Crane Aerospace & Electronics Power Solutions
MHV Single, Dual and Triple DC/DC Converters
28 VOLT INPUT – 15 WATT
F
EATURES
•
•
•
•
•
•
•
–55° to +125°C operation
16 to 50 VDC input
Fully Isolated
Optocoupler feedback
Fixed switching frequency
600 kHz typical,
Topology –
Dual Single Ended Flybacks
80 V / 120 ms transient protection
(12 Vout single and dual to 75 V,
15 Vout single and dual to 60V)
Inhibit and sync functions
Trim on single output models
Up to 81% efficiency
Low output noise
MODELS
VDC O
UTPUT
SINGLE
DUAL
TRIPLE
3.3
±5
+5 & ±12
5
±12
+5 & ±15
12
±15
15
•
•
•
•
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 converters will withstand transients of up to 80 V for up to 120
milliseconds while maintaining output voltages (with the exception of
the 12 volt single and dual outputs which will withstand transients up
to 75 volts and the 15 volt single and dual outputs which will with-
stand up to 60 volts). The MHV Series operates at a full 15 watts of
output power (10 watts for the 3.3 volt single output) over the mili-
tary temperature range of –55°C to +125°C while maintaining low
input and output noise.
When a low (0.8 V) is applied to the inhibit terminal the converter
shuts down, typically drawing 8.4 mA of input current. Inhibit
terminal resistance is 3.3 k ohms and draws 8.4 mA, typical.
S
YNCHRONIZATION
F
UNCTION
Applying an external signal of 40% to 60% duty cycle and 500 to
700 kHz will synchronize the converter to your system requirements.
Free run clock frequency is approximately 600 kHz. If not used, the
sync terminal must be left unconnected.
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 6 and trim
tables for more information.
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
internal converters with one converter phase shifted 180° from the
other to create a dual phase/phase-shifted operation. Each of the
internal converters operates at approximately one-half of the clock
frequency. This proprietary technology eliminates cross regulation,
minimizes input ripple, greatly reduces output ripple and improves
efficiency. On the triple output models, this design provides
completely independent regulation with no cross regulation effect
between the main and auxiliary outputs and no minimum loading
required on the main output.
U
NDERVOLTAGE
L
OCKOUT
An undervoltage lockout of approximately 7 VDC keeps system
current levels low during startup.
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 dura-
tion should be brief because power dissipation may cause internal
temperatures to rise rapidly. Restart is automatic upon removal of
the short circuit.
I
NHIBIT
F
UNCTION
Open collector TTL levels control the inhibit circuit. The converter is
enabled when the inhibit terminal is left unconnected or when the
inhibit terminal is connected to a voltage between 11.5 and 50 V.
Crane Aerospace & Electronics
Electronics Group (Interpoint Brand)
PO Box 97005 • Redmond WA 98073-9705
425.882.3100 • electronics@craneae.com
www.craneae.com
Page 1 of 14
Rev D - 20060710
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
• Transient: see Electrical Characteristics tables
Output Power
• 15 watts (10 watts MHV283R3S)
Lead Soldering Temperature (10 sec per lead)
• 300°C
Storage Temperature Range (Case)
• –65°C to +150°C
Case Operating Temperature (Tc)
• –55°C to +125°C full power
• –55°C to +130°C absolute
Derating Output Power/Current
• Linearly from 100% at 125°C to 0% at 130°C
Output Voltage Temperature Coefficient
• 100 ppm/°C typical
Current Limit
• 130% of full load typical at 25°C
Isolation
• 100 megohm minimum at 500 V
Audio Rejection
• 30 dB typical
Conversion (Switching) Frequency
• Free run mode 300 kHz typical
245 kHz. min, 355 kHz. max
@ Tc = -55° to +125°C
Inhibit Pin Voltage (unit enabled)
• 11 V typical
Undervoltage Lockout
• 7 V input typical
Clock Frequency
• External sync range 490 to 710 kHz.
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 x 10.16 mm)
See case H2 for dimensions.
Triple output models
1.950 x 1.350 x 0.405 inches (49.53 x 34.29 x 10.29 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 x 10.16 mm)
See case K3 for dimensions.
Triple output models
2.720 x 1.350 x 0.405 inches (69.09 x 34.29 x 10.29 mm)
See case J1 for dimensions.
Weight (maximum)
60 grams typical
Screening
Standard, ES, or 883 (Class H). See “883, Class H, QML
Products – Element Evaluation” and “883, Class H, QML
Products – Environmental Screening” for more information.
SYNC AND INHIBIT
Sync In (490 to 710 kHz)
• Duty cycle 40% min, 60% max
• Logic low 0.8 V max
• Logic high 4.5 V min, 10 V max
• Referenced to input common
• If not used, leave unconnected
Sync Out - Referenced to input common
Inhibit (INH1, INH2) : TTL Open Collector
• Logic low (output disabled)
Logic low voltage ≤0.8 V
Inhibit pin current
8.4 mA typical, 10 mA maximum
• Referenced to input common
• Logic high (output enabled)
Open collector
Unconnected or 11.5 to 50 V
Positive
Input
0
o
Positive
Output,
Main (+5)
PWM CM
Controller
Feedback Isolator
Input
Common
Output
Common
Positive
Output,
Auxiliary
Sync.
PWM CM
Controller
Feedback Isolator
180
o
Negative
Output,
Auxiliary
F
IGURE
1: MHV T
RIPLE
B
LOCK
D
IAGRAM
www.craneae.com
Page 2 of 14
Rev D- 20060710
Crane Aerospace & Electronics Power Solutions
MHV Single, Dual and Triple DC/DC Converters
28 VOLT INPUT – 15 WATT
PIN OUT
Pin
1
2
3
4
5
6,7
8
9
10
Single Output
Positive Input
Inhibit
Trim
Output Common
Positive Output
Case Ground
Case Ground
Sync In
Input Common
Dual Output
Positive Input
Inhibit
Positive Output
Output Common
Negative Output
Case Ground
Case Ground
Sync In
Input Common
Triple Output
Positive Input
Main (+5) Output
Output Common
Neg. Aux. Output
Pos. Aux. Output
Case Ground
Inhibit
Sync In
Input Common
Case
Inhibit (INH1, INH2)
Sync In
PINS NOT IN USE
User’s discretion
Leave unconnected
Leave unconnected
Leave sync pin (pin 9) unconnected if not used.
Dot on top of cover
indicates pin one.
Dot on top of cover
indicates pin one.
1
1
2
3
4
5
2
3
4
5
BOTTOM VIEW
MHV TRIPLE
FLANGED AND NON-FLANGED
10
9
8
7
6
10
9
8
7
6
Dotted line outlines flanged package option.
See cases H2 and K3 for dimensions.
Dotted line outlines flanged package option.
See cases F1 and J1 for dimensions.
F
IGURE
2: P
IN
O
UT
S
INGLES AND
D
UALS
F
IGURE
3: P
IN
O
UT
T
RIPLE
www.craneae.com
Page 3 of 14
Rev D- 20060710
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
www.craneae.com
Page 4 of 14
Rev D- 20060710
Crane Aerospace & Electronics Power Solutions
MHV Single, Dual and Triple DC/DC Converters
28 VOLT INPUT – 15 WATT
MODEL NUMBERING KEY
MHV
Base Model
Input Voltage
Output Voltage
(Main and aux. Vout for triple models)
(R = decimal point, 3R3 = 3.3 Vout)
Number of Outputs
(S = single, D = dual, T = triple)
Case Option
(Non-flanged case has no designator in
this position)
Screening
(Standard screening has no designator
in this position.)
28 512 T
F / 883
SMD NUMBERS
S
TANDARD
M
ICROCIRCUIT
D
RAWING
(SMD)
5962-9852801HXC
5962-9852201HXC
5962-9852301HXC
5962-9852401HXC
5962-9852501HXC
5962-9852601HXC
5962-9852701HXC
5962-9673001HXC
5962-9673101HXC
MHV S
ERIES
S
IMILAR
P
ART
MHV283R3S/883
MHV2805S/883
MHV2812S/883
MHV2815S/883
MHV2805D/883
MHV2812D/883
MHV2815D/883
MHV28512T/883
MHV28515T/883
Flanged SMD numbers for the MHV Series of converters have
the suffix HZC instead of HXC. For exact specifications for an
SMD product, refer to the SMD drawing available at
www.dscc.dla.mil/programs/smcr.
Model Selection
MHV28
Base model
Vout value
number of outputs
case option
screening
Choose one from each of the following rows
Vout value
Number of outputs
Case option
Screening
for singles or duals: 3R3, 5, 12, or 15
“R” = decimal point, 3R3 = 3.3VDC
for triples*: 512 or 515
S (single), D (dual) or T (triple)
non-flanged case option, leave blank
standard screening, leave blank
F (flanged case option),
/ES (ES screening), /883 (Class H, QML)
* for triple models “5” indicates the main voltage, “12” or“15” indicate the ± auxiliary voltages.
www.craneae.com
Page 5 of 14
Rev D- 20060710
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