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ASA2805S

HYBRID-HIGH RELIABILITY DC/DC CONVERTER



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ASA2805S pdf
PD-94539A
HYBRID-HIGH RELIABILITY
DC/DC CONVERTER
Description
The ASA28XXS Series of DC/DC converters are high
reliability thick film hybrid converters that use flyback
topology operating at a nominal frequency of 550KHz.
High input to output isolation is achieved through the
use of transformers in the flyback power and feedback
circuits.
The advanced feedback design provides fast loop
response for superior line and load transient
characteristics and offers greater reliability than devices
incorporating optical feedback circuits.
This device is designed to meet MIL-STD-704D input
requirements offering full performance over a 16V to
40V input range. Output Power of up to 5W is available.
Connecting the inhibit pin (pin 5) to the input common
(pin 7) will cause the converter to shut down. It is
recommended that the inhibit pin be driven by an open
collector device capable of sinking at least 400µA. The
open circuit voltage of the inhibit pin is 11.5 ± 0.5V.
Manufactured in a facility fully qualified to MIL-PRF-
38534, these converters are fabricated utilizing DSCC
qualified processes. For available screening options,
refer to device screening table in the data sheet.
Variations in electrical, mechanical and screening
requirements can be accommodated. Extensive
computer simulation using complex modeling allows
design modifications to be examined. Contact IR Santa
Clara with specific requirements.
ASA28XXS SERIES
28V Input, Single Output
ASA
Features
Up To 5.0W Output Power
5V, 12V,15V Outputs
High Reliability
Wide Input Voltage Range -16V To 40V
Indefinite Short Circuit and Overload Protection
Popular Industry Standard Pin-Out
Military Screening Available
Parallel Seam Welded Package
No External Capacitors Required
Input Voltage Surge Protected to MIL-STD-704A
Under Voltage Lockout
Available as Standard Military Drawing
Standard Microcircuit Drawings Available
www.irf.com
1
01/11/07
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ASA2805S pdf
ASA28XXS Series
Specifications
Absolute Maximum Ratings
Input voltage
Power output
Soldering temperature
Operating case temperature
Storage case temperature
-0.5V to +50VDC Continous, 80V, 100 msec
Internally limited ( 6.5W typical )
300°C for 10 seconds
-55°C to +125°C
-65°C to +135°C
TEST
Output voltage
Output current 1
Output ripple voltage 2
Line regulation
Load regulation
Input current
Input ripple current 2
Conditions
-55° TC +125°C
VIN = 28V dc ±5% CL = 0
unless otherwise specified
IOUT = 0
VIN = 16, 28, and 40 V dc
VIN = 16, 28 and 40 V dc
VIN = 16, 28, and 40 V dc
IOUT = 0, 50%, 100% IMAX
VIN = 16, 28, and 40 V dc
IOUT = 0, 50%, 100% IMAX
IOUT = 0 Pin 5 to Pin 7
IOUT = 0 Pin5 open
IOUT = IMAX
Group A
Subgroups
1
2, 3
1, 2, 3
1
2, 3
1
2, 3
1
2, 3
1, 2, 3
1, 2, 3
Efficiency
IOUT = IMAX
Isolation - Input to output
or any pin to case
Capacitive load 3, 4
Power dissipation, load
fault
Switching frequency 4
VTEST 500 Vdc, Tc= +25°C
No effect on dc
performance, Tc = +25°C
Overload 5
Short circuit
IOUT = IMAX
1
2, 3
1
4
1, 2, 3
4, 5, 6
Output response to step
transient load changes 6
½ IMAX IMAX
0 mA IMAX
Recovery time, step
transient load changes
Output response
transient step line
changes 4 8
IOUT = IMAX
0 mA ½ IMAX
Input step 16
IOUT = IMAX
40 V dc
4
5, 6
4
5, 6
4, 5, 6
4, 5, 6
Recovery time transient
step line changes 4, 7, 8
Input step 16
IOUT = IMAX
40 V dc
4, 5, 6
Turn on overshoot
Turn on delay 9
IOUT = 0 mA, IMAX
IOUT = 0 or IMAX
Load fault recovery 4
For Notes to Specifications, refer to page 3
4, 5, 6
4, 5, 6
4, 5, 6
2
ASA2805S/xx
Min
4.95
4.90
66
Max
5.05
5.10
1000
190
475
25
50
25
50
18
50
100
100
500
-300
-450
-500
-750
500
4.0
2.0
600
+300
+450
+500
+700
200
1.0
500
800
600
20
20
ASA2812S/xx
Min
11.88
11.76
71
68
100
Max
12.12
12.24
417
200
290
±25
±50
±25
±50
18
50
100
200
4.0
2.0
500 600
-450 +450
-750
+750
100
1.0
1000
800
600
25
25
ASA2815S/xx
Min
14.85
14.70
71
68
100
Max
15.15
15.30
333
200
290
±25
±50
±25
±50
18
50
100
Unit
V
mA
mV PP
mV
mV
mA
mA PP
%
M
200 µF
4.0 W
2.0
500 600 KHz
-400
-800
+450
+750
mV pk
100
1.0
1000
µs
ms
mV pk
800 µs
600 mV pk
25 ms
25 ms
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Part Number ASA2805S
Description HYBRID-HIGH RELIABILITY DC/DC CONVERTER
Maker IRF - IRF
Total Page 5 Pages
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