Crane Aerospace & Electronics Power Solutions
mHV single, dual and triple dc-dc converters
28 Volt input – 15 Watt
Features
no cross regulation on dual outputs
•
Input voltage range 16 to 50 VDC
- 12 Vout single and dual to 75 V
- 15 Vout single and dual to 60 V
models
DuAL
±5
±12
±15
•
Operating temperature -55° to +125°C
•
Transient protection 80 V for 120 ms
•
Fully isolated
•
Fixed frequency switching
•
Inhibit and sync functions
•
undervoltage lockout
•
Output trim on single output models
SInGLE
5
12
15
VDC O
utput
TRIPLE
+5 & ±12
+5 & ±15
description
The Interpoint
®
MHV Series™ of dc-dc converters offers a
wide input voltage range of 16 to 50 VDC and a choice of nine
different output voltage configurations comprised of single, dual
or triple outputs. The 3.3 volt single, 5 volt single and dual and
the triple output models will withstand transients of up to 80 volts
for up to 120 milliseconds while maintaining output voltages.
The 12 volt single and dual outputs will withstand transients up
to 75 volts and the 15 volt single and dual outputs will withstand
up to 60 volts for 120 milliseconds. The MHV Series operates at
15 watts of output power (10 watts for the 3.3 volt single output)
over the military temperature range of -55°C to +125°C while
maintaining low input and output noise.
The converter is enabled when the inhibit terminal is left
unconnected. When the inhibit terminal is pulled low (<0.8 V)
the converter shuts down, typically drawing 8.4 mA at 28 V
In
or
15 mA at 50 V
In
. Sinking current required is V
In
/ 3.3 k ohm. For
more information see Table 7 on page 7.
i
nhibit
F
unCtion
s
ynChronization
F
unCtion
C
onverter
D
esign
MHV Series dc-dc converters are switching regulators that use
continuous flyback conversion topology with a clock frequency of
approximately 600 kHz. MHV Series converters incorporate two
pulse width modulators (PWM) with one PWM phase shifted 180°
from the other to create a dual phase/phase-shifted operation.
Each of the PWMs operates at approximately one-half (300 kHz)
of the clock frequency. This proprietary technology minimizes
input ripple and improves efficiency. On singles the output
ripple is reduced. Cross regulation is eliminated on dual output
models which are independently regulated and do not require
load balancing or minimum loading. On triple output models, this
design provides completely independent regulation with no cross
regulation effect between the main and auxiliary outputs and no
minimum loading is required on the main output.
Applying an external signal of 40% to 60% duty cycle and 490
to 710 kHz for single and dual output models will synchronize
the converter to your system requirements. For triple output
models the external frequency range is 500 to 700 kHz. Free run
clock frequency is approximately 600 kHz. If not used, the sync
terminal must be left unconnected. See Table 7 on page 7
t
rim
Single output converters feature a trim range of as low as 80% to
as high as 110% of V
OuT
nominal, depending on the model. To
trim up, connect a resistor from Output Common (pin 4) to Trim
(pin 3). To trim down, connect a resistor from the Positive Output
(pin 5) to Trim (pin 3). For more information see “Table 1: Trim
Table”, “Table 2: Formula Values by Model” and “Figure 6: MHV
Single Output Trim” on page 4.
s
Creening
The converters are offered with standard screening, “ES”
screening, or fully compliant to “883” MIL-PRF-38534 Class H
screening. See “Table 13: Element Evaluation” on page 19 and
“Table 14: Environmental Screening” on page 20. Standard
microcircuit drawings (SMD) are available. See “Table 5: SMD
Cross Reference” on page 6.
Crane Aerospace & Electronics
Power Solutions - Interpoint Products
10301 Willows Road NE, Redmond, WA, 98052
+1.425.882.3100 • power@crane-eg.com
www.craneae.com/interpoint
MHV Rev AA - 2014.03.04
Page 1 of 20
Crane Aerospace & Electronics Power Solutions
mHV single, dual and triple dc-dc converters
28 Volt input – 15 Watt
1
28V
9
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
FMCE-0328
(1)
EMI FILTER
5
Input Common
Output Common 4
3
Case
(2)
Positive Output
2
1
Positive Input
MHV
10 Input Common
Case Ground
(3)
28V
Chassis Ground
Notes:
(1). FMCE-0328 can provide up to 84 watts throughput current at 28 volts in and will bring the converter into
compliance with MIL-STD-461C CE03 and CS01 and/or MIL-STD-461D, E and F CE102 and CS101 levels of
conducted emissions.
(2). 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.
(3). Case ground for single and dual models is pins 6, 7, and 8. For triple models it is pins 6 and 7.
F
igure
5: emi F
ilter
C
onneCtion
single output trim
TRIM TABLE
V
OuT
nOMInAL
MODEL
MHV283R3S
MHV2805S
MHV2812S
MHV2815S
Trim down: R
T
(kΩ) =
110%
18
8
n/A
0.3
106% 102%
36
20
19
21
128
81
116
122
95%
4
23
177
255
90%
n/A
5
67
104
80%
n/A
n/A
11
28
Trim up:
R
T
(kΩ) =
R
TRIM
(R
T
) k ohms
V
o
= desired output voltage
(
(
V
o nominal
– V
o
2.5 A
V
o –
V
o nominal
(V
o
– 2.5)
)
)
A–B
–B
F
ormula
1: mhv s
ingle
o
utPut
t
rim
t
able
1: t
rim
t
able
R
T
3
TRIM
+V
O
TRIM DOWN
5
FORMuLA VALuE By MODEL
MODEL
A
B
3.3 V
3.7
10
5V
3.7
10
12 V
14
30
15 V
18.2
30
MHV
SINGLE
OUTPUT
t
able
2: F
ormula
v
alues by
m
oDel
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
www.craneae.com/interpoint
MHV Rev AA - 2014.03.04
Page 4 of 20
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