Crane Aerospace & Electronics Power Solutions
sMrt28 singlꢂ, Dꢀꢄl ꢄnd tꢃiplꢂ spꢄꢇꢂ Dc/Dc convꢂꢃꢁꢂꢃꢈ
28 VOLt Iꢆꢅut – 35 Watt – sꢅace quaLIFIeD
trIM taBLes
tr I m up
tr I m D O w n
Singles
Singles
Rt r I m should be connected between the tꢃim pin and ꢅoꢈiꢁivꢂ sꢂnꢈꢂ pin.
Rt r I m should be connected between the tꢃim pin and sꢂnꢈꢂ rꢂꢁꢀꢃn pin.
Duals
Duals
Rt r I m should be connected between the tꢃim B pin and ꢅoꢈiꢁivꢂ Voꢀꢁ B
pin. This only trims output B, output A can use the sense pin to trim up
only. See page 2 for instructions on trimming up output A.
Rt r I m should be connected between the tꢃim B pin and Voꢀꢁ B rꢂꢁꢀꢃn pin.
This only trims output B, output A can use the sense pin to trim up only.
Triples
Triples
Rt r I m should be connected between the tꢃim a pin and Voꢀꢁ a rꢂꢁꢀꢃn pin
Rt r I m should be connected between the tꢃim a pin and ꢅoꢈiꢁivꢂ Voꢀꢁ
to adjust the Main outputs.
a pin to adjust the Main output.
Rt r I m should be connected between the tꢃim B pin and Voꢀꢁ B rꢂꢁꢀꢃn pin
Rt r I m should be connected between the tꢃim B pin and ꢅoꢈiꢁivꢂ Voꢀꢁ
to adjust the Auxiliary outputs.
B pin to adjust the Auxiliary outputs.
Vmax - Vout
Vout - Vnom
Rt r I m = K (
)
Vout - Vmin
Vnom - Vout
Rt r I m = K (
)
Vout = Desired Voltage; K/Vmax/Vnom from table below.
Vout = Desired Voltage; K/Vmin/Vnom from table below.
VꢀOM
K
VMAX
% OF VꢀOM
VꢀOM
K
VMIꢀ
% OF VꢀOM
3.3
5.0
7.0
8.7
12
3000
3000
5300
5300
5300
5300
3.70
6.26
112
125
118
149
122
124
3.3
5.0
7.0
8.7
12
3500
4520
3.18
4.16
5.47
6.13
7.05
7.65
96
83
78
70
58
51
8.27
8020
10.46
14.69
18.54
9040
11030
12900
15
15
ꢀote: Do not exceed maximum power rating when trimming up.
ꢀote: Do not exceed maximum current rating when trimming down,
1
2
3
4
5
14
13
1
2
3
4
5
14
13
Trim 12
11
Trim 12
SMRT Single
SMRT Single
11
10
9
10
Sense Return
9
8
Sense
8
1
2
3
4
5
Vout B Return 14
13
Trim B 12
1
2
3
4
5
14
SMRT Dual
11
10
9
Vout B 13
Trim B 12
SMRT Dual
11
10
9
8
8
1
2
3
4
5
14
Vout A 13
Trim A 12
1
2
3
4
5
14
Vout A Return 13
Trim A 12
SMRT Triple
11
10
9
+Vout B
SMRT Triple
11
Vout B Return 10
9
Trim B
8
Trim B
8
FI g u r e 1: tr I m DO w n DI a g r a m S
FI g u r e 2: tr I m up DI a g r a m S
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Page 4 of 19
SMRT28 Rev E - 20100216
CRANE [ Crane Aerospace & Electronics. ]
