LAMBDA ADVANCED ANALOG INC.
λ
ATR2800T Series
Hybrid - High Reliability
High Power Triple Output DC/DC Converters
DESCRIPTION
The ATR2800T Series of DC/DC converters provide
30 watts of output power over the full military
temperature range with no derating. These devices
are pin compatible with the Lambda Advanced
Analog 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
circuit reduces circuit complexity for enhanced
reliability. These converters provide 500 volt 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 16
to 40 volt 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 15
milliseconds, 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 fully qualified to MIL-PRF-
38534, these converters are 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 Inspections (PI) 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. Variations in electrical, mechanical
and screening can be accommodated. Contact
Lambda
Advanced
Analog
with
specific
requirements.
FEATURES
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30 Watt Output Power
Flexible Output Loading
-55 to +125°C Operation
Pin Compatible With ATO
0.410” Maximum Height
16 to 40 Volt Input Range
500 Volt Input to Output Isolation
High Audio Rejection
MIL-STD-704 Compatible
Load Fault Protection – Short Circuit and
Overload
TTL Level Compatible Synchronization
SPECIFICATIONS
T
CASE
= -55°C to +125°C, V
IN
= +28 V ±5% unless otherwise specified
ABSOLUTE MAXIMUM RATINGS
1
Input Voltage Range
Power Dissipation
Lead Temperature
Storage Temperature
-0.5 V
DC
to +50 V
DC
14W
+300°C
-65°C to 150°C case
Conditions
-55°C - Tc - +125°C, V
IN
= 28 V
DC
Test
Symbol
±5%, C
L
=0, unless otherwise specified
ATR2812T
Limits
Min
Max
ATR2815T
Limits
Min
Max
Units
STATIC CHARACTERISTICS
OUTPUT
Voltage
1
V
OUT
I
OUT
= 0 (main) +25°C over temperature range
I
OUT
= 0 (dual)
1
+25°C over temperature range
Current
1,2,3,4
Ripple Voltage
1,5
I
OUT
V
RIP
V
IN
= 16, 28, and 40 V
DC
(main)
V
IN
= 16, 28, and 40 V
DC
(dual)
1
V
IN
= 16, 28, and 40 V
DC
(dual)
BW = 20 H
Z
to 2 MHz (main)
V
IN
= 16, 28, and 40 V
DC
BW = 20 H
Z
to 2 MHz (dual)
V
IN
= 16, 28, and 40 V
DC
P
OUT
= .5, 10, 20 W (main)
V
IN
= 16, 28, and 40 V
DC
(dual)
P
OUT
= 0, 5, 10 watts (dual)
12
V
IN
= 16, 28, and 40 V
DC
P
OUT
= .5, 10, 20 W (main)
V
IN
= 16, 28, and 40 V
DC
P
OUT
= 0, 5, 10 watts (dual)
12
I
OUT
= 0, inhibit (pin 8)
tied to input return (pin 10)
I
OUT
= 0, inhibit (pin 8) = open
I
OUT
= 4000 mA (main)
P
OUT
= 10 W (dual)
12
BW = 20 H
Z
to 2 MHz
I
OUT
= 4000 mA (main) +25°C over temperature range
P
OUT
= 10 W (dual)
12
input to output or any pin to case (except pin 8) at 500
T
C
= +25°C
Overload
Short circuit
4.95
5.05
4.90
5.10
±11.88 ±12.12
±11.76 ±12.24
100.0 4000
0.0 ±625
60
40
4.95
5.05
4.90
5.10
±14.85 ±15.15
±14.70 ±15.30
100.0 4000
0.0 ±500
60
40
V
DC
V
DC
V
DC
V
DC
mA
mA
mV p-p
mV p-p
REGULATION
Line
1,3
VR
LINE
±25
±60
±50
±60
15
75
50
75
72
100
14
9
500
600
700
13
500
500
9
75
72
100
±25
±75
±50
±75
15
75
50
mV
mV
mV
mV
mA
mA
mA p-p
%
Load
1,3
VR
LOAD
INPUT
Current
Ripple Current
4
EFFICIENCY
ISOLATION
I
IN
I
RIP
E
FF
I
SO
M Ohms
14
9
600
700
13
W
W
KHz
KHz
V
LOAD FAULT POWER
DISSIPATION
3
SWITCHING FREQUENCY
P
D
F
S
SYNC FREQ. RANGE
F
SYNC
INHIBIT OPEN CIRCUIT
VOLTAGE
OUTPUT RESPONSE TO
Step transient
load changes
7
RECOVERY TIME STEP
Step transient
load changes
7,8
V
OI
50% load to/from 100% load
no load to/from 50% load
500
9
VO
TLOAD
50% load to/from 100% load
no load to/from 50% load
TT
LOAD
50 percent load to/from
100 percent load
No load to 50 percent load
50 percent load to no load
-500
-1000
+500
+1000
-500
-1000
+500
+1000
mV pk
200
5
10
200
5
10
µs
ms
ms
2
SPECIFICATIONS
T
CASE
= -55°C to +125°C, V
IN
= +28 V ±5% unless otherwise specified
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Power Output
Soldering
Temperature Range
6
-0.5 V to +50 V
Internally limited, 17.5W typical
300°C for 10 seconds
Operating
-55°C to 135°C case
Storage -65°C to +135°C
Conditions
-55°C - Tc - +125°C, V
IN
= 28 V
DC
Test
Symbol
±5%, C
L
=0, unless otherwise specified
ATR2812T
Limits
Min
Max
ATR2815T
Limits
Min
Max
Units
STATIC CHARACTERISTICS
OUTPUT RESPONSE TO
Transient step
9
VO
TLINE
Input step 16 from/to 40V
DC
Line changes
10
I
OUT
= 4000 mA (main)
P
OUT
= 10 W (dual)
RECOVERY TIME
8
Transient step
9
Line changes
10
TURN ON OVERSHOOT
1
TURN ON DELAY
1,11
±1500
±1500
mV pk
TT
LINE
Input step 16 form/to 40V
DC
I
OUT
= 4000 mA (main)
P
OUT
= 10 W (dual)
10
1000
25
25
10
1000
25
25
ms
mV pk
ms
ms
VTON
OS
I
OUT
= 0 and 4000 mA (main)
P
OUT
= 0, 10 W (dual)
TON
D
LOAD FAULT RECOVERY
10
I
OUT
= 0 and 4000 mA (main)
P
OUT
= 0, 10 W (dual)
TR
LF
Notes:
1. Tested at each output.
2. Parameter guaranteed by line and load regulation tests.
3. Although operation with no load is permissible, light loading on the main (+5 volt) output may cause the output voltage of the auxiliary outputs
(±12 volt or ±15 volt) to drop out of regulation. It is therefore recommended that at least 100 mA or 20 percent of the output power, whichever is
greater, be taken from the main (+5 volt) output.
4. Total combined output power - 30 watts.
5. Bandwidth guaranteed by design. Tested for 20 KHz to 2 MHz.
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 and 10 microseconds.
8. Recovery time is measured from the initiation of the transient to where V
OUT
has returned to within ±1 percent of V
OUT
at 50 percent load.
9. Input step transition time between 2 and 10 microseconds.
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.
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