Voltage Transformation Module

VT048A240T012FP

vicorpower.com

Rev. 1.0

Page 3 of 11

SPECIFICATIONS (CONT.)

WAVEFORMS

Figure 1 — Input reflected ripple current at full load and 48 Vf.

Ripple vs. Output Current

25

50

75

100

125

150

175

0

1.25

2.5

3.75

5

6.25

7.5

8.75

10

11.25 12.5

Output Current (A)

Figure 2 — Output voltage ripple vs. output current at 48 Vf with no POL

bypass capacitance.

Parameter

Min

Typ

Max

Unit

Note

Output voltage

13.8

26.5

Vdc

No load

13.0

25.8

Vdc

Full load

Rated DC current

0

12.5

Adc

Peak repetitive current

18.8

A

Max pulse width 1ms, max duty cycle 10%,

baseline power 50%

Short circuit protection set point

12.8

Adc

Module will shut down

Current share accuracy

5

10

%

See Parallel Operation on Page 7

Efficiency

Half load

95.0

95.7

%

See Figure 3

Full load

94.7

95.8

%

See Figure 3

Internal output inductance

1.1

nH

Internal output capacitance

7.7

µF

Effective value

Output overvoltage setpoint

26.5

Vdc

Module will shut down

Output ripple voltage

No external bypass

150

348

mVp-p

See Figures 2 and 5

3.3 µF bypass capacitor

13

mVp-p

See Figure 6

Effective switching frequency

3.0

3.4

3.8

MHz

Fixed, 1.7 MHz per phase

Line regulation

K

0.4950

1/2

0.5050

Load regulation

43.6

60.0

mΩ

See Figure 13

Transient response

Voltage overshoot

600

mV

Response time

200

ns

See Figures 7 and 8

Recovery time

1

µs

See Figures 7 and 8