Crane Aerospace & Electronics Power Solutions
sLH sꢂꢄglꢃ ꢀꢄꢆ dꢇꢀl dc/dc cꢈꢄvꢃꢉꢊꢃꢉꢁ
28 VoLt input – 1.5 Watt – pendinꢋ reVision c reLease
Features
2
2
smꢀll ꢁꢂzꢃ, 0.8 ꢂꢄꢅhꢃꢁ (5.16 ꢅm )
• Operating temperature -55° to +125°C
• Qualified to MIL-PRF-38534 Class H and K
• Radiation hardness assurance (RHA) to level R 100 kRad(Si)
• Input voltage range 16 to 40 VDC
• Fully isolated, magnetic feedback
• Inhibit function
• Indefinite short circuit protection
MODELS
VDC Ou t p u t
• High power density, 88% efficiency
SIꢀꢁLES
DUALS
±5
5
12
15
±12
±15
description
When used with Interpoint’s STF28-461 filter, the combination will
meet the requirements of MIL-STD-461C, CE03.
With a miniature footprint of just 0.8 square inches, the SLH
Series™ of 28 V DC/DC converters delivers 1.5 watts of output
power while saving significant board area. The wide input voltage
range of 16 to 40 VDC accepts the varying voltages of space,
military, or aerospace bus power and tightly regulates output volt-
ages to protect downstream components. Single output models
feature outputs of 5, 12, or 15 volts, and dual output models
feature outputs of ±5, ±12 and ±15 volts.
in h i b i t Fu n c t i o n
The SLH Series incorporates an inhibit terminal that can be used
to disable internal switching. The converter is inhibited when an
active low (≤ 0.5 V) signal is applied to the inhibit pin (pin 7). In
the inhibit mode the inhibit pin sources up to 2 mA maximum.
The converter resumes normal operation when an open circuit is
applied to the inhibit pin. The open circuit voltage of the inhibit is
7 to 8 volts. Do not apply an external pull-up to the converter.
Sc r e e n i n g
SLH converters offer the following screening options: Space
Prototype (O), Class H, or Class K. Radiation tolerant to
Radiation Hardness Assurance (RHA) levels of “-” (O) or “R”,
per MIL-STD-38534. Interpoint model numbers use an “O” in
the RHA designator position to indicate the “-” (dash) Radiation
Hardness Assurance level of MIL-PRF-38534, which is defined
as “no RHA”. See “Class H and K, QML Screening” tables for
more information.
Pr o t e c t i o n Fe a t u r e S
All models include a soft-start function to prevent large current
draw and minimize overshoot. The converters provide short
circuit protection (by restricting the current) and output overload
protection.
co n v e n i e n t Pa c k a g i n g
The SLH Series converters are packaged in hermetically sealed
metal cases which provide EMI/RFI shielding.
co n v e r t e r De S i g n
SLH Series DC/DC converters incorporate a flyback topology
with a variable switching frequency. Feedback provides output
voltage regulation. Output voltage is magnetically fed back to the
input side of the PWM to regulate output voltage.
Up to 80% of the load of the dual output models may be on one
output providing that the other output carries a minimum of 20%
of the total load. The dual models can be used as a single output
voltage by connecting the load between positive and negative
outputs, leaving the common unconnected resulting in double the
output voltage. (for example, SLH2805D can be used as a 10
VDC output.)
Page 1 of 10
Rev C - 20090318 - Pending Revision C Release
Crane Aerospace & Electronics
Electronics ꢁroup (Interpoint Brand)
PO Box 97005 • Redmond WA 98073-9705
425.882.3100 • power@crane-eg.com
www.interpoint.com
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