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SMRT28515Q: 产品描述Analog Circuit,; 产品类别模拟混合信号IC 信号电路; 文件大小347KB，共10页; 制造商Crane Co.

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SMRT28515Q概述

Analog Circuit,

SMRT28515Q规格参数

参数名称	属性值
包装说明	,
Reach Compliance Code	compliant
Base Number Matches	1

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EATURES

• –55°C to +125°C operation

• 19 to 56 VDC input

• Magnetic feedback

• Topology – Two-Phased Flyback

• 80 V for 100 ms transient protection

• Inhibit function and output trim

• Indefinite short circuit protection

• Radiation hardened to

3x10

neutrons/sq cm neutron

fluence

rads(Si)/sec dose rate

3x10

rads(Si) total dose

SEU 115 MeV cm

/mg

• Meets MIL-STD-704 emergency

operation and transient standards

Size (max.):

• No minimum load required

• 5 port isolated design

Weight:

Screening:

• Isolated synchronization input

PRELIMINARY

DC/DC C

ONVERTERS

28 V

OLT

NPUT

SMRT SERIES

24 TO 50 WATT

MODELS

VDC O

UTPUT

SINGLE

3.3

TRIPLE

+3.3 & ±12

+5 & ±12

+5 & ±15

DUAL

±5

±12

±15

QUAD

±5 & ±12

±5 & ±15

2.705 x 2.205 x 0.400 inches (68.71 x 56.01 x 38.23 x 10.16 mm)

See cases “S maximum dimensions” and “S1” for dimensions.

100 grams maximum

Space prototype, Class H, or Class K (MIL-PRF-38534)

Radiation hardness levels O or R

See “QA Screening: Class H and K, QML” for more information.

Available configurations: OO, HO, HR, KR

low (≤ 0.8 V) signal is applied to the TTL open collector compatible

inhibit pin. In the inhibit mode the inhibit pin current requirement is

less than –2 mA. The converter resumes normal operation when a

logic high (≥ 2.4 V) signal or open circuit is applied to the inhibit pin.

The open circuit voltage of the inhibit is 5 to 6 volts.The maximum

allowable voltage applied to the inhibit pin is 10 VDC.

DESCRIPTION

The SMRT Series™ of DC/DC converters offers up to 50 watts of

power in a radiation hardened design. The low profile SMRT

converters are manufactured in Interpoint’s fully certified and quali-

fied MIL-STD-1772 production facility and packaged in hermetically

sealed steel cases. They are ideal for use in programs requiring

high reliability, small size, and high levels of radiation hardening.

The SMRT converters are switching regulators which use a two-

phase, phase shifted flyback design with a nominal switching

frequency of 275 kHz, typical. Close regulation is maintained with

advanced constant frequency pulse width modulation design tech-

niques. The SMRT’s feed-forward compensation topology and

discontinuous topology provide high levels (80 dB nominal) of input-

to-output ripple rejection. No minimum load is required.

Two independent feedback loops are used to regulate either a

single main output and dual outputs or a configuration of two sets

of dual outputs with each set independently regulated. Each set of

outputs are electrically isolated from each other and from the input.

This product configuration eliminates cross regulation effects

between output sets. Configurations include:

• Single Output: Two-phased single output

• Dual Output: Dual outputs each with independent regulation and

isolation.

• Triple Output: One main (independent) output and two outputs

(±).

• Quad Output: Two independent sets of dual outputs

YNCHRONIZATION

An isolated sync input allows this input to be connected to any of

the devices three returns. It can be referred to the input return or

any of the output returns. Input into this pin is limited by a series 1k

ohm resistance.

UTPUT

OLTAGE

RIM

The output voltage of each set can be trimmed upward by as much

as 20% of nominal. The following are “sets” of voltages in relation

to trim:

• Triple output models: Main output is one set, the dual outputs are

another set.

• Dual outputs: Each output is a “set.”

• Single: One set

ADIATION

ARDENED

The SMRT DC/DC converters are designed to provide continuous

normal operation through radiation levels associated with proximity

to thermonuclear events. The converters will operate normally in

environments with up to 3x10

neutrons per square centimeter

neutron fluence, 10

rads (Si) per second dose rate, and 3x10

rads (Si) total dose. These levels of radiation tolerance make the

SMRT converters suitable for electronics in tactical programs where

operation in high radiation environments is required.

At the highest dose rate (10

rads (Si)/sec dose rate) there will be

an upset resulting in a dip in the voltage. This is non-destructive to

the unit. The converter will operate through the upset.

NDERVOLTAGE

OCKOUT

The converters have an undervoltage lockout that will allow power

conversion at 16 volts on a rising input voltage and a conversions

shut-down on a falling voltage at approximately 14.5 volts. Rather

than a hard shut-down, there is approximately 0.5 volts of progres-

sive turn-on and turn-off to minimize potential source impedance

oscillations for high source impedance.

NHIBIT

UNCTION

The SMRT Series incorporates an inhibit terminal that can be used

to disable internal switching. The converter is inhibited when a logic

EMI

The SMRT has a built-in EMI input filter which brings the conducted

emissions into compliance with both methods of MIL-STD-461, revi-

sions D and E, CE03 and CE102.

SMRT28515Q

SMRT28515Q概述

SMRT28515Q规格参数

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