Crane Aerospace & Electronics Power Solutions
SMTR Single, Dual and Triple DC/DC Converters
28 VOlT INPuT – 30 WaTT – PENDINg REVISION F RElEaSE
Electrical Characteristics: -55 to +125° C T
C
, 28 VDC Vin, 100% load, no irraditaion, unless otherwise specified.
SIngLE OUTPUT MODELS
parameter
Output VOltage
Output Current
Output pOwer
2
Output ripple
10
k
h
z tO
2 mh
z
line regulatiOn
lOaD regulatiOn
input VOltage
COnDitiOnS
25°C
V
in
= 16
V
in
= 16
tO
tO
SMTR281R5S
MIn
1.485
1.455
40 VDC
40 VDC
0
—
–
—
—
—
16
—
—
—
—
—
57
55
TYP
1.50
—
—
—
20
—
—
–
28
—
30
—
—
—
61
—
—
—
—
—
—
—
—
—
—
—
MAX
1.515
1.545
8.0
12
50
50
10
10
40
50
60
90
8
50
—
—
13
6
±125
200
±300
300
5
30
75
1000
SMTR285R2S
MIn
2.475
2.425
0
—
—
—
—
—
16
—
—
—
—
—
68
66
—
—
—
—
—
—
—
—
—
—
TYP
2.50
—
—
—
25
—
—
—
28
—
30
—
—
—
71
—
—
—
—
—
—
—
—
—
—
—
MAX
2.525
2.575
8.0
20
65
65
10
10
40
50
60
100
8
50
—
—
13
6
±150
200
±300
300
5
30
125
1000
SMTR283R3S
MIn
3.267
3.201
0
—
—
—
—
—
16
—
—
—
—
—
70
66
—
—
—
—
—
—
—
—
—
—
TYP
3.30
—
—
—
20
—
—
—
28
—
30
—
—
—
76
—
—
—
—
—
—
—
—
—
—
—
MAX
3.333
3.399
6.06
20
40
50
10
10
40
50
75
75
8
50
—
—
12
6
±250
200
±300
300
5
50
150
300
unitS
VDC
A
W
mV p-p
mV
mV
VDC
V
25°C
V
in
= 16
tO
40 VDC
nO lOaD tO Full
nO lOaD tO Full
COntinuOuS
TRAnSIEnT 50 ms
1
25°C, nO lOaD
nO lOaD
inhiBiteD
input Current
mA
mA p-p
%
W
ms
mV pk
µs
mV pk
µs
ms
mV pk
input ripple
Current
3
eFFiCienCy
lOaD Fault
7
10
k
h
z
- 10 mh
z
25°C
ShOrt CirCuit
pOwer DiSSipatiOn
reCOVery
1
50% - 100% - 50% lOaD
tranSient
reCOVery
1, 4
tranSient
reCOVery
4
Delay
OVerShOOt Full lOaD
1
OVerShOOt nO
lOaD
1
—
—
—
—
—
—
—
—
—
—
Step lOaD
reSpOnSe
5
Step line
reSpOnSe
1, 5
16 - 40 -16 VDC
Start-up
6
CapaCitiVe lOaD
1
25°C , nO eFFeCt On
DC perFOrmanCe
µF
notes (All temperatures in tables and notes refer to case temperature, T
C
.)
1. guaranteed by design, not tested.
2. Operation is limited below 16 V (see Figure 22).
3. Tested with 6800 pF ceramic bypass capacitors connected externally from input
common to case.
4. Recovery time is measured from application of the transient to the point at
which Vout is within 1% of final value.
5. Transient transition time > 10 µs.
6. Tested on release from inhibit.
7. Short circuit protection not guaranteed above 125°C case temperature.
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Rev F - 20090324 - Pending Revision F Release
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