Product # PQ60025EGL20

Phone 1-888-567-9596

Doc.# 005-2EG625D Rev. C

11/6/03

Page 7

Performance Curves

48Vin 2.5Vout 20A

Eighth

Eighth

Brick

Brick

Figure 14: Input Terminal Ripple Current, ic, at full rated output cur-

electrolytic capacitor (200 mA/div). See Figure 13.

inductor at nominal input voltage and rated load current (5 mA/div).

See Figure 13.

Figure 16: Output voltage ripple at nominal input voltage and rated

Figure 13: Test set-up diagram showing measurement points for Input

Terminal Ripple Current (Figure 14), Input Reflected Ripple Current

(Figure 15) and Output Voltage Ripple (Figure 16).

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

0

5

10

15

20

25

30

35 V

48 V

75 V

Figure 17: Output voltage vs. load current showing typical current limit

curves and converter shutdown points.

Figure 18: Load current (10A/div) as a function of time when the con-

verter attempts to turn on into a 10 m

Ω short circuit. Top trace

(2.5ms/div) is an expansion of the on-time portion of the bottom trace.

source

impedance

DC/DC

Converter

Figure 15

Figure 14

Figure 16

ceramic

capacitor

10 µF,

100m

Ω ESR

tantalum

capacitor

47 µF,

<1

Ω ESR

electrolytic

capacitor

i

S

i

C