PD-94551D
ATR28XXT SERIES
HYBRID-HIGH RELIABILITY
DC/DC CONVERTER
Description
The ATR28XXT Series of DC/DC converters provide
30W of output power over the full military temperature
range with no derating. These devices are pin
compatible with the ATO series converters but offer
twice the maximum output power in a lower profile
package. A custom CMOS ASIC pulse width modulator
operating at a nominal switching frequency of 550KHz
combined with a unique magnetic feedback reduces
circuit complexity for enhanced reliability. These
converters provide 500V input to output isolation and
operate in highly efficient single forward mode.
The advanced feedback design and high operating
frequency provide an extremely wide bandwidth control
loop with high gain and phase margin. This results in
fast dynamic line and load response as well as superior
audio rejection. The control loop is compensated to
provide optimum performance over the full military
temperature range and over the 16V to 40V input voltage
range.
These converters are protected against both continuous
output short circuits and output overload. Either load
fault condition will result in operating in a low power
dissipation foldback mode. The converters will shut
down for approximately 15ms, then attempt to restart.
This cycle will continue indefinitely unless the load fault
is corrected. Recovery to normal operation is automatic
upon removal of the load fault.
Manufactured in a facility full 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 limited
accomodated. Contact IR Santa Clara with specific
requirements.
28V Input, Triple Output
ATR
Features
n
n
n
n
n
n
n
n
n
n
30W Output Power
Flexible Output Loading
-55°C to +125°C Operation
Pin Compatible with ATO
0.410” Maximum Height
16V to 40VDC Input Range
500V Input to Output Isolation
High Audio Rejection
MIL-STD-704 Compatible
Load Fault Protection - Short Circuit and
Overload
n
TTL level Compatible Synchronization
n
Standard Microcircuit Drawings Available
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1
08/06/07
ATR28XXT Series
Specifications
T
CASE
= -55°C to +125°C, V
IN
= +28V
±
5% unless otherwise specified
Absolute Maximum Ratings
Input voltage
Power Output
Lead temperature
Storage temperature
Test
STATIC CHARACTERISTICS
OUTPUT
Voltage
1
Symbol
-0.5V to +50VDC
Internally limited, 37.5W typical
300°C
-65°C to +135°C
Conditions
-55°C
≤
TC
≤
+125°C,
V
IN
= 28 V
DC
±5%,
C
L
=0,
unless otherwise specified
ATR2812T
Min
Max
ATR2815T
Min
Max
Units
V
OUT
Current
1,2,3,4
I
OUT
Ripple
1,5
V
RIP
I
OUT
= 0 (main) +25°C
over temp. range
I
OUT
= 0 (dual)
1
+25°C
over temp. range
V
IN
= 16, 28, and 40VDC
(main)
V
IN
= 16, 28, and 40VDC
(dual)
1
V
IN
= 16, 28, and 40VDC
(dual)
BW = 20Hz to 2MHz (main)
V
IN
= 16, 28, and 40 VDC
BW = 20Hz to 2 MHz (dual)
V
IN
= 16, 28, and 40 VDC
P
OUT
= 0.5, 7.5, 15W (main)
V
IN
= 16, 28, and 40VDC
(dual)
P
OUT
= 1.2/1.5, 7.5 and 15W
(dual)
V
IN
= 16, 28, and 40 VDC
P
OUT
= 0.5, 7.5, 15W (main)
V
IN
= 16, 28, and 40 VDC
P
OUT
= 1.2/1.5, 7.5, and 15W
(dual)
I
OUT
= 0, inhibit (pin 8)
Tied to input return (pin 10)
I
OUT
= 0, inhibit (pin 8) =
open
I
OUT
= 3000mA (main)
P
OUT
= 15W (dual)
BW = 20Hz to 2MHz
I
OUT
= 3000mA (main) +25°C
P
OUT
= 15W (dual)
over temp. range
Input to output or any pin to
case
4.95
4.90
±11.88
±11.76
100
0.0
5.05
5.10
±12.12
±12.24
4000
±625
60
40
4.95
4.90
±14.85
±14.70
100
0.0
5.05
5.10
±15.15
±15.30
4000
±500
60
40
V
DC
V
DC
V
DC
V
DC
mA
mA
mVp-p
mVp-p
REGULATION
Line
1,3
VR
LINE
±25
±60
±50
±60
±25
±75
±50
±75
Load
1,3
mV
VR
LOAD
INPUT
Current
Ripple Current
4
I
IN
I
RIP
15
75
50
75
72
100
14
9.0
600
700
13
+500
+1000
200
5.0
10
75
72
100
15
75
50
mA
mA
mAp-p
%
MΩ
EFFICIENCY
ISOLATION
E
FF
ISO
Load Fault Power Dissipation
3
Switching Frequency
SYNC Frequency Range
Inhibit Open Circuit Voltage
Output Response to
Step transient
Load changes
7
Recovery Time Step
Step transient
Load changes
7,8
P
D
F
S
F
SYNC
V
OI
VO
TLOAD
TT
LOAD
(except pin 8)at 500
TC=+25°C
Overload
Short circuit
50% load to/from 100% load
no load to/from 50% load
50% load to/from 100% load
No load to/from 50% load
50% load to/from 100% load
No load to 50% load
50% load to no load
500
500
9.0
-500
-1000
500
500
9.0
-500
-1000
14
9.0
600
700
13
+500
+1000
200
5.0
10
W
KHz
KHz
V
mVpk
µs
ms
ms
For Notes to Specifications, refer to page 3
2
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ATR28XXT Series
Specifications
T
CASE
= -55°C to +125°C, V
IN
= +28V
±
5% unless otherwise specified
Absolute Maximum Ratings
Input voltage
Power Output
Soldering temperature
Temperature Range
6
-0.5V to +50VDC
Internally limited, 37.5W typical
300°C for 10 seconds
Operating case temperature
Storage case temperature
Conditions
-55°C
≤
TC
≤
+125°C,
V
IN
= 28 V
DC
±5%,
C
L
=0,
unless otherwise specified
ATR2812T
Min
Max
-55°C to +135°C
-65°C to +135°C
ATR2815T
Min
Max
Units
Test
Symbol
Output Response to
Transient step
9
Line changes
10
Recovery Time
8
Transient step
9
Line changes
10
Turn on Overshoot
1
Turn on Delay
1, 11
10
VO
TLINE
TT
LINE
VTon
OS
Ton
D
TR
LF
Input step 16 from/to 40 VDC
I
OUT
= 3000mA (main)
P
OUT
= 15W (dual)
Input step 16 from/to 40 VDC
I
OUT
= 3000mA (main)
P
OUT
= 15W (dual)
I
OUT
= 0, and 3000mA (main)
P
OUT
= 0, 15W (dual)
I
OUT
= 0, 3000mA (main)
P
OUT
= 0, 15W (dual)
±1500
±1500
mV pk
10
1000
25
25
65
10
1000
25
25
65
ms
mV pk
ms
ms
g
Load Fault Recovery
Device weight
Notes to Specifications
Tested at each output.
Parameter guaranteed byline and load regulation tests.
Although operation with no load is permissible, light loading on the main (+5V) output may cause the output voltage of the auxiliary
outputs (±12V or
±15V)
to drop out of regulation. It is therefore recommended that at least 100mA or 20% of the output power,
whichever is greater, be taken from the main (+5V) output and at least 50mA (or
±12V:
1.2W,
±15V:
1.5W) of the output power is
taken from the auxiliary (±12V or
±15V)
.
4. Total combined output power –30W.
5. Bandwidth guaranteed by design. Tested for 20KHz to 2MHz.
6. An overload is that condition with a load in excess of the rated load but less than that necessary to trigger the overload protection
circuit and is the condition of maximum power dissipation.
7. Load step transition time between 2.0µs and 10µs.
8. 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.
9. Input step transition time between 2.0µs to 10µs.
10. 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 the table.
11. 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 8) while power is applied to the input.
1.
2.
3.
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3
ATR28XXT Series
Block Diagram
5 +Vout
+Input
1
EMI
Filter
Tracking
Regulator
Enable Input
8
Case
7
Sync Input
9
Primary
Housekeeping
Supply
4 -Vout
2
+5Vdc
Output
Drive
Pulse Width
FB
Modulator
CS
Error
Amp &
Ref
3 Output
Return
Input Return
10
Standard Microcircuit Drawing Equivalence Table
Standard Microcircuit
Drawing Number
5962-92159
5962-93158
Vendor Cage
Code
52467
52467
IR Standard
Part Number
ATR2815T
ATR2812T
4
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ATR28XXT Series
Mechanical Outlines
1.000
0.040 D X
0.26 L Pins
0.05
10
1
9
2
4 X 0.400
=1.600
1.95
2.360
2.700
Max
3
8
4
6
7
5
0.410
Max
1.350
Max
Pin Designation
Pin #
1
2
3
4
5
6
7
8
9
10
Designation
+ Input
+5Vdc Output
Output Return
- Dual Output
+ Dual Output
NC
Case Ground
Enable Input
Sync Input
Input Return
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