
Electrical Characteristics: -55°C to +125°C TC, 28 VDC Vin, 100% load, unless otherwise specified.
SIngLE OUTPUT MODELS
SMRT2812S
SMRT2815S
unItS
parameter
COnDItIOnS
MIn
TYP
MAX
MIn
TYP
MAX
Output VOltage
11.76 12.00 12.24 14.70 15.00 15.30
VDC
Output Current 2
—
2.92
—
2.33
A
Output pOwer 2
VIn = 19 tO 56 VDC
0
—
35
0
—
35
W
Output rIpple
10 khz - 20 mhz
—
200
—
180
mV p-p
lIne regulatIOn 2
VIn = 19, 50 VDC
—
5
30
—
5
30
mV
lOaD regulatIOn
—
5
40
—
5
40
mV
VIn = 19, 50 VDC
—
90
—
90
tOtal regulatIOn 1
VOUT
all COnDItIOnS OF
lIne, lOaD, agIng,
temp anD raDIatIOn
10.9
—
13.1
14.0
—
16.0
VDC
Input VOltage
COntInuOuS
19
28
56
19
28
56
VDC
tranSIent 1 120 ms
0
—
80
0
—
80
V
Input Current
InhIbIteD
—
50
—
50
mA
nO lOaD
—
110
—
110
Input rIpple Current 3
10 kHz - 20 MHz
—
10
50
—
10
50
mA p-p
eFFICIenCy
75
—
75
—
%
lOaD Fault 4, 5
POWERDISSIPATION
—
20
—
20
W
reCOVery 1
—
25
—
25
ms
Step lOaD reSpOnSe 5, 6, 7
tranSIent
—
±575
—
±575
mV pk
reCOVery
—
3
—
3
ms
Step lIne reSpOnSe 1, 5, 6
19 - 50 - 19 VIn
tranSIent
—
±700
—
±700
mV pk
reCOVery
—
4
—
4
ms
Start-up 8
Delay
nO lOaD anD Full
—
25
—
25
ms
OVerShOOt
—
120
—
150
mV pk
CapaCItIVe lOaD 1
tC = 25°C
unCOnDItIOnally
Stable, Start-up
Delay InCreaSeD
—
5000
—
5000
F
notes
1. guaranteed by design, not tested.
2. To maintain tight regulation over the full input voltage range a minimum load of 2% of full load should be used on all outputs.
3. Converters meet MIL-STD-461 specification revisions for conducted emissions C-CE03 and D-/E-/F-CE-102. The actual value of input ripple
current is much less, the limit in the characteristic table is based on measurement resolution..
4. Maximum power dissipation when output is shorted.
5. Recovery time is measured from application of the transient to point at which VOUT is within 1% of VOUT at final value.
6. Transition time >10 s.
7. Half load to/from full load.
8. Measured from release of inhibit or input voltage step
Crane Aerospace & Electronics Power Solutions
www.craneae.com/interpoint
Page 11 of 22
sMrt28 single, Dual and triple space Dc/Dc converters
28 VOLt Input – 35 Watt – space quaLIFIeD
SMRT28 Rev F - 2011.01.24