to any of these conditions may adversely
affect long-term reliability. Proper operation under conditions other than those listed in the
Performance/Functional Specifications Table is not implied, nor recommended.
TECHNICAL NOTES
Trimming Output Voltages
The DSM converters have a trim capability (Pin 9) that allow users to
adjust the output voltages ±5%. A trim adjustment will cause an equal
percentage of change in both outputs. Adjustments to the output voltages
can be accomplished via a trim pot, Figure 2, or a single fixed resistor as
shown in Figures 3 and 4. A single fixed resistor can increase or decrease
the output voltage depending on its connection. Fixed resistors should have
absolute TCR's less than 100ppm/°C to minimize sensitivity to changes in
temperature.
A single resistor connected from the Trim pin (Pin 9) to the +3.3V Output
(Pin 8), see Figure 3, will decrease the output voltages. A resistor connected
from the Trim pin (Pin 9) to Output Return (Pin 7) will increase the output
voltages.
Trim adjustments greater than 5% can have an adverse effect on the convert-
er's performance and is not recommended.
Figure 2. Trim Connections Using A Trimpot
DOWN
3.3 – VO
RT
(kΩ) =
–16.9
2.49(VO – 1.234)
20k
Ω
5-22
Turns
+INPUT
+5V OUTPUT
+3.3V OUTPUT
TRIM
OUTPUT
RETURN
–INPUT
CASE
1
2
4
ON/OFF
CONTROL
3
5
9
7
+5V LOAD
+3.3V LOAD
8
+5V LOAD
+3.3V LOAD
R TRIM
DOWN
+INPUT
+5V OUTPUT
+3.3V OUTPUT
TRIM
OUTPUT
RETURN
–INPUT
CASE
1
2
4
ON/OFF
CONTROL
3
5
9
7
8
+5V LOAD
+3.3V LOAD
R TRIM
UP
+INPUT
+5V OUTPUT
+3.3V OUTPUT
TRIM
OUTPUT
RETURN
–INPUT
CASE
1
2
4
ON/OFF
CONTROL
3
5
9
7
8
Figure 3. Decrease Output Voltage Trim Connections
Using A Fixed Resistor
Figure 4. Increase Output Voltage Trim Connections
Using A Fixed Resistor
Accuracy of adjustment is subject to tolerances or resistor values
and factory-adjusted output accuracy.
VO = desired output voltage.
RT
(kΩ) =
UP
VO – 3.3
–16.9
3.073
Ambient Temperature (˚C)
–40
0
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95 100
16
14
12
10
8
6
4
2
0
Output Power vs. Ambient Temperature
VIN = Nominal, Natural Convection Air flow
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