SLH SERIES
1.5 WATT
DC/DC CONVERTERS
28 VOLT NPUT
I
FEATURES
• Fully qualified to Class H or K
• Radiation hardened
• -55°C to +125°C operation
• 16 to 40 VDC input voltage range
• Fully isolated
MODELS
VDC OUTPUT
SINGLE
DUAL
±5
3.3
5
12
15
• Magnetic feedback
±12
±15
• Variable operating frequency
• Topology –
Self Oscillating Flyback
• Inhibit function
Size (max.): 0.975 x 0.800 x 0.270 inches (24.77 x 20.32 x 6.86 mm)
See Section B8, case A2, for dimensions.
• Indefinite short circuit protection
Weight:
12 grams max.
Screening: Standard, Class H, or Class K (MIL-PRF-38534)
Radiation hardness levels O, L, and R
See Section C2 for screening and radiation hardness
options, see Section A5 for ordering information.
DESCRIPTION
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, mili-
tary, or aerospace bus power and tightly regulates output voltages
to protect downstream components. Single output models feature
outputs of 3.3, 5, 12, or 15 volts, and dual output models feature
outputs of ±5, ±12 and ±15 volts.
connecting the load between positive and negative outputs, leaving
the common unconnected resulting in double the output voltage.
(ex: SLH2805D can be used as a 10 VDC output.)
When used with Interpoint’s STF filter, the combination will meet the
requirements of MIL-STD-461C, CE03.
INHIBIT FUNCTION
When an open collector TTL logic low is applied to the inhibit
terminal, pin 7, the converter shuts down and lowers the output
voltage to near zero and input current to as low 5 mA. Leaving the
terminal open or applying an open collector TTL logic high will
enable the converter.
SCREENING AND REPORTS
SLH converters offer three screening options – Standard, Class H,
or Class K – and three levels of radiation hardness. See Section C2,
Quality Assurance, pages C2-7 through C2-9, for descriptions.
Detailed reports on product performance are also available and are
listed on page C2-9.
PROTECTION FEATURES
All models include a soft-start function to prevent large current draw
and minimize overshoot. The converters provide short circuit protec-
tion (by restricting the current) and output overload protection.
CONVERTER DESIGN
SLH Series DC/DC converters incorporate a flyback topology with a
variable frequency of approximately 370 kHz. Feedback provides
output voltage regulation. Output voltage is magnetically fed back to
the input side of the PWM to regulate output voltage. Regulation is
also affected by the load.
CONVENIENT PACKAGING
The SLH Series converters are packaged in hermetically sealed
metal cases which provide EMI/RFI shielding.
For more information, contact your Interpoint representative
listed in Section A5.
Dual models regulate the negative output with magnetic coupling to
the positive output. Up to 80% of the load 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
All technical information is believed to be accurate, but no responsibility is
assumed for errors or omissions. Interpoint reserves the right to make changes in
products or specifications without notice. SLH Series is a trademark of Interpoint.
Copyright © 1999 Interpoint. All rights reserved.
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