ADDC02808PB datasheet(2/20 Pages) AD

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ADDC02808PB–SPECIFICATIONS

ELECTRICAL CHARACTERISTICS

Case

Test

ADDC02808PB

Parameter

Temp

Level

Conditions

Min

Typ

Max

Units

INPUT CHARACTERISTICS

Steady State Operating Input Voltage Range1

Full

IO = 1.25 A to 25 A Pulsed

Abnormal Operating Input Voltage Range

(Per MIL-STD-704D)1

Full

IO = 1.25 A to 25 A Pulsed

Input Overvoltage Shutdown

+25

°C

52.5

No Load Input Current

+25

°CVI

Disabled Input Current

+25

°CVI

OUTPUT CHARACTERISTICS2, 3

Output Voltage (VO)

+25

°CI

IO = 1.25 A to 25 A, VIN = 18 V to 40 V dc

7.92

8.00

8.08

Full

IO = 1.25 A to 25 A, VIN = 18 V to 40 V dc

7.84

8.16

Full

IO = 1.25 A to 20 A, VIN = 16 V to 50 V dc

7.84

8.16

Line Regulation

+25

°CVI

IO = 25 A Pulsed, VIN = 18 V to 40 V dc

Load Regulation

+25

°CVI

VIN = 28 V dc, IO = 1.25 A to 25 A Pulsed

2.5

Output Ripple/Noise4

+25

°CI

IO = 25 A, 5 kHz – 2 MHz BW

mV p-p

Output Current (IO)

Full

VIN = 18 V to 40 V dc, Pulsed

1.25

Output Overvoltage Protection

+25

°CV

IO = 25 A, Open Remote Sense Connection

125

% VO nom

Output Current Limit

+25

°CV

VO = 90% VOUT Nom

130

% IO max

Output Short Circuit Current

+25

°CI

ISOLATION CHARACTERISTICS

Isolation Resistance

+25

°C

Input to Output or Any Pin to Case at 500 V dc

100

Ω

DYNAMIC CHARACTERISTICS4

Step Changes In Load (min to max)

+25

°C

(Reference Section Entitled “Transient Response”)

Step Changes In Load (max to min)

(Reference Section Entitled “Response at End

of Pulse”)

Soft Start Turn-On Time

+25

°CI

IO = 25 A, From Inhibit High to Status High

THERMAL CHARACTERISTICS

Efficiency

+25

°CI

IO = 12.5 A

77.5

Min

IO = 12.5 A

77.5

Max

IO = 12.5 A

+25

°CI

IO = 25 A

73.5

Min

IO = 25 A

73.5

Max

IO = 25 A

Hottest Junction Temperature5

+90

°CV

IO = 25 A

110

°C

CONTROL CHARACTERISTICS

Clock Frequency

Full

IO = 2 A

0.85

0.99

MHz

ADJUST (Pin 3) V ADJ

+25

°C

3.1

3.2

3.3

STATUS (Pin 4)

VOH

+25

°CI

IOH = 400

µA2.4

4.0

VOL

+25

°CI

IOL = 1 mA

0.15

0.7

VAUX (Pin 5)

VO (nom)

+25

°CI

IAUX = 5 mA, Load Current = 12.5 A

14.65 15.15

15.65

INHIBIT (Pin 6)

VIL

+25

°CI

0.5

IIL

+25

°CI

VIL = 0.5 V

1.2

VI (Open Circuit)

+25

°CI

SYNC (Pin 7)6

VIH

+25

°CI

4.0

IIH

+25

°CI

VIH = 7.0 V

175

µA

ISHARE (Pin 8)

+25

°CI

IO = 20 A

2.45

2.55

2.65

TEMP (Pin 9)

+25

°C

3.90

NOTES

150 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.

2Measured at the remote sense points.

3Unit regulates output voltage to zero load; tests performed at low continuous load and 200 W pulsed load.

LOAD = 1,000

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

LOAD ranging from 500

µF to

4,000

µF.

5Refer to section entitled “Pulse Output Power vs. Pulse Length” for more information.

6Unit has internal pull-down; refer to section entitled Pin 7 (SYNC).

Specifications subject to change without notice.

REV. A

–2–

(TC = +25 C, VIN = 28 V dc

0.5 V dc, unless otherwise noted; full temperature range is

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

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