Crane Aerospace & Electronics Power Solutions
MHV Single, Dual and Triple DC/DC Converters
28 VOLT INPUT – 15 WATT
1
9
28V
2
Positive Input
Sync In
MHV
Inhibit (pin 8 on triple
output models)
10 Input Common
F
IGURE
4: T
YPICAL
C
ONNECTIONS
1
Positive Input
FMC-461
Positive Output
2
1
Positive Input
MHV
28V
or FMH-461
EMI FILTER
5
Input Common
Output Common 4
3
Case*
10 Input Common
6, 7, 8
Chassis Ground
*The case ground connection should be as low an impedance as possible to minimize EMI.
Direct contact of baseplate to chassis ground provides the lowest impedance.
F
IGURE
5: EMI F
ILTER
C
ONNECTION
TRIM – SINGLE OUTPUT MODELS ONLY
Calculated Trim
Quick Reference Trim Table
Trim down: R
T
(kΩ) =
Trim up:
R
T
(kΩ) =
(
(
(V
o
– 2.5)
V
o nominal
– V
0
2.5A
V
o –
V
o nominal
)
)
M
ODEL
A–B
MHV283R3S
% V
OUT
N
OMINAL
110
18
8
n/a
0.3
106 102
95
90
R
TRIM (
(R
T
) k ohms
36
20
19
21
128
81
116
122
R
T
3
TRIM
+V
O
TRIM DOWN
5
80
n/a
n/a
11
28
4
23
177
255
n/a
5
67
104
–B
MHV2805S
MHV2812S
MHV2815S
V
o
= desired output voltage
Formula
3.3V
A
3.7
B
10
Values by Model
5V
12V 15V
3.7
14
18.2
10
30
30
MHV
SINGLE
OUTPUT
Notes
If calculated result is a negative value, the desired output voltage is outside the allowed trim range.
Calculated values of R
T
are ±15%.
When trimming up, do not exceed the maximum output power.
When trimming down, do not exceed the maximum output current.
OUTPUT
COMMON
4
TRIM UP
F
IGURE
6: MHV S
INGLE
O
UTPUT
T
RIM
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Rev D- 20060710
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