FEATURES
• –55° to +125°C operation
MGH SERIES
1.5 WATT
DC/DC CONVERTERS
28 VOLT NPUT
• 12 to 50 VDC input
• Fully Isolated
I
• Magnetic feedback
MODELS
VDC OUTPUT
• Fixed frequency 370 kHz typical
• Topology – Current Mode Flyback
• 80 V for up to 120 ms transient protection
(70 V for 15 V single and dual models)
• Inhibit function
SINGLE
DUAL
±5
5
12
15
±12
±15
• Indefinite short circuit protection
• Up to 79% efficiency
Size (max.): 1.010 x 0.880 x 0.250 inches (25.65 x 22.35 x 6.35 mm)
Shown with “Gull Wing” lead option, also available with straight
leads. See Section B8, case B, for dimensions and options.
12 grams maximum
Weight:
Screening: Standard, ES, or 883 (Class H). See Section C2 for
screening options, see Section A5 for ordering information.
DESCRIPTION
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.
PROTECTION FEATURES
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 approximately 125% of full load.
MIL-STD-461
Use Interpoint’s FMGA-461 EMI filter to pass the CE03 require-
ments of MIL-STD-461C.
CONVERTER DESIGN
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.
SURFACE MOUNT PACKAGE
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).
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.
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.
INHIBIT FUNCTION
The hermetically sealed metal cases are available in two different
lead configurations. See Section B8, case B.
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.
B2-93
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