PD-97418
ATW28300S
HYBRID HIGH-RELIABILITY
DC-DC CONVERTER
Description
The ATW28300S DC-DC converter features high
power density and an extended temperature range
for use in military and industrial applications.
Designed to MIL-STD-704D input requirements, this
device operates with a nominal 28V
DC
input with an
adjustable output of 150 to 300V via external
potentiometer. 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 than
devices incorporating optical feedback circuits.
Manufactured in a facility fully qualified to MIL-PRF-
38534, this converter is available in four screening
grades to satisfy a wide range of requirements. The
CH grade is fully compliant to the requirements of
MIL-PRF-38534 for class H. The HB grade is
processed and screened to the class H requirement,
but may not necessarily meet all of the other MIL-
PRF-38534 requirements, e.g., element evaluation
and periodic inspection not required. Both grades
are tested to meet the complete group “A” test
specification over the full military temperature range
without output power deration. Two grades with more
limited screening are also available for use in less
demanding applications. For screening options, refer
to device screening table. Variations in electrical,
mechanical and screening can be accommodated.
Contact IR San Jose for special requirements.
(IR P/N 10207)
28V Input, 300V Single Output
ATW
Features
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18V to 40V
DC
Input Range (28V
DC
Nominal)
Short Circuit and Overload Protected
3
22.8W/in Power Density
30W Output Power
Adjustable Output Voltage
Fast Loop Response
Superior Transient Characteristics
Operating Temperature Range of
-55°C to +125°C
Popular Industry Standard Pin-Out
Resistance Seam Welded Case for Superior
Long Term Hermeticity
Shutdown from External Signal
Full Military Screening
MIL-PRF-38534 Compliant
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1
12/14/10
ATW28300S
(IR P/N 10207)
Specifications
Absolute Maximum Ratings
Input voltage
Soldering temperature, Lead
Operating case temperature
Storage case temperature
(-0.3V to +40V
DC
) Continuous, (-0.5V to +50V
DC
) Up to 1 second
300°C for 10 seconds
-55°C to +125°C
-65°C to +135°C
Electrical Performance Characteristics
Test
Symbol
Conditions
-55°C
≤Tc ≤+125°C
V
IN
= 28V
DC
±5%, C
L
= 0
R
ADJ
= 455 Ohms
Unless otherwise specified
V
IN
= 18, 28, and 40V
DC
I
OUT
= 5.0mA, R
ADJ
= 30 Ohms
V
IN
= 18, 28, and 40V
DC
I
OUT
= 5.0mA, R
ADJ
= 940 Ohms
I
OUT
= 100mA up to 1000 hrs
V
IN
= 18, 28, and 40V
DC
V
IN
= 18, 28, and 40V
DC
,
Iout = 50mA,
Iout = 100mA,
B.W. = DC to 1.0MHz
V
IN
= 18, 28, 40V
DC.
R
ADJ
= 940 Ohms
V
IN
= 18, 28, and 40V
DC
,
I
OUT
= 5.0, 50, and 100mA
V
IN
= 18, 28, and 40V
DC
,
I
OUT
= 5.0, 50, and 100mA
I
OUT
= 0, Enable (pin 2) tied to
Input Return
I
OUT
= 0, Enable (pin2) = open
I
OUT
= 100mA
I
OUT
= 100mA,
R
ADJ
= 940 Ohms
Input to output or any pin
to case (except pin 2) at 500V
DC
,
Tc = 25°C
No effect on DC performance
Overload
3
Group A
Subgroups
Min
130
305
Limits
Unit
Output voltage Min
Output voltage Max
10
10
V
OUT
Min
V
OUT
Max
I
OUT
V
RIP
1,2,3
1,2,3
1,2,3
1,2,3
1,2,3
1,2,3
1,2,3
1,2,3
1,2,3
1,2,3
1,2,3
1
2,3
1
4
1
1
1,2,3
4,5,6
4,5,6
4,5,6
4,5,6
Max
145
320
2.0
100
1000
V
DC
V
DC
%
mA
DC
mVp-p
W
Output voltage stability
8
Output current
7
Output ripple voltage
5.0
Output power
4, 8
P
OUT
VR
LINE
VR
LOAD
I
IN
I
RIP
E
FF
ISO
30
1.0
1000
18
80
50
80
78
100
10
14
250
-3.0
-10
9.0
300
+3.0
+10
2.0
5.0
Line regulation
Load regulation
Input current
Input ripple current
Efficiency
Isolation
6, 9
%
mV
mA
DC
mA
DC
mAp-p
%
MΩ
µF
W
W
KHz
Vpk
Vpk
ms
ms
Capacitive load
Power dissipation
load fault
C
L
P
D
F
S
VO
TLOAD
Switching frequency
Output response to step
5
transient load changes
Recovery time step
1, 5
transient load changes
Short circuit
I
OUT
= 100mA
50mA load to/from100mA load
5.0mA load to/from100mA load
50mA load to/from100mA load
5.0mA load to/from100mA load
TT
LOAD
For Notes to Specifications, refer to page 3
2
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ATW28300S
(IR P/N 10207)
Electrical Performance Characteristics - continued
Test
Symbol
Conditions
-55°C
≤Tc ≤+125°C
V
IN
= 28V
DC
±5%, C
L
= 0
R
ADJ
= 455 Ohms
Unless otherwise specified
Input step 18 to/from 40V
DC
Input step 18 to/from 40V
DC
Group A
Subgroups
Min
4,5,6
4,5,6
-10
Limits
Unit
Max
+10
2.0
Vpk
ms
Output response
transient step line
5, 9
changes
Recovery time
transient step line
1, 5, 9
changes
Turn on overshoot
Turn on delay
2
9
VO
TLINE
TT
LINE
VTon
OS
Ton
D
Tr
LF
Load fault recovery
Weight
I
OUT
= 0 and 100mA,
R
ADJ
= 940 Ohms
I
OUT
= 0 and 100mA,
R
ADJ
= 940 Ohms
V
IN
= 18 to 40V
DC,
R
ADJ
= 940 Ohms
Flange
4,5,6
4,5,6
4,5,6
20
350
350
75
Vpk
ms
ms
g
Notes to Specifications
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.
Turn-on delay time measurement is for either a step application of power at the input or the removal of ground signal from the
Enable pin (pin 2) while power is applied to the input.
3
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 a condition of maximum power dissipation.
4
Above +125°C case, derate output power linearly to 0 to +135°C case.
5 Transition time
>10µs.
6 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 may disturb loop stability and may interfere with the operation of the load fault detection circuitry, appearing
as an overload during turn-on.
7 Bandwidth guaranteed by design. Tested for 20KHz to 1.0MHz.
8 Parameter guaranteed by line and load regulation tests.
9
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 this table.
10 Output voltage can be adjusted to the range of 150V to 300V with an external 1KOhms trim pot. The trim pot shall be connected
to pin 5 (Output Adjust 1) and pin 6 (Output Adjust 2).
1
2
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3
ATW28300S
(IR P/N 10207)
Block Diagram
3
+Output
Input
1
Input
Filter
Enable
2
Drive 1
Drive 2
4
Output
Return
Pulse Width
Modulator
Feedback
Error Amp
& Reference
5
6
Output
Adjust 1
Output
Adjust 2
Input
10
Return
Mechanical Outline
1.000
0.040 D X
0.26 L Pins
0.05
10
1
2
9
4 X 0.400
=1.600
1.95
2.360
2.700
Max
3
7
8
4
6
5
0.500
Max
1.350
Max
Notes:
1) All dimensions are in inches
2) The tolerance for X.XXX = ±0.005
Pin Designation
Pin #
1
2
3
4
5
Designation
+Input
Enable
+ Output
Output Return
Output Adjust 1
Pin #
6
7
8
9
10
Designation
Output Adjust 2
Case
N/C
N/C
Input Return
4
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ATW28300S
(IR P/N 10207)
Device Screening
Requirement
Temperature Range
Element Evaluation
Non-Destructive
Bond Pull
Internal Visual
Temperature Cycle
Constant Acceleration
PIND
Burn-In
Final Electrical
( Group A )
PDA
Seal, Fine and Gross
Radiographic
External Visual
MIL-PRF-38534
2023
2017
1010
2001, Y1 Axis
2020
1015
MIL-PRF-38534
& Specification
MIL-PRF-38534
1014
2012
2009
N/A
Cond A
N/A
MIL-STD-883 Method
No Suffix
-20°C to +85°C
N/A
N/A
ES
d
HB
N/A
N/A
Yes
Cond C
3000 Gs
N/A
-55°C, +25°C,
+125°C
N/A
Cond A, C
N/A
Yes
CH
Class H
N/A
Yes
Cond C
3000 Gs
N/A
-55°C, +25°C,
+125°C
10%
Cond A, C
N/A
Yes
-55°C to +125°C
N/A
N/A
Yes
Cond B
500 Gs
N/A
48 hrs@hi temp
25°C
-55°C to +125°C -55°C to +125°C
c
N/A
N/A
N/A
N/A
25°C
d
160 hrs@125°C 160 hrs@125°C
N/A
Cond A, C
N/A
Yes
c
Notes:
Best commercial practice
Sample tests at low and high temperatures
Part Numbering
ATW 28 300 S /CH
Part Definition
Model
Input Voltage
Nominal
28 = 28V
Screening Level
(Please refer to Screening Table)
IR P/N 10207EM = ATW28300S/ES
IR P/N 10207FM = ATW28300S/HB
No Suffix, ES, HB, CH
Output
Output Voltage
300 = 300V
S = Single
WORLD HEADQUARTERS:
233 Kansas St., El Segundo, California 90245, Tel: (310) 252-7105
IR SAN JOSE:
2520Junction Avenue, San Jose, California 95134, Tel: (408) 434-5000
Visit us at www.irf.com for sales contact information.
Data and specifications subject to change without notice. 12/2010
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