Input:

Input:

Output:

Output:

Current:

Current:

ackage:

35-75 V

35-75 V

48 V

48 V

3 A

(144W)

Quarter-brick

Quarter-brick

T

pecification

Product # PQ60480QTA03

Phone 1-888-567-9596

www.synqor.com

Doc.# 005-2QT648C Rev. A

9/4/07

Page 7

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

electrolytic capacitor (100 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

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).

source

impedance

DC/DC

Converter

See Fig. 15

See Fig. 14

See Fig. 16

ceramic

capacitor

15 µF,

100mW ESR

tantalum

capacitor

47 µF,

@1W ESR

electrolytic

capacitor

i

S

i

C

0

5

10

15

20

25

30

35

40

45

50

55

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

Load Current (A)

35 Vin

48 Vin

75 Vin

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

curves and converter shutdown points.

Figure 18: Load current (5A/div) as a function of time when the con-

verter attempts to turn on into a 1 m

W short circuit. Top trace

(2ms/div) is an expansion of the on-time portion of the bottom trace.