Product # DQ63325QMA04

Phone 1-888-567-9596

Doc.# 005-2DQ632H Rev. C

7/7/04

Page 9

Performance Curves

48Vin 3.3/2.5Vout 40W

Quarter

Quarter

Brick Dual

Brick Dual

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

2.5V and 3.3V outputs at 50% rated load current. (see Fig. 23)

Figure 26: Output voltage ripple at nominal input voltage and 50%

1.0

1.2

1.4

1.6

1.8

2.0

2.2

2.4

2.6

2.8

3.0

0

2

4

6

8

1012

1416

1820

35 V

48 V

75 V

Figure 27: Output voltage vs. load current showing typical current limit

curves and converter shutdown points for the 2.5V output. 3.3V load is

at 0A.

1.4

1.6

1.8

2.0

2.2

2.4

2.6

2.8

3.0

3.2

3.4

3.6

024

6

8

10

12

14

35 V

48 V

75 V

Figure 28: Output voltage vs. load current showing typical current limit

curves and converter shutdown points for the 3.3V output. 2.5V load is

at 0A.

Figure 29: Load current for 2.5V output (10A/div) as a function of time

when the converter attempts to turn on into a 10 m

Ω short circuit.

Bottom trace is an expansion of the on-time portion of the top trace.

Figure 30: Load current for 3.3V output (10A/div) as a function of time

when the converter attempts to turn on into a 10 m

Ω short circuit.

Bottom trace is an expansion of the on-time portion of the top trace.

3.3Vout

2.5Vout