Crane Aerospace & Electronics Power Solutions
MHV single, dual and triple dc/dc converters
28 Volt input – 15 Watt
Features
• Operating temperature -55° to +125°C
• Input voltage range 16 to 50 VDC
- 12 Vout single and dual to 75 V
- 15 Vout single and dual to 60 V
vDC o
utput
single
no cross regulation on dual outputs
• Transient protection 80 V for 120 ms
• Fully isolated
• Fixed frequency switching
• Inhibit and sync functions
MODELS
D
ual
±5
±12
±15
• Output trim on single output models
• High power density, up to 83% efficiency
3.3
5
12
15
+5 & ±12
+5 & ±15
triple
description
Interpoint’s 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.
i
nhibit
F
unCtion
The converter is enabled when the inhibit terminal is left uncon-
nected. When the inhibit terminal is pulled low (<0.8 V) the
converter shuts down, typically drawing 8.4 mA at 28 Vin or 15
mA at 50 Vin. Sinking current required is Vin / 3.3 K ohm.
s
ynChronization
F
unCtion
C
onverter
D
esign
Applying an external signal of 40% to 60% duty cycle and 490
to 710 kHz for singles and duals 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.
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 opera-
tion. Each of the PWMs operates at approximately one-half (300
kHz) of the clock frequency. This proprietary technology mini-
mizes 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.
t
rim
Single output converters feature a trim range of as low as 80%
to as high as 110% of Vout nominal, depending on the model.
To trim up, connect a resistor from output common (pin 4) to the
trim terminal (pin 3). To trim down, connect a resistor from the
positive output (pin 5) to the trim terminal (pin 3). See Figure 4
and trim tables for more information.
s
Creening
The converters are offered with standard screening, “ES”
screening, or fully compliant to “883” MIL-PRF-38534 Class H
screening. Standard microcircuit drawings (SMD) are available.
Crane Aerospace & Electronics
Electronics Group (Interpoint Brand)
PO Box 97005 • Redmond WA 98073-9705
425.882.3100 • power@crane-eg.com
www.interpoint.com
Page 1 of 19
MHV Rev E - 20100503
Crane Aerospace & Electronics Power Solutions
MHV single, dual and triple dc/dc converters
28 Volt input – 15 Watt
u
nDervoltage
l
oCkout
o
utput
v
oltage
o
ptions
An undervoltage lockout of approximately 7 VDC keeps system
current levels low during startup. Low line dropout typically occurs
at approximately 12 Vin to 17 Vin depending on model. See
Figures 12, 16 and 17.
The MHV Series converters are capable of providing other
output voltage options in addition to those characterized on this
datasheet. Contact your sales representative to discuss other
output voltage options, www.interpoint.com/contacts.
s
hort
C
irCuit
p
roteCtion
Under short circuit conditions of 130% or more of full load
current, the converter will protect itself by shutting down. Short
circuit duration should be brief because power dissipation may
cause internal temperatures to rise rapidly. Restart is automatic
upon removal of the short circuit.
us p
atents
Interpoint converters may use one or more of the following US
patents 5,521,807, 5,694,303, and 5,631,822.
siMplified scHeMatic diagraM
+Vin
Inhibit
Main
Output
PWM
Controller
Primary
Opto
Secondary
Feedback
Output
Common
+Aux
Sync
PWM
Controller
-Aux
Primary
Opto
Secondary
Feedback
Input
Common
F
igure
1: mhv t
riple
b
loCk
D
iagram
www.interpoint.com
MHV Rev E - 20100503
Page 2 of 19
Crane Aerospace & Electronics Power Solutions
MHV single, dual and triple dc/dc converters
28 Volt input – 15 Watt
Operating COnditiOns and CharaCteristiCs
input Voltage range
• 16 to 50 VDC continuous
• 80 VDC for 120 ms transient
‣
12 Vout single and dual to 75 V
‣
15 Vout single and dual to 60 V
synC and inhibit
sync in (twice the pWM conversion frequency)
• Input (clock) frequency
- Single and dual output models 490 to 710 kHz
- Triple output models 500 to 700 kHz
• Duty cycle 40% min, 60% max
• Active low 0.8 V max
• Active high 4.5 V min, 10 V max
• Referenced to input common
• If not used, leave unconnected
output power
• 15 watts (10 watts MHV283R3S)
lead soldering temperature (10 sec per lead)
• 300°C
storage temperature range (t
c
)
• -65°C to +150°C
current limit
• 130% of full load typical at 25° T
C
isolation at 25° t
c
• 100 megohm minimum at 500 V
audio rejection
• 30 dB typical
output Voltage temperature coefficient
• 100 ppm/°C typical
derating output power/current
• Linearly from 100% at 125°C to 0% at 130°C
case operating temperature (t
c
)
• -55°C to +125°C full power
• -55°C to +130°C absolute
inhibit
• Active low (output disabled)
‣
Active low voltage ≤0.8 V
‣
Inhibit pin source current
- Typically 8.4 mA at 28 Vin, or 15 mA at 50 Vin
- Sinking current required is Vin / 3.3 K ohms
‣
Referenced to input common
• Active high (output enabled)
‣
Open collector
‣
Unconnected or 11.5 to 50 V
‣
Open pin voltage 11 V typ
undervoltage lockout
• 7 V input typical
conversion (switching) frequency
• Free run mode (each PWM) 300 kHz typical
‣
245 kHz. min, 355 kHz. max (T
C
= -55° to +125°C)
meChaniCal and envirOnmental
size (maximum)
• Non-flanged Single and dual output models
‣
2.125 x 1.125 x 0.400 inches (53.98 x 28.58
mm). See case H2 for dimensions.
• Triple output models
‣
1.950 x 1.350 x 0.405 inches (49.53 x 34.29
mm). See case F1 for dimensions.
• Flanged Single and dual output models
‣
2.910 x 1.125 x 0.400 inches (73.91 x 28.58
mm). See case K3 for dimensions.
• Triple output models
‣
2.720 x 1.350 x 0.405 inches (69.09 x 34.29
mm). See case J1 for dimensions.
Weight (maximum)
• 60 grams typical
x 10.16
x 10.29
x 10.16
x 10.29
low line dropout
• Typically occurs at 12 Vin to 17 Vin depending on model
• See Figures 12, 15 and 21
screening
• Standard, ES, or 883 (Class H). See Screening Tables 1
and 2 for more information.
www.interpoint.com
MHV Rev E - 20100503
Page 3 of 19
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
10 Input Common
Inhibit (pin 8 on triple
output models)
F
igure
2: t
ypiCal
C
onneCtions
1
Positive Input
FMCE-0328
(1)
EMI FILTER
Positive Output
2
1
Positive Input
MHV
28V
5
Input Common
Output Common 4
3
Case
(2)
10 Input Common
6, 7, 8
Chassis Ground
(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.
F
igure
3: emi F
ilter
C
onneCtion
triM – single output Models only
CALCULATED TRIM
Trim down: R
T
(KΩ) =
Trim up:
R
T
(KΩ) =
QUICK REFERENCE TRIM TABLE
V
o
= desired output voltage
(
(
V
o nominal
– V
0
2.5A
V
o –
V
o nominal
(V
o
– 2.5)
)
)
V
out
noMinal
95%
4
23
177
255
R
T
3
TRIM
+V
O
A–B
–B
Model
MHV283R3S
MHV2805S
MHV2812S
MHV2815S
110% 106% 102%
18
8
N/A
0.3
36
20
19
21
128
81
116
122
90%
N/A
5
67
104
80%
N/A
N/A
11
28
R
TRIM
(R
T
) K ohms
FORMULA VALUES By MODEL
MODEL:
A
B
3.3 V
3.7
10
5V
3.7
10
12 V
14
30
15 V
18.0
80
MHV
SINGLE
OUTPUT
TRIM DOWN
5
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
4: mhv s
ingle
o
utput
t
rim
www.interpoint.com
MHV Rev E - 20100503
Page 4 of 19
Crane Aerospace & Electronics Power Solutions
MHV single, dual and triple dc/dc converters
28 Volt input – 15 Watt
pin
1
2
3
4
5
8
9
Positive Input
Inhibit
Trim
single output
dual output
Inhibit
pin out
Positive Input
Positive Output
triple output
Positive Input
Main (+5) Output
Output Common
Negative Aux. Output
Positive Aux. Output
Case Ground
Inhibit
Sync In
Output Common
Positive Output
Case Ground
Case Ground
Sync In
Input Common
Output Common
Negative Output
Case Ground
Case Ground
Sync In
Input Common
6, 7
10
Input Common
Dot on top of cover
indicates pin one.
Dot on top of cover
indicates pin one.
1
2
3
4
5
1
2
3
4
5
BOTTOM VIEW
MHV TRIPLE
FLANGED AND NON-FLANGED
10
9
8
7
6
10
BOTTOM VIEW
MHV SINGLE AND DUAL
FLANGED AND NON-FLANGED
9
8
7
6
Dotted line outlines flanged package option.
Dotted line outlines flanged package option.
See cases H2 and K3 for dimensions.
F
igure
5: p
in
o
ut
s
ingles anD
D
uals
See cases F1 and J1 for dimensions.
F
igure
6: p
in
o
ut
t
riple
inhibit
case
pins not in use
User’s discretion
sync in
Leave unconnected
Leave unconnected
www.interpoint.com
MHV Rev E - 20100503
Page 5 of 19
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