Input:

Input:

Output:

Output:

Current:

Current:

ackage:

18-36 V

18-36 V

3.3 V

3.3 V

25 A

(82.5W)

Quarter-brick

Quarter-brick

T

pecification

Product # PQ24033QGA25

Phone 1-888-567-9596

www.synqor.com

Doc.# 005-2QG233D Rev. B

08/17/06

Page 7

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

100µF electrolytic capacitor (500 mA/div). See Figure 13.

inductor at nominal input voltage and rated load current (20 mA/div).

See Figure 13.

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

load current (20 mV/div). Load capacitance: 1µF ceramic capacitor

and 10µF tantalum capacitor. Bandwidth: 20 MHz. See Figure 13.

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

4.5

5.0

05

10

15

20

25

30

35

Load Current (A)

18 V

24 V

36 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

See Fig. 15

See Fig. 14

See Fig. 16

ceramic

capacitor

10 µF,

100m

Ω ESR

tantalum

capacitor

100 µF,

≅0.33Ω ESR

electrolytic

capacitor

i

S

i

C