Rev. 3.1

2/2011

Page 2 of 18

V•I CHIP CORP. (A VICOR COMPANY) 25 FRONTAGE RD. ANDOVER, MA 01810 800-735-6200

vicorpower.com

x 120

025A00

y

E

48

VTM

ATTRIBUTE

SYMBOL

CONDITIONS / NOTES

MIN

TYP

MAX

UNIT

Input voltage range

No external VC applied

26

55

VC applied

055

1

V/µs

Module latched shutdown,

24

26

V

No Load power dissipation

315

W

17

5.3

6.5

9

Inrush current peak

10

20

A

Ω

DC input current

7

A

Transfer ratio

K

1/4

V/ V

Output voltage

V

Output current (average)

25

A

Output current (peak)

37.5

A

Output power (average)

300

W

95.0

96.0

Efficiency (ambient)

93.5

%

94.5

95.5

Efficiency (hot)

η

HOT

94.5

95.6

%

Efficiency (over load range)

η

20%

80

%

Output resistance (cold)

4.9

6.7

9.0

m

Ω

Output resistance (ambient)

6.3

9.0

13.4

m

Ω

Output resistance (hot)

8.8

11.5

14.0

m

Ω

Switching frequency

1.85

1.95

2.05

MHz

Output ripple frequency

3.70

3.90

4.10

MHz

Output voltage ripple

150

285

mV

20 MHz BW, Section 12

Output inductance (parasitic)

Frequency up to 30 MHz,

600

pH

Simulated J-lead model

Output capacitance (internal)

47

µF

Output capacitance (external)

VTM Standalone Operation.

1000

µF

PROTECTION

Overvoltage lockout

Module latched shutdown

55.1

58.5

60

V

Overvoltage lockout

Effective internal RC filter

8

µs

response time constant

Output overcurrent trip

26

39

55

A

Short circuit protection trip current

26

A

Output overcurrent

Effective internal RC filter (Integrative).

5.3

ms

response time constant

Short circuit protection response time

From detection to cessation

1µs

of switching (Instantaneous)

Thermal shutdown setpoint

125

130

135

ºC

Reverse inrush current protection

Reverse Inrush protection disabled for this product

1.0 ABSOLUTE MAXIMUM VOLTAGE RATINGS

The absolute maximum ratings below are stress ratings only. Operation at or beyond these maximum ratings can cause permanent

damage to the device.

2.0 ELECTRICAL CHARACTERISTICS

Specifications apply over all line and load conditions unless otherwise noted; Boldface specifications apply over the temperature

MIN

MAX

UNIT

+ IN to - IN . . . . . . . . . . . . . . . . . . . . . . .

-1.0

60

PC to - IN . . . . . . . . . . . . . . . . . . . . . . . .

-0.3

20

TM to -IN . . . . . . . . . . . . . . . . . . . . . . . .

-0.3

7

VC to - IN . . . . . . . . . . . . . . . . . . . . . . . .

-0.3

20

MIN

MAX

UNIT

+ IN / - IN to + OUT / - OUT (hipot)........

2250

+ IN / - IN to + OUT / - OUT (working)...

60

+ OUT to - OUT.......................................

-1.0

16