Product # PQ60120QTA12

Phone 1-888-567-9596

www.synqor.com

Doc.# 005-2QT612C Rev. A

10/4/04

Page 7

T

pecification

Input:

Input:

Output:

Output:

Current:

Current:

ackage:

35-75 V

35-75 V

12 V

12 V

12 A

12 A

Quarter-brick

Quarter-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).

source

impedance

DC/DC

Converter

See Fig. 15

See Fig. 14

See Fig. 16

ceramic

capacitor

10 µF,

100m

Ω ESR

tantalum

capacitor

47 µF,

≅1Ω ESR

electrolytic

capacitor

i

S

i

C

0

2

4

6

8

10

12

14

02

468

10

12

14

16

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 (5A/div) as a function of time when the con-

verter attempts to turn on into a 1 m

Ω

short circuit. Top trace

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