Analog Devices ADDC02808PB Datasheet

+V

OUT

RETURN

–V

IN

+V

IN

RETURN

RETURN

+V

OUT

+V

OUT

ADJUST
STATUS

V

AUX

INHIBIT

SYNC

I

SHARE

TEMP

FIXED

FREQUENCY

DUAL
INTERLEAVED
POWER TRAIN

+SENSE

OUTPUT

FILTER

INPUT SIDE

CONTROL

CIRCUIT

EMI FILTER

ADDC02808PB

–SENSE

OUTPUT SIDE

CONTROL

CIRCUIT

28 V, 200 W Pulsed DC/DC Converter

a

FEATURES
28 V dc Input, 8 V dc @ 25 A, 200 W Pulse Output
Integral EMI Filter
Ultrafast Transient Response
Minimal Output Voltage Deviation
Low Weight: 80 Grams
NAVMAT Derated
Many Protection and System Features

APPLICATIONS
Distributed Power Architecture for Driving T/R Modules
Motor and Actuator Drivers

GENERAL DESCRIPTION

The ADDC02808PB hybrid military dc/dc converter is com­pensated specifically for pulse applications where fast transient
response and minimum output voltage deviation are required.
It is also designed to deliver very high, pulsed output power.
The unit is designed for high reliability and high performance
applications where saving space and/or weight are critical.

The ADDC02808PB has been characterized over a wide variety
of load conditions. Its transient response has been set to insure
output stability over a broad range of load capacitance. For
applications that require factory modified compensation
optimized for a specific load, or for applications that require a
different output voltage than 8 V dc, contact the factory.

The ADDC02808PB is available in a hermetically sealed,
molybdenum based hybrid package and is easily heatsink
mountable. Three screening levels are available, including
military SMD.

with Integral EMI Filter

ADDC02808PB

FUNCTIONAL BLOCK DIAGRAM

PRODUCT HIGHLIGHTS

1. 120 W/cubic inch pulsed power density with an integral EMI
filter

2. Ultrafast transient response time with minimum output
voltage deviation

3. Light weight: 85 grams

4. Operational and survivable over a wide range of input condi­tions: 16 V–50 V dc; survives low line, high line

5. High reliability; NAVMAT derated

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

7. System level features include:
Current Sharing for Parallel Operation
Logic Level Disable
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

ADDC02808PB–SPECIFICATIONS

ELECTRICAL CHARACTERISTICS

(TC = +25ⴗC, VIN = 28 V dc ⴞ0.5 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 Units

INPUT CHARACTERISTICS

Steady State Operating Input Voltage Range1Full VI IO = 1.25 A to 25 A Pulsed 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°CVI 45 90 mA
Disabled Input Current +25°CVI 1 2 mA

OUTPUT CHARACTERISTICS

Output Voltage (V

) +25°CI I

O

2, 3

Line Regulation +25°CVI I
Load Regulation +25°CVI V

Output Ripple/Noise
Output Current (IO)

4

5

Output Overvoltage Protection +25°CV I
Output Current Limit +25°CV V
Output Short Circuit Current +25°CI 40 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

Step Changes In Load (min to max) +25°C I (Reference Section Entitled “Transient Response”)

Step Changes In Load (max to min) (Reference Section Entitled “Response at End

Soft Start Turn-On Time +25°CI I

THERMAL CHARACTERISTICS

Efficiency +25°CI I

Hottest Junction Temperature

5

CONTROL CHARACTERISTICS

Clock Frequency Full VI IO = 2 A 0.85 0.99 MHz

ADJUST (Pin 3) V ADJ +25°C I 3.1 3.2 3.3 V

STATUS (Pin 4)

V

OH

V

OL

V

(Pin 5)

AUX

V

(nom) +25°CI I

O

INHIBIT (Pin 6)

V

IL

I

IL

V

(Open Circuit) +25°CI 15 V

I

SYNC (Pin 7)

V

IH

I

IH

I

SHARE

6

(Pin 8) +25°CI I

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 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; tests performed at low continuous load and 200 W pulsed load.

4

C

= 1,000 µF. Output ripple/noise measured at converter output; may be smaller at external load capacitance. Unit is stable for C

LOAD

4,000 µF.

5

Refer to section entitled “Pulse Output Power vs. Pulse Length” for more information.

6

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

Specifications subject to change without notice.

Case Test ADDC02808PB

Full VI IO = 1.25 A to 25 A Pulsed 16 50 V

= 1.25 A to 25 A, VIN = 18 V to 40 V dc 7.92 8.00 8.08 V

O

Full VI IO = 1.25 A to 25 A, VIN = 18 V to 40 V dc 7.84 8.16 V
Full VI IO = 1.25 A to 20 A, VIN = 16 V to 50 V dc 7.84 8.16 V

= 25 A Pulsed, VIN = 18 V to 40 V dc 1 5 mV

O

= 28 V dc, IO = 1.25 A to 25 A Pulsed 2.5 10 mV

+25°CI I

IN

= 25 A, 5 kHz – 2 MHz BW 10 30 mV p-p

O

Full VI VIN = 18 V to 40 V dc, Pulsed 1.25 25 A

= 25 A, Open Remote Sense Connection 125 % VO nom

O

= 90% V

O

Nom 130 % IO max

OUT

of Pulse”)

= 25 A, From Inhibit High to Status High 6 10 ms

O

= 12.5 A 77.5

O

Min VI IO = 12.5 A 77.5 80 %
Max VI IO = 12.5 A 76 %

+25°CI I

= 25 A 73.5 76 %

O

Min VI IO = 25 A 73.5 %
Max VI IO = 25 A 71 %

+90°CV IO = 25 A 110 °C

+25°CI IOH = 400 µA2.44.0V
+25°CI I

= 1 mA 0.15 0.7 V

OL

= 5 mA, Load Current = 12.5 A 14.65 15.15 15.65 V

AUX

+25°CI 0.5 V
+25°CI V

= 0.5 V 1.2 mA

IL

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

= 20 A 2.45 2.55 2.65 V

O

ranging from 500 µF to

LOAD

REV. A–2–

ADDC02808PB

1

11

12

17

TOP

VIEW

ABSOLUTE MAXIMUM RATINGS*

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

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

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

I

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

ADDC02808PBKV –40°C to +85°C Hermetic Package
ADDC02808PBTV –55°C to +90°C Hermetic Package
5962-9763401HXC –55°C to +125°C Hermetic Package

(ADDC02808PBTV/QMLH)

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 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
+V

for proper operation.

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
13 +V
14 +V

IN

IN

OUT

OUT

OUT

Input Return.

+28 V Nominal Input Bus.

+8 V dc Output.

+8 V dc Output.

+8 V dc Output.
15 RETURN Output Return.
16 RETURN Output Return.
17 RETURN Output Return.

PIN CONFIGURATION

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–

WARNING!

ESD SENSITIVE DEVICE

ADDC02808PB–Typical Performance Curves

9

16.0

2V

10V

10

0%

100

90

1ms

V

O

V

INHIBIT

100mV

10

0%

100

90

100ms

V

O

82

80

78

76

74

PERCENTAGE

72

70

68

020

40 60 80 100

OUTPUT POWER – Watts

120 140 160 180 200

40V

28V

18V

Figure 1. Efficiency vs. Line and Load at +25°C
(Load Pulsewidth of 50 ms)

7

79

78

28VIN, 150W PEAK

1.0
28VIN, 150W PEAK

0.5

0.0

DEVIATION – %

OUT

V

–0.5

–1.0

–55 95–45 –35 –25 –15 –5

5 1525354555657585

T

CASE

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

78

77

EFFICIENCY – Percentage

77

76

–55 95–45

–35 –25 –15 –5

5 1525354555657585

T

CASE

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

, 75% Max Load, Load Pulsewidth

IN

Figure 5. Output Voltage Transient During Turn-On with

0.1 A Load Displaying Soft Start When Supply Is Enabled

of 50 ms)

15.5

15.0

14.5

INPUT VOLTAGE

14.0

13.5

13.0
140 200150

Figure 3. Low Line Dropout vs. Load at 90°C Case
Temperature (Load Pulsewidth of 50 ms)

160 170 180 190

PEAK OUTPUT POWER – Watts

–4–

Figure 6. Output Voltage Transient Response to
a 1 A to 25 A Step Change in Load, di/dt = 12 A/
with 1,000

µ

F Load Capacitance (R

= 10 mΩ)

ESR

µ

s,

REV. A

0

1

0.001

|Z

OUT

| – V

0.1

0.01

FREQUENCY – Hz

10 100k100 1k 10k

–10
–20

–30
–40
–50

|AS| – dB

–60
–70

–80
–90

–100

10 50k100

1k 10k

FREQUENCY – Hz

Figure 7. Audio Susceptibility (Magnitude of V

OUT/VIN

ADDC02808PB

)

Figure 9. Incremental Output Impedance (Magnitude)

1k

100

| – V

10

IN

|Z

1

0.1
10 100k100 1k 10k

FREQUENCY – Hz

Figure 8. Incremental Input Impedance (Magnitude)

5mV

1mV

0.5mV

VOLTS

100mV

50mV

020

10

FREQUENCY – MHz

Figure 10. Output Frequency Spectrum

REV. A –5–

ADDC02808PB–Typical EMI Curves & Test Setup for 28 VIN, 5 V dc Out, 100 W Converter

FREQUENCY – MHz

166

0.10.0001 0.001

106

126

66

EMISSION LEVEL – dB/pT

146

86

0.01

RE101 MIL-STD-461D

RE101–1

130

110

90

70

EMISSION LEVEL – dB mV

50

30

CONDUCTED EMISSIONS CE101

CE101–1 4.5 AMPS

FREQUENCY – MHz

0.010.0001 0.001

Figure 11. Conducted Emissions, MIL-STD-461D, CE101,
+28 V Hot Line 100 W Load

130

110

90

CONDUCTED EMISSIONS CE102

Figure 13. Radiated Emissions, MIL-STD-461D, RE101,
100 W Load

90

70

50

RADIATED EMISSIONS RE102

70

EMISSION LEVEL – dB mV

50

30

FREQUENCY – MHz

LIMIT 28VDC

1

Figure 12. Conducted Emissions, MIL-STD-461D, CE102,
+28 V Hot Line 100 W Load

LISN

LISN

TWO METERS OF

TWISTED CABLE

NOTE: 100mF CAPACITOR AND 1V RESISTOR PROVIDE STABILIZATION FOR 100mH DIFFERENTIAL SOURCE INDUCTANCE

INTRODUCED BY THE LISNs. REFER TO SECTION ON EMI CONSIDERATIONS FOR MORE INFORMATION.

Figure 15. Schematic of Test Setup for EMI Measurements

1V

100mF

100.01 0.1

2mF

82nF

82nF

EMISSION LEVEL – dB mV/m

–30

30

10

1 100 1000

FREQUENCY – MHz

RE102–2

100.01 0.1

Figure 14. Radiated Emissions, MIL-STD-461D, RE102,
Vertical Polarity, 100 W Load

+V

IN

–V

IN

GROUND PLANE

CASE

+V

OUT

RETURN

1/4V0.1mF

–6–

REV. A