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PDF AHF2800 Data sheet ( Hoja de datos )
| Número de pieza | AHF2800 | |
| Descripción | High Reliability DC/DC Converters | |
| Fabricantes | ETC | |
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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
requirements of MIL-STD-704D. The basic circuit
utilizes a pulse width modulated, feed-forward
topology at a nominal switching frequency of 550
KHz. Input to output isolation 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 50 kHz, resulting in superior line
and load transient characteristics. This feedback
method is also inherently temperature 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
certified to MIL-PRF-38534. All processes used to
manufacture these converters have been qualified
to enable Lambda Advanced Analog to deliver
compliant devices. Four screening grades are
available to satisfy a wide range of requirements.
The CH grade converters are fully compliant to
MIL-PRF-38534 class H. The HB grade
converters are processed to full MIL-PRF-38534
screening but do not have class H element
evaluation as required by MIL-PRF-38534. Two
grades are fully tested and operate over the full
military temperature range without derating of
output power. Industrial and commercial grades
are also available. Variations in electrical,
mechanical and screening can be accommodated.
Extensive computer simulation using complex
modeling enables rapid design modification to be
provided. Contact Lambda Advanced Analog with
specific requirements.
AHF2800 Series
Hybrid - High Reliability
DC/DC Converters
FEATURES
s 16 - 40 VDC input range
(28 VDC nominal)
s Single and dual outputs
s 12 watts output power
s 22.8 W/in3 power density
s Low input/output noise
(50 mA/60 mV p-p max. respectively)
s Indefinite short circuit and overload
protection
s Wideband control loop for superior
transient characteristics
s No derating for -55°C to +125°C
operation
s Constant switching frequency
(550 kHz nominal)
1 page  
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TABLE III. Electrical Performance Characteristics - Continued
AHF2815S
Test
Symbol
Conditions
-55°C ≤ TC ≤ +125°C
VIN = 28 V dc ±5%, CL = 0 unless
otherwise specified
Output response to step
transient load changes 6/
VOTLOA
D
1000 mA to/from 2000 mA
0 mA to/from 1000 mA
Recovery time, step
transient load changes
6/ 7/
TTLOAD 1000 mA to/from 2000 mA
0 mA to/from 1000 mA
Output response to
transient step line changes
VOTLINE Input step 18 V to/from
40 V dc, IOUT = 2000 mA 4/ 8/
Recovery time transient
step line changes
TTLINE
Input step 18 V to/from 40 V dc
IOUT = 2000 mA 4/ 7/ 8/
Turn on overshoot
VTonOS IOUT = 0 and 2000 mA
Turn on delay
TonD
IOUT = 0 and 2000 mA 9/
Load fault recovery 4/ 9/
Weight
TrLF
Group A
Subgroups
Device
types
4,5,6
4,5,6
4
5,6
4
5,6
4,5,6
4,5,6
4,5,6
4,5,6
4,5,6
All
All
All
04
05
06
04
05
06
All
All
All
Limits
Unit
Min
-800
-1000
Max
+800 mV pk
+750
100 µs
-1000
200
5 ms
10
+1000 mV pk
500 µs
750 mV pk
12 ms
12 ms
38 grams
Notes:
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 load 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 III.
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 2)
while power is applied to the input.
5
5 Page 
Thermal Management
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Assuming that there is no forced air flow, the
package termperature rise above ambient (∆T) may
be calculated using the following expression:
STANDARDIZED MILITARY DRAWING
CROSS REFERENCE
Model
AHF2805S/CH
AHF2812S/CH
Drawing Number
SMD #5962-91600
SMD #5962-94568
≈∆T 80 A -0.7 p 0. 85 ( °C)
AHF2815S/CH
AHF2812D/CH
SMD #5962-94563
SMD #5962-92111
where A = the effective surface area in square
AHF2815D/CH
SMD #5962-92351
inches (including heat sink if used;) P = power
dissipation in watts.
PART NUMBER
The total surface area of the AHF package is 4.9
square inches. If a worse case full load efficiency of
78% is assumed, then the case temperature rise
can be calculated as follows:
Model
Input Voltage
AHF 28 xx x F/ x
[ ] [ ]P = P
OUT
1
EFF
-
1
= 12
1
.78
-
1
= 3.4 W
∆T = 80 (4.9)-0.7 (3.4)0.85 = 74°C
Output Voltage
05— 5V DC
12—12V DC
15—15V DC
Hence, if TAMBIENT = +25°C, the DC/DC converter
case temperature will be approximately 100°C if no
heat sink or air flow is provided.
S—Single
D—Dual
To calculate the heat sink area required to maintain
a specific case temperature rise, the above equa-
tion may be manipulated as follows:
Screening (see table)
Omit for -20°C to +85°C
ES -55°C to +125°C
HB— -55°C to +125°C
CH— Class H complaint
See table for standard
Mlitary drawing number
Package Option
Omit For Standard
F-Flange
A =[
HEAT SINK
∆T
] -1.43 - A
PKG
80P 0.85
As an example, if a maximum case temperature
rise of 50°C above ambient is desired, then the
required effective heat sink area is:
A =HEAT SINK [ 50
] -1.43 -4.9 = 3.75 in.2
80 (3.4) 0.85
Available Screening Levels and Process Variations for AHF Series
R e quir e me nt
M IL-STD-883
M ethod
No
Suffix
ES
Suffix
HB
Suffix
CH
Suffix
Temperature Range
-20 to +85°C -55°C to +125°C -55°C to +125°C -55°C to +125°C
Element Evaluation
MIL-PRF-38534
Internal Visual
2017
*
Yes Yes
Yes
Temperature Cycle
1010
Cond B
Cond C
Cond C
Constant Acceleration
2001
500g
Cond A
Cond A
Burn-in
1015
96hrs @ 125°C 96hrs @ 125°C 160hrs @ 125°C 160hrs @ 125°C
Final Electrical (Group A) MIL-PRF-38534
25°C
25°C
-55, +25, +125°C -55, +25, +125°C
Seal, Fine & Gross
1014
*
Cond A, C
Cond A, C
Cond A, C
External Visual
2009
*
Yes Yes
Yes
* Per Commercial Standards
11
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| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet AHF2800.PDF ] | |
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