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International Rectifier Electronic Components Datasheet

AHF2805S Datasheet

Single and Dual Output

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PD - 94541
ADVANCED ANALOG
HYBRID-HIGH RELIABILITY
DC/DC CONVERTERS
AHF28XX SERIES
28V Input, Single and Dual Output
Description
The AHF Series of DC/DC converters feature single or
dual outputs over the full military temperature range.
No derating in output power is required, making them
suitable for use in rugged military applications. The low
profile, small outline package is ideally suited to the
tight board space requirements of many industrial and
aerospace applications. Designed for nominal 28Vdc
inputs, this family of converters will meet the require-
ments of MIL-STD-704D. The basic circuit utilizes a
pulse width modulated, feed-forward topology at a nomi-
nal switching frequency of 550KHz. Input to output iso-
lation is achieved through the use of transformers in
the forward and feedback circuits.
The proprietary magnetic feedback circuit provides for
an extremely wide bandwidth control loop with a high
phase margin. The closed loop frequency response of
this converter family extends to approximately 50KHz,
resulting in superior line and load transient character-
istics. This feedback method is also inherently tem-
perature and radiation insensitive. This gives the AHF
Series an important advantage over converters that
incorporate opto-couplers in their design.
These converters are manufactured in a facility certi-
fied to MIL-PRF-38534. All processes used to manu-
facture these converters have been qualified to enable
Advanced Analog to deliver compliant devices. Four
screening grades are available to satisfy a wide range
of requirements.The CH grade converters are fully com-
pliant to MIL-PRF-38534 class H. The HB grade con-
verters are processed to full MIL-PRF-38534 screen-
ing but do not have class H element evaluation as re-
quired by MIL-PRF-38534. Two grades are fully tested
and operate the full military temperature range without
derating of output power. Industrial and commercial
grades are also available. Variations are electrical,
mechanical and screening can be accommodated.
AHF
Features
n 16 to 40 VDC Input Range (28 VDC Nominal)
n Single and Dual Outputs
n 12 Watts Output Power
n 22.8 W/in3 Power Density
n Low Input / Output Noise
(50mA/60mVp-p max. respectively)
n Indefinite Short Circuit and Overload
Protection
n Wideband Control Loop for
Superior Transient Characterstics
n No Derating for -55°C to +125°C Opertation
n Constant Switching Frequency
(550KHz Nominal)
Extensive computer simulation using complex
modeling enables rapid design modification to
be provided. Contact Advanced Analog with spe-
cific requirements.
www.irf.com
1
10/08/02



International Rectifier Electronic Components Datasheet

AHF2805S Datasheet

Single and Dual Output

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AHF2805S pdf
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AHF28XX Series
Specifications
n ABSOLUTE MAXIMUM RATINGS
Input Voltage
Soldering Temperature
Case Temperature
-0.5V to 50V
300°C for 10 seconds
Operating -55°C to +125°C
Storage -65°C to +135°C
Table I. Electrical Performance Characteristics
AHF2805S
Test
Output voltage
Symbol
Conditions
-55°C Tc +125°C
Vin = 28 Vdc ±5%, CL = 0
Unless otherwise specified
VOUT
IOUT = 0
Output current1
Output ripple
voltage2
Line regulation
Load regulation
Input current
Input ripple current2
Efficiency
IOUT
VRIP
VR
LINE
VRLOAD
IIN
I
RIP
EFF
VIN = 16, 28, and 40 V dc
VIN = 16, 28, and 40 V dc,
B.W. = 20 Hz to 2MHz
V = 16, 28, and 40 V dc,
IN
Iout = 0, 500, and 1000 mA
VIN = 16, 28, and 40 V dc,
I = 0, 500, and 1000 mA
OUT
IOUT = 0, inhibit (pin 1)
tied to input return (pin 7)
I = 0,
OUT
inhibit (pin 1) = open
I = 1000mA
OUT
B.W. = 20 Hz to 2MHz
IOUT = 1000mA
Isolation
Capacitive load3,4
ISO Input to output or any pin
To case (except pin 6) at
500V dc Tc = +25°C
CL No effect on dc
performance, Tc = +25°C
Group A
Subgroups
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
4
Device
Types
01
01
01
01
01
01
01
01
01
01
Limits
Min Max
Unit
4.95
4.90
5.05
5.10
V
2400
mA
60 mV p-p
25 mV
50 mV
12
mA
30
50 mA p-p
76 %
74
100 M
500 µF
Power dissipation
load fault
Switching
frequency
PD Overload 5
Short circuit
FS IOUT = 1000mA
1
1,2,3
4,5,6
01 6 W
01 2
01
500 600
kHz
For Notes to Specifications, refer to page 3
2
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International Rectifier Electronic Components Datasheet

AHF2805S Datasheet

Single and Dual Output

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AHF28XX Series
Table I. Electrical Performance Characteristics - continued
AHF2805S
Conditions
Test
Symbol
-55°C Tc +125°C
Vin = 28 Vdc ±5%, CL = 0
unless otherwise specified
Output response to
step transient load
changes6
VOTLOAD
1200 mA to/from 2400mA
0 mA to/from 1200mA
Group A Device
Subgroups Types
Limits
Min Max
4,5,6
01 -300 +300
4,5,6
-500 +500
Unit
mV pk
mV pk
Recovery time step
transient load
changes6.7
TTLOAD
1200 mA to/from 2400mA
0 mA to 1200 mA
500 mA to 0 mA
4,5,6
4,5,6
4,5,6
01
70
1200
8
µs
ms
ms
Output response to
transient step line
changes
Recovery time
transient step line
changes
Turn on overshoot
Turn on delay
VOTLINE
TTLINE
VTonOS
TonD
Input step 16 V to/from
40 V dc, IOUT = 2400mA 4, 8
Input step 16 V to/from 40Vdc
IOUT = 2400mA 4, 7, 8
IOUT = 0 and 2400mA
IOUT = 0 and 2400mA 9
4,5,6
4,5,6
4,5,6
4,5,6
01
01
01
01
500 mV pk
800 µs
600 mV pk
20 ms
Load fault
recovery4,9
Weight
TrLF
4,5,6
01
20 ms
35 grams
Notes to Specifications
1. Parameter guaranteed by line and load regulation tests.
2. Bandwidth guaranteed by design. Tested for 20 kHz to 2 MHz.
3. Capacitive load may be any value from 0 to the maximum limit without compromising dc performance.
A capacitive in excess of the maximum limit will not disturb loop stability but may interfere with the
operation of the load fault detection circuitry, appearing as a short circuit during turn-on.
4. Parameter shall be tested as part of design characterization and after design or process changes.
Thereafter, parameters shall be guaranteed to the limits specified in Table I.
5. An overload is that condition with a load in excess of the rated load but less than that necessary to
trigger the short circuit protection and is the condition of maximum power dissipation.
6. Load step transition time between 2 and 10 microseconds.
7. 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.
8. Input step transition time between 2 and 10 microseconds.
9. Turn-on delay time measurement is for either a step application of power at the input or the removal of
ground signal from the inhibit pin (pin 1) while power is applied to the input is unlimited.
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3




Part Number AHF2805S
Description Single and Dual Output
Maker International Rectifier
Total Page 17 Pages
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