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International Rectifier Electronic Components Datasheet



AHV28xx

ADVANCED ANALOG HYBRID-HIGH RELIABILITY DC/DC CONVERTERS



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AHV28xx pdf
PD - 94583
AHV28XX SERIES
ADVANCED ANALOG
28V Input, Single, Dual and Triple Output
HYBRID-HIGH RELIABILITY
DC/DC CONVERTERS
www.DataSheet4U.com
Description
The AHV Series of DC/DC converters are designed to
replace the AHE/ATO family of converters in applica-
tions requiring compliance to MIL-STD-704A through
E, in particular the input surge requirement of 80 volts
specified 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 rug-
ged, 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 as-
sure 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 fre-
quency is 500KHz. 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 11.5volt
series regulator provides power to an epitaxial CMOS
custom pulse width modulator integrated circuit. This
single integrated circuit provides all PWM primary cir-
cuit functions. Power is transferred from primary to sec-
ondary through a ferrite core power transformer. An
error voltage signal is generated by comparing a highly
stable reference voltage with the converter output volt-
age 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, radia-
tion, aging, and variations in manufacturing. The trans-
fer function of the feedback circuit is a function of the
feedback transformer turns ratio which cannot change
when subjected to environmental extremes.
Manufactured in a facility fully qualified to MIL-PRF-
38534, these converters are available in four screen-
ing grades to satisfy a wide range of requirements.
www.irf.com
AHV
Features
n 80 Transient Input (100 msec max.)
n 50 VDC Input (Continous)
n 16 to 40 VDC Input Range
n Single, Dual and Triple Outputs
n 15 Watts 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 (0.405”)
n Short Circuit and Overload Protection
n Constant Switching Frequency (500KHz)
n True Hermetic Package (Parallel Seam
Welded, Ceramic Pin Feedthru)
The CH grade is fully compliant to the require-
ments 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., el-
ement 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 screen-
ing are also available for use in less demanding
applications. Variations in electrical, mechanical
and screening can be accommodated. Contact
Advanced Analog for special requirements.
1
11/20/02



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AHV28xx pdf
AHV28XX Series
Specifications (Single Output Models)
TCASE = -55°C to +125°C, VIN = +28V ± 5% unless otherwise specified
ABSOLUTE MAXIMUM RATINGS
Input Voltage
-0.5V to 50VDC (continuous) 80V (100ms)
Power Output
Internally limited, 17.5W typical
Soldering
Temperature Range
300°C for 10 seconds (1 pin at a time)
Operating
-55°C to +135°C
Storage
-65°C to +135°C
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TEST
SYMBOL
Condition
-55°C TC +125°C,
VIN = 28 VDC ±5%, CL=0,
unless otherwise specified
Group A
Subgroups
AHV2805S
Min Max
AHV2812S
Min Max
AHV2815S
Min Max
Units
STATIC
CHARACTERISTICS
OUTPUT
Voltage
Current
Ripple Voltage1
Power
REGULATION
Line
Load
INPUT
Current
Ripple Current
EFFICIENCY
ISOLATION
Capacitive Load 2,3
Load Fault
Power Dissipation
Switching Frequency
DYNAMIC
CHARACTERISTICS
Step Load Changes
Output Transient5
Recovery5,6
Step Line Changes
Output Transient
Recovery
TURN-ON
Overshoot
Delay
Load Fault Recovery
V
OUT
I
OUT
V
RIP
P
OUT
VRLINE
VRLOAD
I
IN
I
RIP
E
FF
ISO
C
L
P
D
F
S
V = 16, 28, and 40 VDC
IN
I =0
OUT
V = 16, 28, and 40 VDC
IN
V = 16, 28, and 40 VDC
IN
BW = DC to 1 MHz
V = 16, 28, and 40 VDC
IN
V = 16, 28, and 40 VDC
IN
I = 0, half load and full load
OUT
VIN = 16, 28, and 40 VDC
I = 0, half load and full load
OUT
I = 0, Inhibit (pin 2) = 0
OUT
I = 0, Inhibit (pin 2) = Open
OUT
I = Full load
OUT
I = Full Load
OUT
T
C
=
+25°C
Input to output or any pin to
case (except pin 8) at 500
VDC
TC = +25°C
No effect on DC performance
TC = +25°C
Overload, TC = +25°C4
Short Circuit, TC = +25°C
I = Full Load
OUT
VOT
LOAD
TT
LOAD
VOT
LINE
TT
LINE
VTon
os
T on D
TR
LF
50% Load 100% Load
135
No Load 50%
135
50% Load 100%
135
No Load 50% Load
335
50% Load No lLoad
335
Input step 16 to 40 VDC 3,7
Input step 40 to 16 VDC 3,7
Input step 16 to 40 VDC 3,6,7
Input step 40 to 16 VDC 3,6,7
I = OA and Full Load
OUT
I = O and Full Load 8
OUT
V = 16 to 40 VDC
IN
1
2,3
1,2,3
1,2,3
1,2,3
1
2,3
1,2,3
1,2,3
1,2,3,
1
1
4
1
4
4
4
4
4
4
4
4
4
4
4,5,6
4,5,6
4,5,6
4.95
4.90
0.0
15
72
100
5.05
5.10
3.00
60
5
25
50
11.88
11.76
0.0
15
12.12
12.24
1.25
60
30
60
120
14.85
14.70
0.0
15
15.15
15.30
1.00
60
35
75
150
V
V
A
mVp-p
W
mV
mV
mV
18 18 18 mA
50 50 50 mA
50 50 50 mAp-p
72 72 %
100 100 M
500 200 200 µF
8.5 8,5 8.5 W
8.5 8.5 8.5 W
450 550 450 550 450 550 KHz
-300
-500
+300
+500
70
200
5
300
-1000
800
800
550
10
10
-300
-750
+300
+750
70
1500
5
500
-1500
800
800
750
10
10
-300
-750
+300
+750
70
1500
5
500
-1500
800
800
750
10
10
mVpk
mVpk
µs
µs
ms
mVpk
mVpk
µs
µs
mVpk
ms
ms
Notes to Specifications (Single Output Models)
1. Bandwidth guaranteed by design.Tested for 20 KHz to 2 MHz.
2. Capacitive load may be any value from 0 to the maximum limit without affecting dc performance. A capacitive load in excess of the maximum limit will not disturb
loop stability but will interfere with the operation of the load fault detection circuitry, appearing as a short circuit during turn-on.
3. Parameter shall be tested as part of design characterization and after design or process changes. Thereafter shall be guaranteed to the limits specified.
4. An overload is that condition with a load in excess of the rated load but less than necessary to trigger the short circuit protection and is the condition of maximum
power dissipation.
5. Load step transition time between 2 to 10 microseconds.
6. Recovery time is measured from the initiation of the transient to where VOUT has returned to within ±1 percent of VOUT at 50 percent load.
7. Input step transition time between 2 and 10 microseconds.
8. Turn on delay time measurement is for either a step application of power at input or the removal of a ground signal from the inhinbit pin (pin 2) while power is
applied to the input. Above 125°C case temperature, derate output power linearly to 0 at 135°C case.
2 www.irf.com



Part Number AHV28xx
Description ADVANCED ANALOG HYBRID-HIGH RELIABILITY DC/DC CONVERTERS
Maker International Rectifier - International Rectifier
Total Page 9 Pages
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