PD-94556A
ATW28XXS SERIES
28V Input, Single Output
HYBRID-HIGH RELIABILITY
DC/DC CONVERTER
Description
The ATW28XXS Series of DC/DC converters feature
high power density and an extended temperature range
for use in military and industrial applications. Designed
to MIL-STD-704 input requirements, these devices
operate with a nominal 28VDC input and are available
with single outputs at 5V,12V and 15V. The circuit design
incorporates a pulse width modulated push-pull
topology operating in the feed-forward mode at a
nominal switching frequency of 270KHz. Input to output
isolation is achieved through the use of transformers in
the forward and feedback circuits.
The advanced feedback design provides fast loop
response for superior line and load transient
characteristics and offers greater reliability and radiation
tolerance than devices incorporating optical elements
in the feedback circuits.
Three standard temperature grades are offered. Refer
to Part Number section. These devices are provided in
a flanged package for secure mounting in severe
environments.
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 can
be accommodated. Contact IR Santa Clara for special
requirements.
ATW
Features
n
n
n
n
n
n
n
n
n
n
n
n
n
19V to 40VDC Input Range (28VDC Nominal)
30W Output Power
Indefinite Short Circuit and Overload Protection
3
22.8W/in Power Density
Fast Loop Response for Superior Transient
Characteristics
Operating Temperature Range from -55°C to
+125°C Available
Popular Industry Standard Pin-Out
Resistance Seam Welded Case for Superior
Long Term Hermeticity
Efficiencies up to 83%
Shutdown from External Signal
Military Screening
250,000 hour MTBF at 85°C
Standard Microcircuit Drawings Available
www.irf.com
1
12/14/06
ATW28XXS Series
Specifications
Absolute Maximum Ratings
Input voltage
Soldering temperature
Operating case temperature
Storage case temperature
-0.5V to +50VDC
300°C for 10 seconds
-55°C to +125°C
-65°C to +135°C
ATW2805S
Table I. Electrical Performance Characteristics
Test
Symbol
Conditions
-55°C
≤
Tc
≤+125°C
Vin = 28 Vdc ±5%, C
L
= 0
Unless otherwise specified
I
OUT
= 0
V
IN
= 19, 28, and 40 V dc
V
IN
= 19, 28, and 40 V dc,
B.W. = dc to 2MHz
V
IN
= 19,28, and 40 V dc
V
IN
= 19, 28, and 40 V dc,
Iout = 0, 3000, and 6000mA
V
IN
= 19, 28, and 40 V dc,
I
OUT
= 0, 3000, and 6000mA
I
OUT
= 0, inhibit (pin 2)
tied to input return (pin 10)
I
OUT
= 0, inhibit (pin 2) = open
I
OUT
= 6000mA
B.W. = dc to 2MHz
I
OUT
= 6000mA
T
C
= +25°C
Input to output or any pin
to case (except pin 7) at 500
V dc Tc = +25°C
No effect on dc performance,
Tc = +25°C
7
Overload, T
C
= +25°C
Short circuit, T
C
= +25°C
I
OUT
= 6000mA
4000mA to/from 6000mA
500mA to/from 2500mA
Group A
Subgroups
Device
Types
Limits
Unit
Output voltage
Output current
2
Output ripple voltage
Output power
4
Line regulation
Load regulation
Input current
2
1, 3
1
V
OUT
I
OUT
V
RIP
P
OUT
VR
LINE
VR
LOAD
I
IN
I
RIP
E
FF
ISO
5, 6
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
All
All
All
All
All
All
All
All
All
All
All
All
Min
4.95
4.90
0
Max
5.05
5.10
6000
50
V
mA
mVp-p
W
mV
mV
mA
mAp-p
%
MΩ
30
5.0
20
30
18
40
20
78
100
500
12
9.0
300
270
300
+500
+500
4
Input ripple current
Efficiency
Isolation
Capacitive load
C
L
P
D
F
S
VO
TLOAD
µF
W
Power dissipation
load fault
Switching frequency
Output response to step
8
transient load changes
4,5,6
4,5,6
4,5,6
01
02
03
All
250
250
275
-500
-500
KHz
mV
pk
For Notes to Specifications, refer to page 3
2
www.irf.com
ATW28XXS Series
Table I. Electrical Performance Characteristics -
continued
Test
Symbol
ATW2805S
Device
Types
Conditions
-55°C
≤
Tc
≤+125°C
Vin = 28 Vdc ±5%, C
L
= 0
unless otherwise specified
4000mA to/from 6000mA
Group A
Subgroups
Limits
Unit
Min
Recovery time step
transient load changes
8, 9
Max
100
200
100
200
500
12
12
µs
TT
LOAD
4
5,6
4
5,6
4,5,6
4,5,6
4,5,6
All
500mA to 2500mA
Turn on overshoot
10
Turn on delay
Load fault recovery
6, 10
All
All
All
All
VTon
OS
Ton
D
Tr
LF
I
OUT
= 0 and 6000mA
I
OUT
= 0 and 6000mA
mV
pk
ms
ms
Notes to Specifications
Parameter guaranteed by line and load regulation tests.
Bandwidth guaranteed by design. Tested for 20kHz to 2.0MHz.
Above +125°C case, derate output power linearly to 0 at +135°C.
Output voltage measured at load with remote sense leads connected across load.
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.
6 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.
7 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.
8 Load step transition time between 2.0µs and 10µs.
9 Recovery time is measured from the initiation of the transient to where V
OUT
has returned to within ±1.0% of V
OUT
at 50% load.
10 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.
1
2
3
4
5
www.irf.com
3
ATW28XXS Series
Specifications
Absolute Maximum Ratings
Input voltage
Soldering temperature
Operating case temperature
Storage case temperature
-0.5V to +50VDC
300°C for 10 seconds
-55°C to +125°C
-65°C to +135°C
ATW2812S
Table II. Electrical Performance Characteristics
Test
Symbol
Conditions
-55°C
≤
Tc
≤
+125°C
Vin = 28 Vdc ±5%, C
L
= 0
Unless otherwise specified
Group A
Subgroups
Device
Types
Limits
Unit
Output voltage
Output current
2
Output ripple voltage
Line regulation
Load regulation
Input current
1
V
OUT
I
OUT
V
RIP
VR
LINE
VR
LOAD
I
IN
I
OUT
= 0
V
IN
= 18, 28, and 40 V dc
V
IN
= 18, 28, and 40 V dc,
B.W. = 20Hz to 2MHz
V
IN
= 18, 28, and 40 V dc,
Iout = 0, 1250, and 2500mA
V
IN
= 18, 28, and 40 V dc,
I
OUT
= 0, 1250, and 2500mA
I
OUT
= 0, inhibit (pin 2)
tied to input return (pin 10)
I
OUT
= 0, inhibit (pin 2) =
open
I
OUT
= 2500mA
B.W. = 20Hz to 2MHz
I
OUT
= 2500mA
Input to output or any pin
to case (except pin 7) at 500
V dc Tc = +25°C
No effect on dc
performance,
Tc = +25°C
5
Overload
Short circuit
I
OUT
= 2500mA
1250mA to/from 2500mA
1
2,3
1,2,3
1,2,3
1
2,3
1,2,3
1,2,3
All
All
All
All
All
All
Min
11.88
11.76
Max
12.12
12.24
2500
50
±30
±60
±120
18
50
V
mA
mVp-p
mV
mV
mA
Input ripple current
Efficiency
Isolation
Capacitive load
3, 4
2
I
RIP
E
FF
ISO
C
L
P
D
F
S
VO
TLOAD
1,2,3
1
2,3
1
4
1
1,2,3
4,5,6
4,5,6
All
All
All
All
All
01
02
03
All
250
250
275
-800
78
75
100
20
mAp-p
%
MΩ
200
12
9.0
300
270
300
+800
µF
W
KHz
mVpk
Power dissipation
load fault
Switching frequency
Output response to
step transient load
6
changes
0mA to/from 1250mA
-1000
+1000
For Notes to Specifications, refer to page 5
4
www.irf.com
ATW28XXS Series
Table II. Electrical Performance Characteristics -
continued
Test
Symbol
Conditions
-55°C
≤
Tc
≤
+125°C
Vin = 28 Vdc ±5%, C
L
= 0
unless otherwise specified
Group A
Subgroups
Device
Types
ATW2812S
Limits
Unit
Min
Recovery time step
6, 7
transient load changes
TT
LOAD
1250mA to/from 2500mA
4
5,6
4
5,6
4,5,6
All
Max
100
200
5.0
10
+1000
µs
0mA to 1250mA
Output response to
Transient step
Line changes
Recovery time
Transient step
Line changes
Turn on overshoot
Turn on delay
Load fault recovery
4, 9
All
All
-1000
ms
mVpk
µs
VO
TLINE
TT
LINE
VTon
OS
Ton
D
Tr
LF
Input step 18V to/ from
40V dc,
4, 8
I
OUT
= 2500mA
Input step 18V to/ from
40V dc
4, 7, 8
I
OUT
= 2500mA
I
OUT
= 0 and 2500mA
9
I
OUT
= 0 and 2500mA
4,5,6
All
500
4,5,6
4,5,6
4,5,6
All
All
All
600
12
12
mVpk
ms
ms
Notes to Specifications
1
2
3
4
5
6
7
8
9
Parameter guaranteed by line and load regulation tests.
Bandwidth guaranteed by design. Tested for 20kHz to 2.0MHz.
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.
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.
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.
Load step transition time between 2.0µs and 10µs.
Recovery time is measured from the initiation of the transient to where V
OUT
has returned to within ±1.0% of V
OUT
at 50% load.
Input step transition time between 2.0µs and 10µs.
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 2) while power is applied to the input.
www.irf.com
5
京公网安备 11010802033920号
EEWORLD
