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AHV2805TF PDF预览

AHV2805TF

更新时间: 2024-09-22 23:28:19
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AHV2805TF 数据手册

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LAMBDA ADVANCED ANALOG INC.  
PRELIMINARY  
AHV2800 Series  
Hybrid - High Reliability  
DC/DC Converters  
DESCRIPTION  
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.  
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.  
FEATURES  
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80 Transient (100 msec max.) Absolute  
Maximum Input  
The basic circuit is a push-pull forward topology  
using power MOSFET switches.  
The nominal  
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50 VDC Absolute Maximum Input  
(Continuous)  
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  
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16-40 VDC Input Range  
Single, Dual, and Triple Outputs  
15 Watt Output Power (No Temperature  
Derating)  
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.  
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Low Input/Output Noise  
Full Military Temperature Range  
Wideband PWM Control Loop  
Magnetic Feedback  
Low Profile Hermetic Package (.405”)  
Short Circuit and Overload Protection  
Constant Switching Frequency (500 KHz)  
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  

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