Product # PQ30033QGA25

Phone 1-888-567-9596

www.synqor.com

Doc.# 005-2QG33LU Rev. B

4/28/05

Page 8

Input:

Input:

Output:

Output:

Current:

Current:

P

ackage:

18-60 V

18-60 V

3.3 V

3.3 V

25 A

25 A

Quarter-brick

Quarter-brick

T

pecification

Figure 17: Test set-up diagram showing measurement points for Input

Terminal Ripple Current (Figure 18), Input Reflected Ripple Current

(Figure 19) and Output Voltage Ripple (Figure 20).

source

impedance

DC/DC

Converter

See Fig. 19

See Fig. 18

See Fig. 20

ceramic

capacitor

10 µF,

100m

Ω ESR

tantalum

capacitor

47 µF,

<1Ω ESR

electrolytic

capacitor

i

S

i

C

Figure 18: Input Terminal Ripple Current, ic, at full rated output cur-

electrolytic capacitor (200 mA/div). See Figure 17.

inductor at nominal input voltage and rated load current (10 mA/div).

See Figure 17.

Figure 20: Output voltage ripple at nominal input voltage and rated

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

18 V

48 V

60 V

Figure 21: Output voltage vs. load current showing typical current limit

curves and converter shutdown points.

Figure 22: Load current (20A/div) as a function of time when the con-

verter attempts to turn on into a 10 m

Ωshort circuit. Top trace

(20ms/div) is an expansion of the on-time portion of the bottom trace.