Crane Aerospace & Electronics Power Solutions
sMsa single and dual dc/dc converters
28 Volt input – 5 Watt - pending reVision F release
Positive
6
Input
SMSA
12 k V
5kV
Inhibit
200 pF
10 K
3.9 K
5
400 V
50 k V
2N3904
10 k V
7
Vcc
Typically 1.5 V
when inhibited
Input
Common
F
igure
3: i
nhibit
i
nterFaCe
EMI Filter
Positive
Input
Input
Common
Positive
Output
Output
Common
SMSA2815S
Positive
Input
Input
Common
Positive
Output
Output Common
T1
C2
+
C3 To Load
From input
power source
Case
Case
C1
T1
F
igure
4: l
OW
n
OiSe
O
utput
F
ilter FOr
SmSa S
ingle
O
utput
m
ODel
emi Filter
Positive
input
input
Common
Positive
output
output
Common
smsa2815d
Positive
input
input
Common
Positive
output
output Common
negative
output
Case
C1
T1
C2
C4
+
C3
To loads
+
C5
From input
power source
Case
T1
F
igure
5: l
OW
n
OiSe
O
utput
F
ilter FOr
SmSa D
ual
O
utput
m
ODel
The filter suggestions in Figures 4 and 5 will further reduce the output ripple for systems requiring very low output noise.
C1 = 0.27 µF ceramic capacitor, 500V
C2 = C4 = 6.8 µF tantalum capacitor
C3 = C5 = 0.27 µF ceramic capacitor
Single output: T1 = 15T #28 AWG winding on toroid, µ
i
= 5000
Dual output: T2 = 10T #28 AWG winding on toroid, µ
i
= 5000
For best results, make interconnections as short as possible.
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Page 4 of 14
Rev F - 20090318 - Pending Revision F Release
CRANE [ Crane Aerospace & Electronics. ]
