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參數(shù)資料
| 型號(hào)： | MSR2805S |
| 廠商： | CRANE ELECTRONICS INC |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | DC/DC CONVERTERS 28 VOLT INPUT |
| 中文描述： | 1-OUTPUT 3.5 W DC-DC REG PWR SUPPLY MODULE |
| 文件頁數(shù)： | 1/6頁 |
| 文件大?。?/td> | 82K |
| 代理商： | MSR2805S |
B4-27
MODELS
VDC O
UTPUT
DUAL
±12
±15
F
EATURES
–55°C to +85°C operation
16 to 32 VDC input
Fully isolated
Opto-coupler feedback
Switching frequency
Single and dual outputs
typical 80 kHz, variable freq.
Triple output - 200 kHz, fixed
Topology – Flyback
40 V for 50 ms transient protection
Inhibit function
Indefinite short circuit protection
Up to 70% efficiency
External capacitors required
SINGLE
5
TRIPLE
+5 & ±12
+5 & ±15
DESCRIPTION
The MSR Series DC/DC converters provide the high efficiencies
associated with switching regulators, yet have full isolation between
input and output. Interpoint builds the MSR converters using thick-
film hybrid technology and seals them in metal packages for military,
aerospace, and other high-reliability applications. The solder sealed
packages of the standard models pass a dip gross leak hermeticity
test. Environmentally screened models pass a fine leak hermeticity
test. See Section C2 for a complete list of screening options.
C
ONVERTER
D
ESIGN
A footprint of just over one square inch makes the MSR Series
DC/DC converters one of Interpoint’s smallest converters. These
converters incorporate a flyback topology which requires a minimum
of components resulting in small package size. Single and dual
models self-oscillate at an operating frequency which is an approx-
imate inverse function of the load. At full load, the frequency is typi-
cally 80 kHz for single and dual output models. Triple output models
operate at a fixed frequency of approximately 200 kHz. A trans-
former in the forward power circuit and an opto-coupler in the feed-
back/control loop maintain input to output isolation.
C
ONVERTER
O
PERATION
MSR Series DC/DC converters feature an input voltage range of 16
to 32 VDC and can withstand a transient of up to 40 V for up to 50
msec. They offer a choice of five different output voltage (VDC)
configurations: +5 , ±12 , ±15, +5 main with ±12 auxiliaries, and +5
main with ±15 auxiliaries. Dual output models deliver up to 4 watts
for either balanced or unbalanced loads, however, at least 25% of
the total load should be on the positive output. The single output
model supplies up to 3.5 watts of output power while the triple output
models supply up to 3.2 watts. The high efficiency remains almost
constant over the entire input voltage range and from approximately
25% of full load to full load. This makes the MSR Series converters
ideal for either battery or aircraft power applications.
I
NHIBIT
F
UNCTION
The open collector TTL compatible inhibit terminal is referenced to
input common. Inhibiting the converter by pulling the inhibit terminal
(pin 15) low results in an input current as low as 2 mA for the
MSR2805S. The inhibit terminal has an open circuit voltage of 12
to 28 V.
S
HORT
C
IRCUIT
P
ROTECTION
Each output has current limiting circuitry for indefinite short circuit
protection providing that the case temperature does not exceed the
specified limits. Under short circuit conditions the input current is
reduced to less than full load input current and the output short
circuit current remains higher than full load output current.
M
INIMAL
H
EAT
S
INKING
The MSR Series converters’ high efficiency minimizes heat sinking
requirements, but care should be taken to remove self-generated
heat to prevent exceeding the maximum case temperature. Heat
conducting material (PCB, copper sheet, heat sink, etc.) in contact
with the converter’s baseplate can help to increase heat dissipation.
The converter can be operated at full load at a case temperature of
85°C, with the output power derated linearly to zero at 115°C.
W
ARNING
: E
XTERNAL
C
APACITORS
R
EQUIRED
External capacitors are required on the outputs.
Operating the unit
without external capacitors will result in damage to the internal
circuitry.
Minimum recommended capacitor values are given in
Tables 1 and 2. For optimum performance, low ESR (Equivalent
Series Resistance) solid tantalum capacitors are required. The
specifications on the following pages are based on the use of high-
quality solid tantalums. Operation with different types of capacitors
will seriously affect performance.
DC/DC C
ONVERTERS
28 V
OLT
I
NPUT
MSR SERIES
4 WATT
Size (max.): 1.075 x 1.075 x 0.370 inches (27.31 x 27.31 x 9.40 mm).
See Section B8, case C2, for dimensions.
Weight:
20 grams maximum.
Screening: Standard or ES.See Section C2 for screening options,
see Section A5 for ordering information.
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