IOR ATR28XXD User Manual

PD - 94550

A TR28XXD SERIES

ADVANCED ANALOG
HYBRID-HIGH RELIABILITY
DC/DC CONVERTERS

Description

The ATR28XXD 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-704D input requirements, these devices
have nominal 28VDC inputs with ±12V and ±15V dual
outputs to satisfy a wide range of requirements. The
circuit design incorporates a pulse width modulated
single forward topology operating in the feed-forward
mode at a nominal switching frequency of 550KHz.
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 feedback cir­cuits.

Three standard temperature grades are offered with
screening options. Ref er to P art Number section. The y
can be provided in a standard plug-in package for PC
mounting or in a flanged package for more severe en­vironments.

These converters are manufactured in a facility certi­fied to MIL-PRF-38534. All processes used to manu­facture these converters have been qualified to enable
Advanced Analog to deliver compliant devices.

28V Input, Dual Output

ATR

Features

n 16 to 40 VDC Input Range (28 VDC Nominal)

n

±12V and ±15V Outputs Available

n Indefinite Short Circuit and Overload
Protection

n 35 W/in
n 30 Watt Output Power
n Fast Loop Response for Superior Transient

Characteristics
n Operating Temperature Range from -55°C to
+125°C

n Popular Industry Standard Pin-Out
n Resistance Seam Welded Case for Superior

Long Term Hermeticity

n Ceramic Feed-thru Pins
n External Synchronization
n High Efficiency
n Shutdown from External Signal
n Military Screening

3

Power Density

Four screening grades are available to satisfy a wide
range of requirements. The CH grade converters are
fully compliant to MIL-PRF-38534 for class H. The HB
grade converters are processed to full class H screen­ing but do not have class H element evaluation as re­quired by MIL-PRF-38534. Both grades are fully tested
and operate over the full military temperature range
without derating of output power. The ES version is a
full temperature device without the full class H or ele­ment evaluation. The non-suffix device is a low cost

limited temperature range option. Variations in
electrical, mechanical and screening can be ac­commodated.

Extensive computer simulation using complex
modeling enables rapid design modification to
be provided. Contact Advanced Analog with spe­cific requirements.

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10/29/02

ATR28XXD Series

Specifications

T

= -55°C to +85°C, V

CASE

ABSOLUTE MAXIMUM RATINGS
Input Voltag e - 0 . 5 V to 50V D C
Power Output Interna lly limited, 36W ty p ical
Solde ring 300°C for 10 seconds
Temperature Range

1

R e c o mme n ded Operating -55°C to +8 5 °C
Maximum Operating -5 5°C to +11 5 °C
S to r a ge -6 5°C to +135°C

PARAMETER

STATIC CHARACTERISTICS
OUTPUT VIN = 16 to 40 VDC
Voltage I
Current 5 0.0
Ripple Full Load, 20KHz to 2MHz 40 85 40 85 mV p-p
Accuracy
Power1 30 30 W
REGULATION
Line
Load
CROSS REGULATION6 V
INPUT
Voltage Range
Current

Ripple Current
EFFICIENCY
ISOLATION Input to output @500 VDC 100 100
CAPACITIVE LOAD No effect on performance

Load Fault Power Dissipation Short Circuit

Switching Frequency I
SYNC Frequency Range7 500 700 500 700 KHz
DYNAMIC CHARACTERISTICS
Step Load Changes
Output
Transient

Recovery 2

Step Line Changes
Output
Transient
Recovery 2

TURN-ON

Overshoot
Delay3
Load Fault Recovery VIN = 16 to 40 VDC 14 25 14 25 ms

Notes to Specifications

1. Above +85°C case temperature, derate output power linearly to 0 at +115°C case.

2. Recovery time is measured from the initiation of the input transient to where V

3. Turn-on delay time measurement is for either an application of power at the input or a signal at the inhibit pin.

4. Load current split equally between +V

5. Up to 90% of Full Power is available from either output provided. The total power output does not exceed 30 watts.

6. 3W load on output under test, 3W to 27W on other output.

7. Sync. Input signal: V

0.8V Max 11.5V Max

= -0.5V Min, V

IL

= +28V ± 5% unless otherwise specified

IN

-55°C ≤ TC ≤ +85°C, V

OUT

T

CASE

VIN = 16 to 40 VDC
I

OUT

IN

No Load, pin 2 = open
Inhibited, pin 2 tied to pin 10
Full Load
Full Load TC = +25°C

TC = +25°C (total for both outputs)
Overload, TC = +25°C

OUT

50% Load to 100% Load
No Load to 50% Load

50% Load to 100% Load
No Load to 50% Load
50% Load to No Load

Input step 16 to 40 VDC
Input step 40 to 16 VDC
Input step 16 to 40 VDC
Input step 40 to 16 VDC

VIN = 16 to 40 VDC
I

OUT

Condition

±

5%, CL=0, unless otherwise

specified

= 0 to Full Load

= 25°C, Full Load

= 0 to Full Load

= 16, 28, and 40 VDC

= Full Load 500 600 500 600 KHz

= O and Full Load

and –V

OUT

= 2.5V Min, 10% to 90% duty cycle,

IN

OUT

= 28 V

IN

.

DC

Min Typ Max Min Typ Max Units

±

11.76 ±12.00 ±12.24 ±14.70 ±15.00 ±15.30

±

11.88 ±12.00 ±12.12 ±14.85 ±15.00 ±15.15

16.0 28.0

82 82 %

100 100
9

ATR2812D

±

1.25

75

120

±

5

40.0
75

25

±

100

±

250
25

500

3

±

180

-600
5
5

0

14

18
50

14

600

25

has returned to within ±1% of V

OUT

0.0

16.0 28.0

9

ATR2815D

25

±

100

±

250
25

500

3

±

180

-600
5
5

0

14

VDC
ADC

VDC

mV
mV

%

5

mVpk

VDC
mADC
mADC

mA p-p

MΩ

µ

F

W
W

mVpk

µ

s

µ

s

ms

mVpk
mVpk

ms

ms

mVpk

ms

at 50% load.

OUT

±

1.0

75

150

±

40.0
75
18
50

14

600

25

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ATR28XXD Series

Specifications

T

= -55°C to +125°C, V

CASE

ABSOLUTE MAXIMUM RATINGS
Input Voltage -0.5V to 50VDC
Power Output Internally limited, 36W typical
Soldering 300°C for 10 seconds
Temperature Range

1

Recommend ed O pe rating -55°C to +125°C
Maximum Operating -55°C to +135°C
Storage -65°C to +13 5°C

STATIC CHARACTERISTICS
OUTPUT VIN = 16 to 40 VDC
Voltage I
Current 5 0.0
Ripple Full Load, 20KHz to 2MHz 40 85 40 85 mV p-p
Accuracy
Power1 30 30 W
REGULATION
Line
Load
CROSS REGULATION6 V
INPUT
Voltage Range
Current

Ripple Current
EFFICIENCY
ISOLATION Input to output @500 VDC 100 100
CAPACITIVE LOAD No effect on perfor m ance

Load Fault Power Dissip at ion Short Circuit
Switching Frequency I

SYNC Frequency Range7 500 700 500 700 KHz
DYNAMIC CHARACTERISTICS
Step Load Changes
Output
Transient

Recovery

Step Line Changes
Output
Transient
Recovery

TURN-ON

Overshoot
Delay3
Load Fault Recovery VIN = 16 to 40 VDC 14 25 14 25 ms

Notes to Specifications

PARAMETER

2

2

1. Above +125°C case temperature, derate output power linearly to 0 at +135°C case.

2. Recovery time is measured from the initiation of the input transient to where V

3. Turn-on delay time measurement is for either an application of power at the input or a signal at the inhibit pin.

4. Load current split equally between +V

5. Up to 90% of Full Power is available from either output provided. The total power output does not exceed 30 watts.

6. 3W load on output under test, 3W to 27W on other output.

7. Sync. Input signal: V

0.8V Max, 11.5V Max

= -0.5V Min, V

IL

= +28V ± 5% unless otherwise specified

IN

Condition

-55°C ≤ TC ≤ +125°C, V

V

±5%, CL=0, unless otherwise

DC

specified

= 0 to Full Load

OUT

T

= 25°C, Full Load

CASE

= 16 to 40 VDC

V

IN

I

= 0 to Full Load

OUT

= 16, 28, and 40 VDC

IN

No Load, pin 2 = open
Inhibited, pin 2 tied to pin 10
Full Load
Full Load T

T

C

outputs)
Overload, T

OUT

50% Load to
No Load to 50% Load

50% Load to 100% Load
No Load to 50% Load
50% Load to No Load

Input step 16 to 40
Input step 40 to 16 V
Input step 16 to 40 VDC
Input step 40 to 16 VDC

V

IN

I

OUT

= +25°C

C

= +25°C (total for both

= +25°C

C

= Full Load 500 600 500 600 KHz

100% Load

= 16 to 40 VDC

= O to Full Load

and –V

OUT

= 2.5V Min, 10% to 90% duty cycle

IN

VDC

OUT

= 28

IN

Min Typ Max Min Typ Max Units

±

11.76 ±12.00 ±12.24 ±14.70 ±15.00 ±15.30

±

11.88 ±12.00 ±12.12 ±14.85 ±15.00 ±15.15

16.0 28.0

80 82 79 82 %

100 100

9

DC

.

ATR2812D/ES

25

±

100

±

250
25

500

3

±

180

-600
5
5

0

14

OUT

75

±

75
18
50

14

5

0.0

16.0 28.0

9

±

1.25

120

40.0

600

25

has returned to within ±1% of V

ATR2815D/ES

25

±

100

±

250
25

500

3

±

180

-600
5
5

0

14

±

1.0

75
150

±

5

40.0
75
18
50

14

mVpk

600

25

at 50% load.

OUT

VDC
A

DC

V

DC

mV
mV

%

V

DC

mA

DC

mA

DC

mA p-p

MΩ

µ

F

W
W

mVpk

µ

s

µ

s

ms

mVpk
mVpk

ms
ms

mVpk

ms

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