Analog Devices ADDC02828SA Datasheet

28 V/100 W DC/DC Converter

a

FEATURES
28 V dc Input, 28 V dc @ 3.6 A, 100 W Output
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 ADDC02828SA hybrid dc/dc converter with integral EMI
filter offers the highest power density of any dc/dc converter
available today with its features and in its power range. The
converter with integral EMI filter is a fixed frequency, 1 MHz,
square wave switching dc/dc power supply. It is not a variable
frequency resonant converter. In addition to many protection
features, this converter has system level features that allow it to
be used as a component in larger systems as well as a stand­alone power supply. The unit is designed for high reliability and
high performance applications where saving space and/or weight
is critical.

The ADDC02828SA is available in three screening grades; all
grades use a hermetically sealed, molybdenum based hybrid
package. Contact factory for MIL-STD-883 device availability.

with Integral EMI Filter

ADDC02828SA

FUNCTIONAL BLOCK DIAGRAM

– SENSE
+ SENSE

ADJUST
STATUS

V

AUX

INHIBIT

SYNC

I

SHARE

TEMP

–V
+V

PRODUCT HIGHLIGHTS

1. 60 W/cubic inch power density with an integral EMI filter
designed to meet all applicable requirements in MIL-STD­461D 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 Input Voltage Range section.

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

IN
IN

OUTPUT SIDE

CONTROL

CIRCUIT

INPUT SIDE

CONTROL

CIRCUIT

EMI FILTER

FIXED

FREQUENCY

DUAL
INTERLEAVED
POWER TRAIN

ADDC02828SA

OUTPUT

FILTER

RETURN
RETURN
SENSE
SENSE
+V

OUT

+V

OUT

REF
REF

REV. 0

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., 1997

ADDC02828SA–SPECIFICA TIONS

ELECTRICAL CHARACTERISTICS

(TC = +258C, VIN = 28 V dc 60.5 V dc, unless otherwise noted; full temperature range is

–558C to +908C; all temperatures are case and TC is the temperature measured at the center of the package bottom.)

Parameter Temp Level Conditions Min Typ Max Units

INPUT CHARACTERISTICS

Steady State Operating Input Voltage Range1Full VI IO = 0.36 A to 3.6 A 18 28 40 V
Abnormal Operating Input Voltage Range

(Per MIL-STD-704D)

1

Input Overvoltage Shutdown +25°C I 50 52.5 55 V
No Load Input Current +25°C VI 85 100 mA
Disabled Input Current +25°CVI 1 5 mA

OUTPUT CHARACTERISTICS

2, 3

Output Voltage (VO) +25°CI IO = 0.36 A to 3.6 A, VIN = 18 V to 40 V dc 27.44 28.00 28.56 V

Line Regulation +25°CVI IO = 3.6 A, VIN = 18 V to 40 V dc 10 60 mV
Load Regulation +25°CVI VIN = 28 V dc, IO = 0.36 A to 3.6 A 15 45 mV
Output Ripple/Noise

4

Output Current (IO) Full VI VIN = 18 V to 40 V dc 0.36 3.6 A
Output Overvoltage Protection +25°CV IO = 3.6 A, Open Remote Sense Connection 125 % VO Nom
Output Current Limit +25°CV VO = 90% V
Output Short Circuit Current +25°CI 11 A

ISOLATION CHARACTERISTICS

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

DYNAMIC CHARACTERISTICS

4

Maximum Output Voltage Deviation Due to

Step Change in Load +25°CI IO = 1.8 A to 3.6 A or 3.6 A to 1.8 A, di/dt = 0.5 A/µs 1.8 V

Response Time Due to Step Change in Load +25°CI IO = 1.8 A to 3.6 A or 3.6 A to 1.8 A, di/dt = 0.5 A/µs 150 µs
Soft Start Turn-On Time

5

THERMAL CHARACTERISTICS

Efficiency +25°CI IO = 2.2 A 81 85 %

Hottest Junction Temperature

6

CONTROL CHARACTERISTICS

Clock Frequency Full VI IO = 0.36 A 0.85 0.99 MHz
ADJUST (Pin 3) V ADJ +25°C I 5.5 5.6 5.7 V
STATUS (Pin 4)

V

OH

V

OL

V

(Pin 5)

AUX

VO (nom) +25°CI I

INHIBIT (Pin 6)

V

IL

I

IL

VI (Open Circuit) +25°CI 15 V

SYNC (Pin 7)

V

IH

I

IH

I

SHARE

7

(Pin 8) +25°CI IO = 3.6 A 2.70 2.80 2.90 V

TEMP (Pin 9) +25°C V 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 ensure 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 Thermal Characteristics section for more information.

7

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

Specifications subject to change without notice.

Case Test ADDC02828SA

Full VI IO = 0.36 A to 2.9 A 16 50 V

Full VI IO = 0.36 A to 3.6 A, VIN = 18 V to 40 V dc 26.88 29.12 V
Full VI IO = 0.36 A to 2.9 A, VIN = 16 V to 50 V dc 26.88 29.12 V

+25°CI IO = 3.6 A, 5 kHz – 2 MHz BW 50 100 mV p-p

Nom 130 % IO max

OUT

Time for V

to Return within 2% of Final Value

OUT

+25°CI IO = 3.6 A, From Inhibit High to Status High 15 20 ms

Full VI IO = 2.2 A 80 %
+25°CI IO = 3.6 A 81 85 %
Full VI IO = 3.6 A 80 %
+90°CV IO = 3.6 A 110 °C

+25°CI IOH = 400 µ A 2.4 4.0 V
+25°CI IOL = 1 mA 0.15 0.7 V

= 5 mA, Load Current = 3.6 A 12.85 13.1 13.35 V

AUX

+25°CI 0.5 V
+25°CI VIL = 0.5 V 1.2 mA

+25°C I 4.0 V
+25°CI VIH = 7.0 V 150 µA

–2–

REV. 0

ADDC02828SA

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 GUIDE

Operating
Temperature

Device Range (Case) Description

ADDC02828SAKV –40°C to +85°C Hermetic Package
ADDC02828SATV –55°C to +90°C Hermetic Package
ADDC02828SATV/883B* –55°C to +125°C Hermetic Package

*Contact factory.

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 charac-

terization testing for industrial devices.

PIN FUNCTION 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 that 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
13 +V

IN

IN
OUT
OUT

14 SENSE
15 SENSE

Input Return.

+28 V Nominal Input Bus.

+28 V dc Output.

+28 V dc Output.

Output Sense Reference.

REF

Output Sense Reference.

REF

16 RETURN Output Return.
17 RETURN Output Return.

PIN CONFIGURATION

1

17

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. 0

–3–

TOP

VIEW

11

12

ADDC02828SA–T ypical Performance Curves

88

VO = 28V

86

T = +258C

84

82

80
78

76

EFFICIENCY – %

74
72

70

68

10 20 30 40 60 70 80 90

18V

40V

28V

50 100

OUTPUT POWER – Volts

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

87

28V

IN

75W PEAK

86

85

1.00
28V

IN

75WATTS

0.50

0.00

DEVIATION – %

OUT

V

–0.50

–1.00

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

T

CASE

– °C

85

Figure 4. Output Voltage vs. Case Temperature (°C)

V

OUT

10V

84

EFFICIENCY – %

83

82

–35 –25 –15 –5 5 15 25 35 45 55 65

–55 75–45

T

CASE

– °C

Figure 2. Efficiency vs. Case Temperature (°C)
(at Nominal V

14.0

13.9

13.8

13.7

13.6

13.5

13.4

13.3

INPUT VOLTAGE – Volts

13.2

13.1

13.0

, 75% Max Load)

IN

8075 85 90

OUTPUT POWER – Watts

95

85

100

V

INHIBIT

10V

5ms

Figure 5. Output Voltage Transient During Turn-On with
Minimum Load Displaying Soft Start When Supply Is
Enabled

50µs500mV/Div

Figure 3. Low Line Dropout vs. Load at 90°C Case
Temperature

Figure 6. Output Voltage Transient Response to
a 1.8 A to 3.6 A Step Change in Load with Zero Load
Capacitance

–4–

REV. 0

1.0

1mV

100µV

VOLTS

2.00 MHz/Div

0

–10

–20

–30

–40

| – dB

S

–50

|A

–60

–70

–80

–90

–100

10 50k100 1k

FREQUENCY – Hz

10k

| – Ω

|Z

OUT

0.1

.01

.001

ADDC02828SA

10

100 10k 100k1k

FREQUENCY – Hz

Figure 7. Audio Susceptibility (Magnitude of V

10.0

28Vdc

1.0

| – Ω

IN

|Z

–0.01

–0.1

10

100 10k 100k1k

FREQUENCY – Hz

18Vdc

OUT/VIN

Figure 8. Incremental Input Impedance (Magnitude)

)

Figure 9. Incremental Output Impedance (Magnitude)

Figure 10. Output Voltage Ripple Spectrum

REV. 0

–5–