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MSA2860S 데이터시트 PDF




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부품번호 MSA2860S 기능
기능 (MSA28xxS) DC/DC CONVERTERS
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MSA2860S 데이터시트, 핀배열, 회로
FEATURES
• –55° to +125°C operation
DC/DC CONVERTERS
• 16 to 40 VDC input
• Fully isolated
28 VOLT INPUT
• Optocoupler feedback
• Fixed frequency, 550 kHz typical
(400 kHz typ. 60 V output model)
• Topology – Flyback
• 50 V for up to 50 ms transient protection
• Inhibit function
• Indefinite short circuit protection
• Up to 76% efficiency, 16 W/in3
Size (max.): 1.075 x 1.075 x 0.270 inches (27.31 x 27.31 x 6.86 mm)
Weight:
15 grams maximum.
Screening: Standard, ES, or 883 (Class H).
MSA SERIES
5 WATT
MODELS
VDC OUTPUT
SINGLE
5
5.2
12
15
60
DUAL
±5
±12
±15
DESCRIPTION
The MSA Series™ of high frequency DC/DC converters offers a new
standard of performance for low power, military/aerospace grade
DC/DC converters. MSA parts provide up to 5 watts output power
over the full military temperature range with up to 76% efficiency.
Thick-film hybrid techniques provide military/aerospace reliability
levels and optimum miniaturization. The hermetically sealed case is
only 1.075 by 1.075 inches — with a height of only 0.270 inches.
Power density for the MSA Series parts is 16 watts per cubic inch.
www.DataSheet4TUh.ceomMSA Series’ small size, low height, and hermetically sealed
metal enclosures make them ideal for use in military, aerospace and
other high reliability applications. Units are available with standard,
screening, “ES”, and fully compliant SMD “883” screening. See
page 8 for screening options and descriptions.
CONVERTER DESIGN
The MSA converters are switching regulators that use a flyback
converter design with a constant switching frequency of 550 kHz.
They are regulated, isolated units using a pulse width modulated
topology and built as high reliability thick-film hybrids. Isolation
between input and output circuits is provided with a transformer in
the forward power path and an optical link in the feedback control
loop. Excellent input line transient response and audio rejection is
achieved by an advanced feed-forward compensation technique.
Negative output regulation is maintained by tightly coupled
magnetics. Up to 4 watts, 80% of the total output power, is available
from either output, provided that the opposite output is simultane-
ously carrying 20% of the total power. Each output must carry a
minimum of 20% of the total output power in order to maintain spec-
ified regulation on the negative output. Predictable current limit is
accomplished by direct monitoring of the output load current, which
results in a constant current output above the overload point.
Internal input and output filters eliminate the need for external
capacitors.
WIDE VOLTAGE RANGE
The MSA converters are designed to provide full power operation
over a full 16 to 40 VDC voltage range. Operation below 16 volts,
including MIL-STD-704E emergency power conditions is possible
with derated power. Please refer to the low line dropout graphs
(Figures 17 and 18) for details. A low voltage lockout feature keeps
the converter shutdown below approximately 13 VDC to ensure
smooth initialization.
IMPROVED DYNAMIC RESPONSE
The MSA feed-forward compensation system provides excellent
dynamic response and noise rejection. Audio rejection is typically 50
dB. The minimum to maximum step line transient response is typi-
cally less than 1%.
INHIBIT FUNCTION
MSA converters provide a TTL open collector-compatible inhibit
feature that can be used to disable internal switching and inhibit the
unit’s output. Inhibiting in this manner results in low standby current,
and no generation of switching noise.
The converter is inhibited when the TTL compatible low (0.8 V) is
applied to the inhibit pin. The unit is enabled when the pin, which is
internally connected to a pull-up resistor, is left unconnected or is
connected to an open collector gate. The open circuit output voltage
associated with the inhibit pin is 9 to 11 V. In the inhibit mode, a
maximum of 4 mA must be sunk from the inhibit pin.
UNDERVOLTAGE LOCKOUT AND TRANSIENT
PROTECTION
Undervoltage lockout helps keep system current levels low during
initialization or re-start operations. They can withstand short term
transients of up to 50 volts without damage.
1




MSA2860S pdf, 반도체, 판매, 대치품
MSA SERIES
5 WATT
www.DataSheet4U.com
DC/DC CONVERTERS
PIN OUT
Pin Single Output Dual Output
1 Positive Output Positive Output
2 Output Common Output Common
3 No connection Negative Output
4 No connection No connection
5 Inhibit
Inhibit
6 Positive Input Positive Input
7 Input Common Input Common
8 Case Ground Case Ground
Squared corner and dot on top
of package indicate pin one.
12345
BOTTOM VIEW
MSA
876
See page 7 for dimensions.
FIGURE 1: PIN OUT BOTTOM VIEW
MODEL NUMBERING KEY
Base Model
MSA 28 12
Input Voltage
Output Voltage
(R = decimal point, 5R2 = 5.2 Vout)
D / 883
Number of Outputs
(S = single, D = dual)
Screening
(Standard screening has no designator
in this position.)
SMD NUMBERS
STANDARD MICROCIRCUIT
DRAWING (SMD)
MSA SERIES
SIMILAR PART
5962-9309201HXC
IN PROCESS
5962-9309301HXC
5962-9309401HXC
5962-0052201HXC
5962-9308901HXC
5962-9309001HXC
MSA2805S/883
MSA285R2S/883
MSA2812S/883
MSA2815S/883
MSA2860S/883
MSA2812D/883
MSA2815D/883
For exact specifications for an SMD product, refer to the SMD
drawing. Call your Interpoint representative for status on
MSA SMD releases. 883suffix indicates SMD similar part.
SMDs can be downloaded from:
http://www.dscc.dla.mil/programs/smcr
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MSA2860S 전자부품, 판매, 대치품
DC/DC CONVERTERS
Dot on top of case
indicates pin one
CASE C
BOTTOM VIEW
See Figure 20
for pin configurations.
1.075 max
(27.31)
Materials
Header Cold Rolled Steel/Nickel/Gold
Cover Cold Rolled Steel/Nickel
Pins Copper/Nickel/Gold
1.075 max
compression glass seal
(27.31)
Case dimensions in inches (mm)
Tolerance
±0.005 (0.13) for three decimal places
±0.01 (0.3) for two decimal places
unless otherwise specified
CAUTION
Heat from reflow or wave soldering may
damage the device. Solder pins
individually with heat application not
exceeding 300°C for 10 seconds per
pin.
FIGURE 19: CASE C MAXIMUM DIMENSIONS
MSA SERIES
5 WATT
www.DataSheet4U.com
BOTTOM VIEW CASE C1
MSA Series: Screening Standard, ES, or 883
Seam Seal
Projection Weld
0.932
(23.67)
0.025
(0.64)
dia.
Squared corner and dot on
top of case indicate pin one.
12345
0.132
8
7
6
(3.35)
0.000
FIGURE 20: CASE C1
Note: Although every effort has been made to render the case drawings at actual size, variations in the printing process may cause some distortion. Please refer
to the numerical dimensions for accuracy.
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MSA2860S

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