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