Crane Aerospace & Electronics Power Solutions
SMRT Single, Dual and Triple DC/DC Converters
28 VOLT INPUT – 35 WATT
TRIM TABLES
T
RIM DOWN
Singles
R
TRIM
should be connected between the
Trim
pin and
Positive Sense
pin.
Duals
R
TRIM
should be connected between the
Trim B
pin and
Positive Vout
B
pin. This only trims output B, output A can use the sense pin to trim up
only.
Triples
R
TRIM
should be connected between the
Trim A
pin and
Positive Vout
A
pin to adjust the Main output.
R
TRIM
should be connected between the
Trim B
pin and
Positive Vout
B
pin to adjust the Auxiliary outputs.
R
TRIM
= K (
Vout - Vmin
)
Vnom - Vout
1
2
3
4
5
SMRT Single
14
13
Trim 12
11
10
9
Sense 8
1
2
3
4
5
SMRT Dual
14
Vout B 13
Trim B 12
11
10
9
8
1
2
3
4
5
SMRT Triple
14
Vout A 13
Trim A 12
+Vout B 11
10
9
Trim B 8
Vout = Desired Voltage; K/Vmin/Vnom come from table below.
F
IGURE
1: T
RIM
D
OWN
D
IAGRAMS
V
NOM
3.3
5.0
12
15
K
3500
4520
11030
12900
V
MIN
3.18
4.16
7.05
7.65
% OF
RATED
96
83
58
51
T
RIM
U
P
Singles
R
TRIM
should be connected between the
Trim
pin and
Sense Return
pin.
Duals
R
TRIM
should be connected between the
Trim B
pin and
Vout B Return
pin. This only trims output B, output A can use the sense pin to trim up
only.
Triples
R
TRIM
should be connected between the
Trim A
pin and
Vout A Return
pin
to adjust the Main outputs.
R
TRIM
should be connected between the
Trim B
pin and
Vout B Return
pin
to adjust the Auxiliary outputs.
1
2
3
4
5
SMRT Single
14
13
Trim 12
11
10
Sense Return 9
8
1
2
3
4
5
SMRT Dual
Vout B Return 14
13
Trim B 12
11
10
9
8
R
TRIM
= K (
Vmax - Vout
)
Vout - Vnom
Vout = Desired Voltage; K/Vmax/Vnom come from table below.
1
2
3
4
5
SMRT Triple
14
Vout A Return 13
Trim A 12
11
Vout B Return 10
9
Trim B 8
V
NOM
3.3
5.0
12
15
K
3000
3000
5300
5300
V
MIN
3.70
6.26
14.69
18.54
% OF
RATED
112
125
122
124
MIN V
IN
22
22
19
22
F
IGURE
2: T
RIM
U
P
D
IAGRAMS
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Page 4 of 17
Rev B – 20080213
CRANE [ Crane Aerospace & Electronics. ]
