PD-94556A
ATW28XXS SERIES
28V Input, Single Output
HYBRID-HIGH RELIABILITY
DC/DC CONVERTER
Description
ATW
The ATW28XXS Series of DC/DC converters feature
high power density and an extended temperature range
for use in military and industrial applications. Designed Features
to MIL-STD-704 input requirements, these devices
19V to 40VDC Input Range (28VDC Nominal)
operate with a nominal 28VDC input and are available
30W Output Power
with single outputs at 5V,12V and 15V. The circuit design
Indefinite Short Circuit and Overload Protection
incorporates a pulse width modulated push-pull
3
22.8W/in Power Density
topology operating in the feed-forward mode at a
Fast Loop Response for Superior Transient
nominal switching frequency of 270KHz. Input to output
isolation is achieved through the use of transformers in Characteristics
Operating Temperature Range from -55C to
the forward and feedback circuits.
+125C Available
The advanced feedback design provides fast loop
Popular Industry Standard Pin-Out
response for superior line and load transient
Resistance Seam Welded Case for Superior
characteristics and offers greater reliability and radiation
Long Term Hermeticity
tolerance than devices incorporating optical elements
Efficiencies up to 83%
in the feedback circuits.
Shutdown from External Signal
Military Screening
Three standard temperature grades are offered. Refer
250,000 hour MTBF at 85C
to Part Number section. These devices are provided in
Standard Microcircuit Drawings Available
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.
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ATW28XXS Series
Specifications ATW2805S
Absolute Maximum Ratings
Input voltage -0.5V to +50VDC
Soldering temperature 300C for 10 seconds
Operating case temperature -55C to +125C
Storage case temperature -65C to +135C
Table I. Electrical Performance Characteristics
Group A Device
Test Symbol Conditions Limits Unit
Subgroups Types
-55C Tc +125C
Vin = 28 Vdc 5%, CL = 0
Unless otherwise specified
Min Max
Output voltage V I = 0 1 All 4.95 5.05 V
OUT OUT
2,3 4.90 5.10
1
I V = 19, 28, and 40 V dc 1,2,3 All 0 6000 mA
Output current OUT IN
2
Output ripple voltage VRIP VIN = 19, 28, and 40 V dc, 1,2,3 All 50 mVp-p
B.W. = dc to 2MHz
1, 3
P V = 19,28, and 40 V dc 1,2,3 All 30 W
Output power OUT IN
4
VR V = 19, 28, and 40 V dc, 1 All 5.0 mV
Line regulation LINE IN
Iout = 0, 3000, and 6000mA
2,3 20
4
VR V = 19, 28, and 40 V dc, 1,2,3 All 30 mV
Load regulation LOAD IN
I = 0, 3000, and 6000mA
OUT
Input current IIN IOUT = 0, inhibit (pin 2) 1,2,3 All 18 mA
tied to input return (pin 10)
IOUT = 0, inhibit (pin 2) = open 40
2
I I = 6000mA 1,2,3 All 20 mAp-p
Input ripple current RIP OUT
B.W. = dc to 2MHz
Efficiency EFF IOUT = 6000mA 1 All 78 %
T = +25 C
C
Isolation ISO Input to output or any pin 1 All 100 M
to case (except pin 7) at 500
V dc Tc = +25C
5, 6
CL No effect on dc performance, 4 All 500 F
Capacitive load
Tc = +25C
7
Power dissipation P 1 All 12 W
D Overload, T = +25 C
C
load fault
9.0
Short circuit, T = +25 C
C
Switching frequency F I = 6000mA 4,5,6 01 250 300 KHz
S OUT
02 250 270
03 275 300
pk
Output response to step VOTLOAD 4000mA to/from 6000mA 4,5,6 All -500 +500 mV
8
transient load changes
500mA to/from 2500mA 4,5,6 -500 +500
For Notes to Specifications, refer to page 3
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