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MSA285R2S Datasheet Preview

MSA285R2S Datasheet

(MSA28xxS) DC/DC CONVERTERS

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MSA285R2S pdf
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



Interpoint
Interpoint

MSA285R2S Datasheet Preview

MSA285R2S Datasheet

(MSA28xxS) DC/DC CONVERTERS

No Preview Available !

MSA285R2S pdf
MSA SERIES
5 WATT
DC/DC CONVERTERS
ABSOLUTE MAXIMUM RATINGS
Input Voltage
• 16 to 40 V
Output Power
• 5 watts
Lead Soldering Temperature (10 sec per lead)
• 300°C
Storage Temperature Range (Case)
• –65°C to +135°C
INHIBIT
Inhibit TTL Open Collector
• Logic low (output disabled)
Logic low voltage 0.8 V max
Inhibit pin current 4 mA max
• Referenced to input common
• Logic high (output enabled)
Open collector
RECOMMENDED OPERATING CONDITIONS
Input Voltage Range
• 16 to 40 VDC continuous
• 50 V for up to 50 msec transient
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
TYPICAL CHARACTERISTICS
Output Voltage Temperature Coefficient
• 100 ppm/°C typical
Input to Output Capacitance
• 50 pF typical
Isolation
• 100 megohm minimum at 500 V
Audio Rejection
• 50 dB typical
Conversion Frequency
• 550 kHz typical (400 kHz 60 V model)
450 kHz min, 600 kHz max
350 kHz min, 450 kHz max 60 V model
Inhibit Pin Voltage (unit enabled)
• 9 to 11 V
Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, unless otherwise specified.
SINGLE OUTPUT MODELS
PARAMETER
CONDITIONS
OUTPUT VOLTAGE Tc = –55°C TO +125°C
OUTPUT CURRENT
Tc = –55°C TO +125°C VIN = 16 TO 40 VDC
OUTPUT POWER
VIN = 16 TO 40 VDC
Tc = –55°C TO +125°C
OUTPUT RIPPLE
VOLTAGE
LINE REGULATION
www.DataSheet4LUO.cAomD REGULATION
INPUT VOLTAGE
NO LOAD TO FULL
INPUT CURRENT
Tc = –55°C TO +125°C
INPUT RIPPLE
CURRENT
EFFICIENCY
LOAD FAULT3, 4
SHORT CIRCUIT
STEP LOAD
RESPONSE4, 5
10 kHz - 2 MHz
VIN = 16 TO 40 VDC
Tc = –55°C TO +125°C
NO LOAD TO FULL
Tc = –55°C TO +125°C
Tc = –55°C TO +125°C
CONTINUOUS
TRANSIENT 50 ms
NO LOAD
FULL LOAD
INHIBITED
10 kHz - 10 MHz
Tc = –55°C TO +125°C
POWER DISSIPATION
RECOVERY
50% - 100% - 50%
TRANSIENT
RECOVERY
STEP LINE
RESPONSE4, 5
TRANSIENT
16 TO 40 VIN
40 TO 16 VIN
RECOVERY
START-UP
16 TO 40 VIN
40 TO 16 VIN
DELAY
OVERSHOOT
MSA2805S
MSA285R2S
MSA2812S
MSA2815S
MIN TYP MAX MIN TYP MAX MIN TYP MAX MIN TYP MAX
4.95 5.00 5.05 5.15 5.20 5.25 11.88 12.00 12.12 14.85 15.00 15.15
0 — 1000 0 — 962 0 — 417 0 — 333
—— 5 — — 5 —— 5 — — 5
— 125 350 — 110 335 —
— 10 502 — 10 50 —
50 200 —
10 50 —
50 170
10 50
— 10 50 — 10 50 — 10 50 — 10 50
16 28 40 16 28 40 16 28 40 16 28 40
0 — 50 0 — 50 0 — 50 0 — 50
— 27 40 — 28 40 — 29 42 — 31 44
— 250 — — 250 — — 235 — — 235 —
—3
5 — 3 5 —3
5—3 5
— 25 100 — 25 100 — 25 100 — 25 100
— 30 150 — 30 150 — 30 150 — 30 150
66 71 — 66 71 — 70 76 — 71 76 —
— 1.5 2.0 — 1.5 2.0 — 1.2 1.9 — 1.2 1.8
— 12.5 25 — 1.5 25 — 1 10 — 1 10
— 100 250 — 100 250 — 150 375 — 200 500
— 100 250 — 100 250 — 200 500 — 200 500
— 50 150 — 50 150 — 80 200 — 50 125
— 50 150 — 50 150 — 100 250 — 50 125
— 100 250 — 100 250 — 250 625 — 250 625
— 200 500 — 200 500 — 250 625 — 250 625
— 10 25 — 10 25 — 3 10 — 3 10
— 0 50 — 0 50 — 0 120 — 0 150
MSA2860S1
MIN TYP MAX
59.1 60.00 60.9
0 — 20
— — 1.2
— — 300
— — 300
— — 300
16 28 40
0 — 50
— — 30
— 72 —
—35
— — 90
— ——
70 75 —
— ——
— ——
— ——
— ——
— ——
— ——
— ——
— ——
— ——
— ——
UNITS
VDC
mA
W
mV p-p
mV
mV
VDC
V
mA
mA p-p
%
W
ms
mV pk
µs
mV pk
µs
ms
mV pk
Notes
1. MSA2860S specifications are at 25°Tc only, contact your Interpoint
representative for more information on over temperature specs.
2. Line regulation for /ES and non /ES 2805S models at 16 to 17 VIN and 110
°C to 125°C (case) is 5% (max).
3. Indefinite short circuit protection not guaranteed above 125°C (case).
4. Recovery time is measured from application of the transient to point at which
VOUT is within 1% of VOUT at final value.
5. Transition time >10µs.
2


Part Number MSA285R2S
Description (MSA28xxS) DC/DC CONVERTERS
Maker Interpoint
Total Page 8 Pages
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