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ADDC02805S Datasheet(PDF) 11 Page - Analog Devices

No. de pieza ADDC02805S
Descripción Electrónicos  28 V/100 W DC/DC Converter with Integral EMI Filter
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ADDC02805S Datasheet(HTML) 11 Page - Analog Devices

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OBSOLETE
ADDC02805S
REV. A
–11–
NAVMAT DERATING
NAVMAT is a Navy power supply reliability manual that is
frequently cited by specifiers of power supplies. A key section
of NAVMAT P4855-1A discusses guidelines for derating designs
and their components. The two key derating criteria are voltage
derating and power derating. Voltage derating is done to reduce
the possibility of electrical breakdown, whereas power derating
is done to maintain the component material below a specified
maximum temperature. While power deratings are typically
stated in terms of current limits (e.g., derate to x% of maximum
rating), NAVMAT also specifies a maximum junction tem-
perature of the semiconductor devices in a power supply. The
NAVMAT component deratings applicable to the ADDC02805S
are as follows:
Resistors
80% voltage derating
50% power derating
Capacitors
50% voltage and ripple voltage derating
70% ripple current derating
Transformers and Inductors
60% continuous voltage and current derating
90% surge voltage and current derating
20
°C less than rated core temperature
30
°C below insulation rating for hot spot temperature
25% insulation breakdown voltage derating
40
°C maximum temperature rise
Transistors
50% power derating
60% forward current (continuous) derating
75% voltage and transient peak voltage derating
110
°C maximum junction temperature
Diodes (Switching, General Purpose, Rectifiers)
70% current (surge and continuous) derating
65% peak inverse voltage derating
110
°C maximum junction temperature
Diodes (Zeners)
70% surge current derating
60% continuous current derating
50% power derating
110
°C maximum junction temperature
Microcircuits (Linears)
70% continuous current derating
75% signal voltage derating
110
°C maximum junction temperature
The ADDC02805S can meet all the derating criteria listed
above. However, there are a few areas of the NAVMAT
deratings where meeting the guidelines unduly sacrifices
performance of the circuit. Therefore, the standard unit makes
the following exceptions.
Common-Mode EMI Filter Capacitors: The standard
supply uses 500 V capacitors to filter common-mode EMI.
NAVMAT guidelines would require 1000 V capacitors to meet
the 50% voltage derating (500 V dc input to output isolation),
resulting in less common-mode capacitance for the same space.
In typical electrical power supply systems, where the load
ground is eventually connected to the source ground, common-
mode voltages never get near the 500 V dc rating of the
standard supply. Therefore, a lower voltage rating capacitor
(500 V) was chosen to fit more capacitance in the same space
in order to better meet the conducted emissions requirement of
MIL-STD-461D (CE102). For those applications which
require 250 V or less of isolation from input to output, the
present designs would meet NAVMAT guidelines.
Switching Transistors: 100 V MOSFETs are used in the
standard unit to switch the primary side of the transformers.
Their nominal off-state voltage meets the NAVMAT derating
guidelines. When the MOSFETs are turned off, however,
momentary spikes occur that reach 100 V. The present
generation of MOSFETs are rated for repetitive avalanche, a
condition that was not considered by the NAVMAT deratings.
In the worst case condition, the energy dissipated during
avalanche is 1% of the device’s rated repetitive avalanche
energy. To meet the NAVMAT derating, 200 V MOSFETs
could be used. The 100 V MOSFETs are used instead for their
lower on-state resistance, resulting in higher efficiency for the
power supply.
NAVMAT Junction Temperatures: The two types of power
deratings (current and temperature) can be independent of one
another. For instance, a switching diode can meet its derating
of 70% of its maximum current, but its junction temperature
can be higher than 110
°C if the case temperature of the
converter, which is not controlled by the manufacturer, is
allowed to go higher. Since some users may choose to operate
the power supply at a case temperature higher than 90
°C, it
then becomes important to know the temperature rise of the
hottest semiconductors. This is covered in the specification
table in the section entitled “Thermal Characteristics”.
EMI CONSIDERATIONS
The ADDC02805S has an integral differential- and common-
mode EMI filter that is designed to meet all applicable
requirements in MIL-STD-461D when the power converter is
installed in a typical system setup (described below). The
converter also contains transient protection circuitry that
permits the unit to survive short, high voltage transients across
its input power leads. The purpose of this section is to describe
the various MIL-STD-461D tests and the converter’s
corresponding performance. Consult factory for additional
information.
Electromagnetic interference (EMI) is governed by MIL-STD-
461D, which establishes design requirements, and MIL-STD-
462D, which defines test methods. EMI requirements are
categorized as follows (xxx designates a three digit number):
• CExxx: conducted emissions (EMI produced internal to the
power supply which is conducted externally through its input
power leads)
• CSxxx: conducted susceptibility (EMI produced external to
the power supply which is conducted internally through the
input power leads and may interfere with the supply’s
operation)
• RExxx: radiated emissions (EMI produced internal to the
power supply which is radiated into the surrounding space)
• RSxxx: radiated susceptibility (EMI produced external to the
power supply which radiates into or through the power supply
and may interfere with its proper operation)
It should be noted that there are several areas of ambiguity with
respect to CE102 measurements that may concern the systems


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