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VXR15-2812SM Datasheet(PDF) 9 Page - VPT, Inc.

Part No. VXR15-2812SM
Description  HIGH RELIABILITY COTS DC-DC CONVERTERS
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Maker  VPT [VPT, Inc.]
Homepage  https://www.vptpower.com/
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VXR15-2812SM Datasheet(HTML) 9 Page - VPT, Inc.

 
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VXR15-2800S SERIES DATASHEET
6.0
SALES INFORMATION: phone (425) 353-3010 • fax (425) 353-4030 • vptsales@vptpower.com • www.vptpower.com
9
6.2.2 Adjusting the Output Voltage (TRIM)
The output voltage set point of the converter can be adjusted using the TRIM pin.
To adjust the output up, connect the trim resistor from TRIM to OUTCOM. To
adjust the output down, connect the trim resistor from TRIM to +VOUT. The
maximum trim range is -20% and +10% from nominal. The appropriate resistor
values versus the output voltage are given in the table below. Because the TRIM
pin can be sensitive to external noise, the trim resistor should be physically
located close to the VXR15 converter with short interconnects. The TRIM pin
should be left open if not used. When adjusting the output voltage, do not
exceed the rated total output power or output current.
VXR15-283R3S
VXR15-2805S
VXR15-2812S
VXR15-2815S
+Vout (V)
Rtrim
(Ω)
+ Vout
(V)
Rtrim
(Ω)
+ Vout
(V)
Rtrim
(Ω)
+ Vout
(V)
Rtrim
(Ω)
3.6
36.3k
5.5
19.7k
13.2
5.42k
16.5
3.1k
3.55
44.5k
5.4
25.9k
13
7.58k
16.25
4.8k
3.5
57.0k
5.3
36.2k
12.8
10.8k
16
7.3k
3.45
77.7k
5.2
56.8k
12.6
16.4k
15.75
11.4k
3.4
119k
5.1
119k
12.4
27.7k
15.5
19.6k
3.35
244k
5
12.2
64.8k
15.25
44.0k
3.3
4.9
362k
12
15
3.25
395k
4.8
173k
11.8
469k
14.75
540k
3.2
190k
4.7
110k
11.6
240k
14.5
261k
3.15
122k
4.6
78.9k
11.4
158k
14.25
169k
3.1
87.8k
4.5
60.1k
11.2
116k
14
123k
3.05
67.2k
4.4
47.6k
11
90k
13.75
95.2k
3
53.5k
4.3
38.6k
10.8
73k
13.5
76.7k
2.95
43.7k
4.2
31.9k
10.6
61k
13.25
63.6k
2.9
36.4k
4.1
26.7k
10.4
51k
13
53.8k
4
22.5k
10.2
44k
12.75
46.1k
10
38k
12.5
40.0k
9.8
33k
12.25
35.0k
9.6
29k
12
30.8k
6.3 PROTECTION FEATURES
6.3.1 Input Undervoltage Lockout
The VXR15-2800S Series provides input undervoltage lockout protection. For input voltages below the turn-on voltage, the converter
will remain off, drawing minimal current from the source. When the input voltage exceeds the turn-on voltage, the converter will
start. The lockout circuit is designed to accept slow ramping input voltage waveforms. The VXR15 -2800S circuit provides bias voltage
to all secondary control circuits and control amplifiers before the output starts, ensuring a well-controlled start up sequence.
6.3.2 Output Soft Start
The VXR15-2800S Series utilizes an output soft-start function to ramp the output in a controlled manner, eliminating output voltage
overshoot and limiting inrush current at turn on. A voltage-mode soft-start ensures the output waveform remains consistent
regardless of changes in the load current. The output rise time is approximately 4 ms. The soft-start function is active whether the
module is turned on with an application of input voltage or from release of the inhibit pin. Under normal conditions, current drawn
from the source during turn-on will not exceed the full-load input current. The turn-on delay time is specified from the application of
input voltage (or release of the inhibit pin) until the output reaches 90% of its final value.


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