Crane Aerospace & Electronics Power Solutions
MCH/MGH Single and Dual DC/DC Converters
28 VOLT INPUT – 1.5 WATT
F
EATURES
•
•
•
•
•
•
•
•
•
•
•
-55°C to +125°C operation
12 to 50 VDC input
Fully isolated
Magnetic feedback
Fixed frequency 370 kHz typ.
Topology – Current Mode Flyback
80 V for up to 120 ms transient protection
(70 V for 15 V single and dual models)
Inhibit function
Indefinite short circuit protection
Undervoltage lockout
Up to 79% efficiency (MGH models)
MODELS
VDC O
UTPUT
SINGLES
5
5.2
(MCH)
12
15
DUALS
±5
±12
±15
MCH SERIES™ SINGLE & DUAL
DC/DC CONVERTERS
With a miniature footprint of just 0.8 square inches, the MCH
Series™ of DC/DC converters delivers 1.5 watts of output power
while saving significant board real estate. The wide input voltage
range of 12 to 50 VDC accepts the varying voltages of military, aero-
space, or space bus power and tightly regulates output voltages to
protect downstream components. Transient protection of 80 volts for
up to 120 milliseconds exceeds the requirements of MIL-STD-704A
for the 5, 5.2, and 12 volt single models and the 12 volt dual model.
The 15 volt single and dual converters will withstand transients of up
to 70 volts for up to 120 milliseconds.
I
NHIBIT
F
UNCTION
When an open collector TTL logic low is applied to the inhibit
terminal, pin 7, the converter shuts down and lowers the output
voltage to near zero and input current to as low as 2.3 mA. Leaving
the terminal open or applying an open collector TTL logic high will
enable the converter.
P
ROTECTION
F
EATURES
Undervoltage lockout prevents the MCH Series converters from
operating below approximately 8 VDC input voltage to keep system
current levels smooth, especially during initialization or re-start oper-
ations. All models include a soft-start function to prevent large
current draw and minimize overshoot. The converters also provide
short circuit protection by restricting the current.
C
ONVERTER
D
ESIGN
MCH Series DC/DC converters incorporate a continuous flyback
topology with a constant switching frequency of approximately 370
kHz. Current-mode pulse width modulation (PWM) provides output
voltage regulation. Output error voltage is magnetically fed back to
the input side of the PWM to regulate output voltage. Regulation is
also affected by the load; refer to the Electrical Characteristics
tables on the following pages.
Dual models regulate the negative output with magnetic coupling to
the positive output. Up to 80% of the total load may be on one output
providing that the other output carries a minimum of 20% of the total
load. The dual models can be used at double the output voltage by
connecting the load between positive and negative outputs, leaving
the common unconnected. (ex: MCH2805D can be used as a 10
VDC output.)
MIL-STD-461
Use Interpoint’s FMSA-461 EMI filter to pass the CE03 requirements
of MIL-STD-461C.
C
ONVENIENT
P
ACKAGING
The MCH Series converters are packaged in hermetically sealed,
projection-welded metal cases which provide EMI/RFI shielding.
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 18
Rev E - 20060508
Crane Aerospace & Electronics Power Solutions
MCH/MGH Single and Dual DC/DC Converters
28 VOLT INPUT – 1.5 WATT
MGH SERIES™ SINGLE & DUAL
DC/DC CONVERTERS
The MGH Series™ of DC/DC converters delivers 1.5 watts of output
power in a labor saving surface mount package. The wide input
voltage range of 12 to 50 VDC accepts the varying voltages of mili-
tary, aerospace, or space applications. Single output converters
feature outputs of 5, 12, or 15 volts while dual output models feature
outputs of ±5, ±12, or ±15 volts. Transient protection of 80 volts for
up to 120 milliseconds exceeds the requirements of MIL-STD-704A
for the 5 and 12 volt single and dual models. The 15 volt single and
dual converters will withstand transients of up to 70 volts for up to
120 milliseconds.
P
ROTECTION
F
EATURES
Undervoltage lockout prevents the MGH Series converters from
operating below approximately 8 VDC input voltage to keep system
current levels smooth, especially during initialization or re-start oper-
ations. All models include a soft-start function to prevent large
current draw and minimize overshoot. The MGH Series of converters
also provide short circuit protection by limiting the current to approx-
imately 125% of full load.
MIL-STD-461
Use Interpoint’s FMGA-461 EMI filter to pass the CE03 requirements
of MIL-STD-461C.
C
ONVERTER
D
ESIGN
MGH Series DC/DC converters incorporate a continuous flyback
topology with a constant switching frequency of approximately 370
kHz. Output voltage regulation is accomplished on the primary side
using current-mode pulse width modulation (PWM). Regulation is
affected by the output load; refer to the specifications tables for more
information.
For dual output models, up to 80% of the total load may be on one
output providing the other output carries a minimum of 20% of the
total load. The dual models can be used at double the output voltage
by connecting the load between positive and negative outputs,
leaving the common unconnected. As an example the MGH2805D (5
volt dual output) can be used as a 10 VDC output.
S
URFACE
M
OUNT
P
ACKAGE
MGH DC/DC converters can be surface mounted with pick-and-
place equipment or manually. It is recommended that the case be
attached with flexible epoxy adhesive or silicone which is thermally
conductive (>1 watt /meter/°K).
Internal components are soldered with SN96 (melting temperature
221°C) to prevent damage during reflow. Maximum reflow tempera-
ture for surface mounting the MGH converter is 220°C for a
maximum of 30 seconds. SN60, 62, or 63 are the recommended
types of solder. Hand soldering should not exceed 300°C for 10
seconds per pin.
The hermetically sealed metal cases are available in two different
lead configurations. See case B for dimensions and options.
I
NHIBIT
F
UNCTION
When an open collector TTL logic low is applied to the inhibit
terminal, pin 18, the converter shuts down and lowers the output
voltage to near zero and input current to as low 2.3 mA. Leaving the
terminal open or applying an open collector TTL logic high will enable
the converter.
Positive
Input
+
+Vin
Inhibit
Shutdown
PWM
Controller
FB
+
+Vout
+
Input
Common
Case
Ground
Output
Common
Negative
Output
Positive
Output
Dual models only
F
IGURE
1: MGH B
LOCK
D
IAGRAM
www.craneae.com
Page 2 of 18
Rev E - 20060508
Crane Aerospace & Electronics Power Solutions
MCH/MGH Single and Dual DC/DC Converters
28 VOLT INPUT – 1.5 WATT
OPERATING CONDITIONS AND CHARACTERISTICS
Input Voltage Range
• 12 to 50 VDC continuous
• 80 V for 120 msec transient
(70 V for 15 V single and dual models)
Output Power
• 1.5 W
Capacitive Load
• 200 μF single output models
• 100 μF each output, dual output models
Lead Soldering Temperature
• Reflow 220°C 30 sec. max
SN60, 62 or 63 recommended solder
• Hand solder 300°C 10 sec. max per lead
Storage Temperature Range (Case)
• –65°C to +150°C
Case Operating Temperature (Tc)
• –55°C to +125°C full power
• –55°C to +135°C absolute
Derating Output Power/Current (Tc)
• Linearly from 100% at 125°C to 0% at 135°C
Output Voltage Temperature Coefficient
• 100 ppm/°C typical
Input to Output Capacitance
• 100 to 170 pF typical
Current Limit
• 125% of full load typical
Isolation
• 100 megohm minimum at 500 V
Audio Rejection
• 40 dB typical
Conversion Frequency (kHz)
• 25°C
300 min, 370 typ, 450 max
• –55°C to +125°C
270 min, 370 typ, 470 max
Inhibit Pin Voltage (unit enabled)
• 7 to 12 V
Undervoltage Lockout
• 8 V input typical
INHIBIT
Inhibit – TTL Open Collector
• Logic low (output disabled)
Logic low voltage ≤0.8 V
Inhibit pin current 1 mA max
• Referenced to input common
• Logic high (output enabled) open collector
MECHANICAL AND ENVIRONMENTAL
Size (maximum)
MCH models 0.980 x 0.805 x 0.270 inches (24.89 x 20.45 x 6.86 mm)
See case A2 for dimensions.
MGH models 1.010 x 0.880 x 0.250 inches (25.65 x 22.35 x 6.35 mm)
Shown on page one with “gull wing” lead option, also available with
straight leads. See case B for dimensions and options.
Weight (maximum)
12 grams typical
Screening
Standard, ES, or 883 (Class H, QML). See “883, Class H, QML Products –
Element Evaluation” and “883, Class H, QML Products – Environmental
Screening” for more information.
POSITIVE 1
INPUT
+
0.47
μF
typical
+V
IN
FB
+
3 POSITIVE
OUTPUT
INHIBIT
7
SHUTDOWN
PWM
CONTROLLER
+V
OUT
+
4 OUTPUT
COMMON
6 NEGATIVE
OUTPUT
DUAL MODELS ONLY
INPUT
COMMON
2
F
IGURE
2: MCH B
LOCK
D
IAGRAM
www.craneae.com
Page 3 of 18
Rev E - 20060508
Crane Aerospace & Electronics Power Solutions
MCH/MGH Single and Dual DC/DC Converters
28 VOLT INPUT – 1.5 WATT
PIN OUT MCH MODELS
Pin
1
2
3
4
5
6
7
Single Output
Positive Input
Input Common
Positive Output
Output Common
Case Ground
No connection
Inhibit
Dual Output
Positive Input
Input Common
Positive Output
Output Common
Case Ground
Negative Output
Inhibit
Squared corner and dot on
top of cover indicate pin one.
1 2
3
4
7
6
5
See case A2 for dimensions.
F
IGURE
3: MCH P
IN
O
UT
PINS NOT IN USE
Inhibit (INH1, INH2)
Pin 2, 12, 15, 16, 17
(pins with no connection)
Leave unconnected
Ground to input common
PIN OUT MGH MODELS
Pin
1
2
3
4, 5
6, 7
8, 9
10, 11
12
13, 14
15, 16, 17
18
Single Output
Positive Input
No connection
Input Common
Positive Output
Case Ground
Output Common
Case Ground
No connection
No connection
No connection
Inhibit
Dual Output
Positive Input
No connection
Input Common
Positive Output
Case Ground
Output Common
Case Ground
No connection
Negative Output
No connection
Inhibit
1
2
3
4
5
6
7
8
9
TOP VIEW
MGH
18
17
16
15
14
13
12
11
10
Differently colored glass bead around pin one or dimple in
header (bottom or side of case) indicates pin one.
Cover marking is oriented with pin one at the upper right corner.
See case B for dimensions and “gull-wing” option.
F
IGURE
4: MGH P
IN
O
UT
To meet specified performance, all pins must
be connected except “No Connection” pins.
www.craneae.com
Page 4 of 18
Rev E - 20060508
Crane Aerospace & Electronics Power Solutions
MCH/MGH Single and Dual DC/DC Converters
28 VOLT INPUT – 1.5 WATT
MCH Model Selection Table (see next page for MGH options)
MODEL NUMBERING KEY
SMD NUMBERS
S
TANDARD
M
ICROCIRCUIT
D
RAWING
(SMD)
5962-9569601HXC
5962-9569701HXC
5962-9569801HXC
5962-9570201HXC
5962-9570301HXC
5962-9570401HXC
MCH S
ERIES
S
IMILAR
P
ART
MCH2805S/883
MCH2812S/883
MCH2815S/883
MCH2805D/883
MCH2812D/883
MCH2815D/883
MCH
Base Model
Input Voltage
28 12 D / 883
Output Voltage
(R = decimal point, 3R3 = 3.3 Vout)
Number of Outputs
(S = single, D = dual)
Screening
(Standard screening has no designator
in this position.)
For exact specifications for an SMD product, refer to the SMD
drawing. SMDs can be downloaded from:
http://www.dscc.dla.mil/programs/smcr
Model Selection
MCH28
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: 5, 5R2, 12, 15
duals: 5, 12, 15
“
R” = decimal point, 3R3 = 3.3 VDC
S (single) or D (dual)
standard (case A2, leave blank)
standard screening, leave blank
/ES (ES screening), /883 (Class H, QML)
www.craneae.com
Page 5 of 18
Rev E - 20060508
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