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PDF AHF2812S Data sheet ( Hoja de datos )
| Número de pieza | AHF2812S | |
| Descripción | Single and Dual Output | |
| Fabricantes | International Rectifier | |
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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
1 page  
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AHF28XX Series
Table II. Electrical Performance Characteristics - continued
AHF2812S
Test
Output response
to step transient
load changes6
Recovery time
step transient
load changes6,7
Output response
to transient step
line changes
Recovery time
transient step
line changes
Turn on
overshoot
Turn on delay
Symbol
Conditions
-55°C ≤ Tc ≤ +125°C
Vin = 28 Vdc ±5%, CL = 0
unless otherwise specified
VOTLOAD
50 mA to/from 1000mA
0 mA to/from 500mA
TTLOAD
50 mA to/from 1000mA
0 mA to 500 mA
500 mA to 0 mA
VOTLINE
Input step 16 V to/from
40 V dc, IOUT =1000mA 4, 8
TTLINE
Input step 16 V to/from 40Vdc
IOUT =1000mA 4, 7, 8
VTonOS IOUT = 0 and 1000mA
TonD
IOUT = 0 and 1000mA 9
Group A Device
Subgroups Types
4
5,6
4
5,6
4,5,6
4,5,6
4,5,6
4,5,6
01
01
01
4,5,6
01
4,5,6
4,5,6
01
01
Limits
Min Max
-300
-450
-500
-750
+300
+450
+500
+750
100
1500
10
1500
800
600
20
Unit
mV pk
µs
ms
mV pk
µs
mV pk
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 II.
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
a ground signal from the inhibit pin (pin 1) while power is applied to the input is unlimited.
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AHF28XX Series
Table V. Electrical Performance Characteristics - continued
AHF2812D
Test
Power dissipa-
tion load fault
Switching
frequency4
Output response
to step transient
load changes4,9
Symbol
PD
Conditions
-55°C ≤ Tc ≤+125°C
Vin = 28 Vdc ±5%, CL = 0
unless otherwise specified
Overload, TC = +25°C 8
Short circuit, TC = +25°C
FS
VOTLOAD
IOUT = 1000mA
500 mA to/from 1000mA
0 mA to/from 500 mA
Recovery time
step transient load
changes4,9,10
Output response
transient step line
changes4,7,11
TTLOAD
VOTLINE
500 mA to/from 1000mA
0 mA to/from 500 mA
Input step from/to 16 to
40 V dc, IOUT =1000mA
Group A
Subgroups
1,2,3
4,5,6
4,5,6
4,5,6
4,5,6
4,5,6
4,5,6
Device
Types
01
01
01
01
01
Limits
Min Max
6
2
Unit
W
500
-200
-800
-750
600
+200
+800
70
1000
+750
kHz
mV pk
µs
mV pk
Recovery time
transient step line
changes4,7,10,11
Turn on
overshoot4
Turn on delay4,12
Load fault
recovery7
Weight
TTLINE
VTonOS
TonD
Input step from/to 16 to 40 V
dc, IOUT =1000mA
IOUT =0 and 1000mA
IOUT = 0 and 1000mA
TrLF
4,5,6
4,5,6
4,5,6
4,5,6
01
01
01
01
1200
µs
600 mV pk
25 ms
25 ms
38 grams
Notes to Specifications
1. Parameter guaranteed by line load and cross regulation tests.
2. Up to 90 percent of full power is available from either output provided the total output does not exceed 12W.
3. Bandwidth guaranteed by design. Tested for 20 kHz to 2 MHz.
4. Load current split equally between +VOUT and –VOUT.
5. 1.2 watt load on output under test, 1.2 watt to 10.8 watt load change on other output.
6. Capacitive load may be any value from 0 to the maximum limit without compromising dc performance.
A capacitive oad 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.
7. 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 V.
8. 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.
9. Load step transition time between 2 and 10 microseconds.
10. 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.
11. Input step transition time between 2 and 10 microseconds.
12. Turn-on delay time measurement is for either a step application of power at the input or the removal of
a ground signal from the inhibit pin (pin 1) while power is applied to the input.
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| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet AHF2812S.PDF ] | |
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