Analog Devices ADDC02803SC, ADDC02805SA Datasheet

+V

OUT

RETURN

+ SENSE

ADJUST
STATUS

V

AUX

INHIBIT

SYNC

I

SHARE

TEMP

–V

IN

+V

IN

FIXED

FREQUENCY

DUAL
INTERLEAVED
POWER TRAIN

– SENSE

RETURN

RETURN

+V

OUT

+V

OUT

OUTPUT

FILTER

OUTPUT SIDE

CONTROL

CIRCUIT

INPUT SIDE

CONTROL

CIRCUIT

EMI FILTER

ADDC02803SC

ADDC02805SA

28 V/66 W/100 W DC/DC Converters

a

FEATURES
28 V dc Input, 5 V dc @ 20 A, 100 W Output

(ADDC02805SA)

28 V dc Input, 3.3 V dc @ 20 A, 66 W Output

(ADDC02803SC)
Integral EMI Filter Designed to Meet MIL-STD-461D
Low Weight: 80 Grams
NAVMAT Derated
Many Protection and System Features

APPLICATIONS
Commercial and Military Airborne Electronics
Missile Electronics
Space-Based Antennae and Vehicles
Mobile/Portable Ground Equipment
Distributed Power Architecture for Active Array Radar

GENERAL DESCRIPTION

The ADDC02803SC and ADDC02805SA hybrid dc/dc con­verters with integral EMI filters offer the highest power density
of any dc/dc converter with their features and in their power
range available today. The converters with integral EMI filters
are fixed frequency, 1 MHz square wave switching dc/dc power
supplies. They are not variable frequency resonant converters.
In addition to many protection features, these converters have
system level features that allow them to be used as components
in larger systems as well as stand-alone power supplies. The
units are designed for high reliability and high performance
applications where saving space and/or weight are critical.

The ADDC02803SC and ADDC02805SA are available in
three screening grades; all grades use a hermetically sealed,
molybdenum based hybrid package. Three screening levels
are available, including military SMD.

with Integral EMI Filter

ADDC02803SC/ADDC02805SA

FUNCTIONAL BLOCK DIAGRAM

PRODUCT HIGHLIGHTS

1. Up to 60 W/cubic inch power density with an integral EMI
filter designed to meet all applicable requirements in MIL­STD-461D when installed in a typical system setup.

2. Light weight: 80 grams

3. Operational and survivable over a wide range of input condi­tions: 16 V–50 V dc; survives low line, high line and positive
and negative transients. See section entitled: Input Voltage
Range.

4. High reliability; NAVMAT derated

5. Protection features include:
Output Overvoltage Protection
Output Short Circuit Current Protection
Thermal Monitor/Shutdown
Input Overvoltage Shutdown
Input Transient Protection

6. System level features include:
Current Sharing for Parallel Operation
Inhibit Control

Output Status Signal
Synchronization for Multiple Units
Input Referenced Auxiliary Voltage Supply

REV. A

Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone] World Wide Web Site: http://www.analog.com
Fax: [phone] © Analog Devices, Inc., 1998

ADDC02803SC/ADDC02805SA–SPECIFICATIONS

ELECTRICAL CHARACTERISTICS

(TC = +25ⴗC, VIN = 28 V dc ⴞ 0.5 V dc, unless otherwise noted; full temperature range is

–55ⴗC to +90ⴗC; all temperatures are case and TC is the temperature measured at the center of the package bottom.)

Parameter Temp Level Conditions Min Typ Max Min Typ Max Units

INPUT CHARACTERISTICS

Steady State Operating Input Voltage Range
Abnormal Operating Input Voltage Range

(Per MIL-STD-704D)

1

Input Overvoltage Shutdown +25°C I 50 52.5 55 50 52.5 55 V
No Load Input Current +25°C I 90 90 mA
Disabled Input Current Full VI 0.85 2.0 0.85 2.0 mA

OUTPUT CHARACTERISTICS

Output Voltage (V

) +25°CI I

O

2, 3

Line Regulation +25°CV I
Load Regulation +25°CV V
Output Ripple/Noise
Output Current (I

4

) Full VI VIN = 18 V to 40 V dc 2 21.2 2 20 A

O

Output Overvoltage Protection +25°CV I
Output Current Limit +25°CV V
Output Short Circuit Current +25°C I 39 35 A

ISOLATION CHARACTERISTICS

Isolation Resistance +25°C I Input to Output or Any Pin to Case at 500 V dc 100 100 MΩ

DYNAMIC CHARACTERISTICS

4

Output Voltage Deviation Due to

Step Change in Load +25°CV I

Response Time Due to Step Change in Load +25°CV I

Soft Start Turn-On Time

5

THERMAL CHARACTERISTICS

Efficiency +25°CI I

Hottest Junction Temperature

6

CONTROL CHARACTERISTICS

Clock Frequency Full VI I
ADJUST (Pin 3) V ADJ +25°C I 1.26 1.32 1.38 1.92 2.04 2.10 V
STATUS (Pin 4)

V

OH

V

OL

(Pin 5)

V

AUX

(nom) +25°CI I

V

O

INHIBIT (Pin 6)

V

IL

I

IL

(Open Circuit) +25°C I 15 15 V

V

I

SYNC (Pin 7)

V

IH

I

IH

I

SHARE

7

(Pin 8) +25°CI I

TEMP (Pin 9) +25°C V 3.90 3.90 V

NOTES

1

50 V dc upper limit rated for transient condition of up to 50 ms. 16 V dc lower limit rated for continuous operation during emergency condition. Steady state and
abnormal input voltage range require source impedance sufficient to insure input stability at low line. See sections entitled System Instability Considerations and Input
Voltage Range.

2

Measured at the remote sense points.

3

Unit regulates output voltage to zero load.

4

C

= 0.

LOAD

5

Output is fully loaded into a constant resistive load.

6

Refer to section entitled Thermal Characteristics for more information.

7

Unit has internal pull-down; refer to section entitled Pin 7 (SYNC).

Specifications subject to change without notice.

Case Test ADDC02803SC ADDC02805SA

1

Full VI IO = 2 A to 20 A 18 28 40 18 28 40 V

Full VI IO = 2 A to 16 A 16 50 16 50 V

= 2 A to 20 A, VIN = 18 V to 40 V dc 3.26 3.30 3.34 5.00 5.025 5.05 V

O

Full VI I
Full VI I

+25°CI I

+25°CI I

Max VI I
Min VI I
+25°CI I
Max VI I
Min VI I

= 2 A to 20 A, VIN = 18 V to 40 V dc 3.2 3.4 4.925 5.125 V

O

= 2 A to 16 A, VIN = 16 V to 50 V dc 3.2 3.4 4.925 5.125 V

O

= 20 A, VIN = 18 V to 40 V dc 1 1 mV

O

= 28 V dc, IO = 2 A to 20 A 1 1 mV

IN

= 20 A, 5 kHz – 2 MHz BW 15 35 15 50 mV p-p

O

= 20 A, Open Remote Sense Connection 145 125 % VO Nom

O

= 90% V

O

= 10 A to 20 A or 20 A to 10 A di/dt = 0.5 A/µs 350 500 mV

O

= 10 A to 20 A or 20 A to 10 A, di/dt = 0.5 A/µs, 135 125 µs

O

Time for V

= 20 A, From Inhibit High to Status High 1 4 7 20 ms

O

= 12 A 75 79 77 80 %

O

= 12 A 75 77 %

O

= 12 A 72 75 %

O

= 20 A 74 77 77 79 %

O

= 20 A 74 77 %

O

= 20 A 73 75 %

O

Nom 130 % IO max

OUT

to Return within 2% of Final Value

OUT

+90°CV IO = 20 A 110 110 °C

= 2 A 0.85 0.99 0.85 0.99 MHz

O

+25°CI IOH = 400 µA 2.4 4.0 2.4 4.0 V
+25°CI I

= 1 mA 0.15 0.7 0.15 0.7 V

OL

= 5 mA, Load Current = 20 A 13.2 13.7 14.2 14.3 14.7 15.3 V

AUX

+25°C I 0.5 0.5 V
+25°CI V

= 0.5 V 1.2 1.2 mA

IL

+25°C I 4.0 4.0 V
+25°CI VIH = 7.0 V 175 175 µA

= 20 A 2.62 2.72 2.82 2.75 2.82 2.95 V

O

–2–

REV. A

ADDC02803SC/ADDC02805SA

WARNING!

ESD SENSITIVE DEVICE

ABSOLUTE MAXIMUM RATINGS*

INHIBIT . . . . . . . . . . . . . . . . . . . . . . . . . . 50 V dc, –0.5 V dc

SYNC . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.0 V dc, –0.5 V dc

I

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 V dc, –0.5 V dc

SHARE

TEMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 V dc, –0.3 V dc

Common-Mode Voltage, Input to Output . . . . . . . . . 500 V dc

Lead Soldering Temp (10 sec) . . . . . . . . . . . . . . . . . . . +300°C

Storage Temperature . . . . . . . . . . . . . . . . . . –65°C to +150°C

Maximum Junction Temperature . . . . . . . . . . . . . . . . +150°C

Maximum Case Operating Temperature . . . . . . . . . . . +125°C

*Absolute maximum ratings are limiting values, to be applied individually, and

beyond which the serviceability of the circuit may be impaired. Functional
operability under any of these conditions is not necessarily implied. Exposure of
absolute maximum rating conditions for extended periods of time may affect
device reliability.

ORDERING INFORMATION

Operating
Temperature

Device Range (Case) Description

ADDC02803SCKV –40°C to +85°C Hermetic Package
ADDC02803SCTV –55°C to +90°C Hermetic Package

5962-9760101HXC

(ADDC2803SCTV/QMLH) –55°C to +125°C Hermetic Package
ADDC02805SAKV –40°C to +85°C Hermetic Package

ADDC02805SATV –55°C to +90°C Hermetic Package

5962-9570701HXC

(ADDC2805SATV/QMLH) –55°C to +125°C Hermetic Package

EXPLANATION OF TEST LEVELS

Test Level

I – 100% production tested.

II – 100% production tested at +25°C, and sample tested at

specified temperatures.

III – Sample tested only.

IV – Parameter is guaranteed by design and characterization

testing.

V – Parameter is a typical value only.

VI – All devices are 100% production tested at +25°C. 100%

production tested at temperature extremes for military
temperature devices; guaranteed by design and charac­terization testing for industrial devices.

PIN DESCRIPTIONS

Pin
No. Name Function

1 –SENSE Feedback loop connection for remote sensing

output voltage. Must always be connected to
output return for proper operation.

2 +SENSE Feedback loop connection for remote sensing

output voltage. Must always be connected to

for proper operation.

+V

OUT

3 ADJUST Adjusts output voltage setpoint.

4 STATUS Indicates output voltage is within ±5% of

nominal. Active high referenced to –SENSE
(Pin 1).

5V

AUX

Low level dc auxiliary voltage supply refer­enced to input return (Pin 10).

6 INHIBIT Power Supply Inhibit. Active low and refer-

enced to input return (Pin 10).

7 SYNC Clock synchronization input for multiple

units; referenced to input return (Pin 10).

8I

SHARE

Current share pin which allows paralleled

units to share current typically within ±5% at

full load; referenced to input return (Pin 10).

9 TEMP Case temperature indicator and temperature

shutdown override; referenced to input return

(Pin 10).
10 –V
11 +V
12 +V

IN

IN

OUT

Input Return.

+28 V Nominal Input Bus.

+5 V dc Output (ADDC02805SA).

+3.3 V dc Output (ADDC02803SC).
13 +V

OUT

+5 V dc Output (ADDC02805SA).

+3.3 V dc Output (ADDC02803SC).
14 +V

OUT

+5 V dc Output (ADDC02805SA).

+3.3 V dc Output (ADDC02803SC).
15 RETURN Output Return.
16 RETURN Output Return.
17 RETURN Output Return.

PIN CONFIGURATION

1

17

11

CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection.
Therefore, proper ESD precautions are recommended to avoid performance degradation or loss
of functionality.

REV. A

–3–

TOP

VIEW

12

64

57010 15 20 25 30 35 40 45 50 55 60 65

OUTPUT POWER – WATTS

ADDC02803SC/ADDC02805SA–Typical Performance Curves

82

80

28V

16.0

15.5

78

76

74

EFFICIENCY – %

72

70

68

10 10020 30 40 50 60 70 80 90

40V

OUTPUT POWER – Watts

18V

VIN = 28V

= 5V

V

O

= +258C

T

C

Figure 1. Efficiency vs. Line and Load at +25°C
(ADDC02805SA)

80

78

76

74

72

70

68

18V

28V

40V

15.0

14.5

14.0

INPUT VOLTAGE – V

13.5

13.0
30 5535 40 45 50

ADDC02803SC

ADDC02805SA

60 65 70 80 90 100

MAXIMUM POWER OUTPUT – Watts

Figure 4. Low Line Dropout vs. Load at +90°C Case
Temperature

5.100

5.050

5.000

OUT

V

4.950

66

64

57010 15 20 25 30 35

OUTPUT POWER – Watts

40 45 50 55 60 65

Figure 2. Efficiency vs. Line and Load at +25°C
(ADDC02803SC)

81

80

79

78

EFFICIENCY – %

77

76

75

–55

ADDC02805SA

ADDC02803SC

–35 –15 5 25 45 65

T

CASE

– 8C

85

Figure 3. Efficiency vs. Case Temperature (°C)
(at Nominal V

, 75% Max Load)

IN

4.900
–55 125–35 –15 5 25 45 65 85 105

T

CASE

Figure 5. Output Voltage vs. Case Temperature (°C)
(ADDC02805SA)

3.340

3.320

3.300

OUT

V

3.280

3.260
–55 75–45 –35 –25 –15 –5 5 15 25 35 45 55 65

T

CASE

85 95

Figure 6. Output Voltage vs. Case Temperature (°C)
(ADDC02803SC)

–4–

REV. A

ADDC02803SC/ADDC02805SA

FREQUENCY – Hz

0

–10

–90

10 50k100 1k 10k

–40

–60

–70

–80

–20

–30

–50

–100

|AS| – dB

100

10V

90

1V

10

0%

V

V

INHIBIT

O

2ms

Figure 7. Output Voltage Transient During Turn-On with
Minimum Load Displaying Soft Start When Supply Is
Enabled (ADDC02805SA)

100

1V

90

5V

10

0%

V

INHIBIT

V

O

0.2ms

50mV

10A

100

90

10

0%

50mV

I

O

V

O

50ms

Figure 10. Output Voltage Transient Response to
a 10 A to 20 A Step Change in Load with Zero Load
Capacitance (ADDC02803SC)

Figure 8. Output Voltage Transient During Turn-On with
Minimum Load Displaying Soft Start When Supply Is
Enabled (ADDC02803SC)

100

100mV

90

Figure 9. Output Voltage Transient Response to
a 10 A to 20 A Step Change in Load with Zero Load
Capacitance (ADDC02805SA)

REV. A

10

0%

10A

Figure 11. Audio Susceptibility (Magnitude of V

OUT/VIN

)

(ADDC02805SA)

0
–10

–20

–30

V

O

I

O

50ms

–40

–50

AS – dB

–60

–70

–80

–90

–100

10 50k100 1k 10k

FREQUENCY – Hz

Figure 12. Audio Susceptibility (Magnitude of V

OUT/VIN

)

(ADDC02803SC)

–5–

ADDC02803SC/ADDC02805SA

10

VIN = 28V

VIN = 18V

1

z – V

IN

zZ

0.1
VIN = 28V

VIN = 18V

0.01

0.01 1000.1 1 10
FREQUENCY – kHz

Figure 13. Incremental Input Impedance (Magnitude)
(ADDC02805SA)

10

VIN = 28V

1

100

10

V

– m

OUT

Z

1

0.1
10 100k100 1k 10k

FREQUENCY – Hz

Figure 16. Incremental Output Impedance (Magnitude)
(ADDC02803SC)

1mV

– V

IN

Z

0.1

0.01
10 100k100 1k 10k

FREQUENCY – Hz

VIN = 18V

Figure 14. Incremental Input Impedance (Magnitude)
(ADDC02803SC)

100

10

z – mV

OUT

zZ

1

0.1

0.01 1000.1 1 10
FREQUENCY – kHz

Figure 15. Incremental Output Impedance (Magnitude)
(ADDC02805SA)

Volts

100mV

2.00 MHz/DIV

Figure 17. Output Voltage Ripple Spectrum

(ADDC02803SC)

1mV

Volts

100mV

2.00 MHz/DIV

Figure 18. Output Voltage Ripple Spectrum

(ADDC02805SA)

–6–

REV. A