AHV2800 Datasheet, PDF (1/8 Pages) List of Unclassifed Manufacturers – Hybrid - High Reliability DC/DC Converters

LAMBDA ADVANCED ANALOG INC. λ
PRELIMINARY
AHV2800 Series
Hybrid - High Reliability
DC/DC Converters
DESCRIPTION
The AHV series of DC/DC converters are designed
to replace the AHE/ATO family of converters in
applications requiring compliance to MIL-STD-704A
through E, in particular the input surge requirement
of 80 volts specified in MIL-STD-704A. The
converters are designed to withstand transient input
voltage of 80 volts. No input voltage or output
power derating is necessary over the full military
temperature range.
These converters are packaged in an extremely
rugged, low profile package that meets all
requirements of MIL-STD-883 and MIL-PRF-38534.
Parallel seam weld sealing and the use of ceramic
pin feedthru seals assure long term hermeticity after
exposure to extended temperature cycling.
The basic circuit is a push-pull forward topology
using power MOSFET switches. The nominal
switching frequency is 500 KHz. A unique current
injection circuit assures current balancing in the
power switches. All AHV series converters use a
single stage LC input filter to attenuate input ripple
current. A low power 11.5 volt series regulator
provides power to an epitaxial CMOS custom pulse
width modulator integrated circuit. This single
integrated circuit provides all PWM primary circuit
functions. Power is transferred from primary to
secondary through a ferrite core power transformer.
An error voltage signal is generated by comparing a
highly stable reference voltage with the converter
output voltage and drives the PWM through a
unique wideband magnetic feedback circuit. This
proprietary feedback circuit provides an extremely
wide bandwidth, high gain control loop, with high
phase margin. The feedback control loop gain is
insensitive to temperature, radiation, aging, and
variations in manufacturing. The transfer function of
the feedback circuit is a function of the feedback
transformer turns ratio which cannot change when
subjected to enviromental extremes.
the requirements of MIL-PRF-38534 for class H.
The HB grade is processed and screened to the
class H requirement, but may not necessarily meet
all of the other MIL-PRF-38534 requirements, e.g.,
element evaluation and Periodic Inspection (P.I.)
not required. Both grades are tested to meet the
complete group "A" test specification over the full
military temperature range without output power
deration. Two grades with more limited screening
are also available for use in less demanding
applications. Variations in electrical, mechanical
and screening can be accommodated. Contact
Lambda Advanced Analog for special requirements.
FEATURES
n 80 Transient (100 msec max.) Absolute
Maximum Input
n 50 V_DC Absolute Maximum Input
(Continuous)
n 16-40 V_DC Input Range
n Single, Dual, and Triple Outputs
n 15 Watt Output Power (No Temperature
Derating)
n Low Input/Output Noise
n Full Military Temperature Range
n Wideband PWM Control Loop
n Magnetic Feedback
n Low Profile Hermetic Package (.405”)
n Short Circuit and Overload Protection
n Constant Switching Frequency (500 KHz)
n True Hermetic Package (Parallel Seam
Welded, Ceramic Pin Feedthru
Manufactured in a facility fully qualified to MIL-PRF-
38534, these converters are available in four
screening grades to satisfy a wide range of
requirements. The CH grade is fully compliant to