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