Product # DQ65033QKA04

Phone 1-888-567-9596

Doc.# 005-2DQ653L Rev. B

11/11/04

Page 9

T

pecification

Input:

Input:

Outputs:

Outputs:

Current:

Current:

P

ackage:

35-75V

35-75V

5.0V & 3.3V

5.0V & 3.3V

40W

40W

Quarter-brick

Quarter-brick

inductor at nominal input voltage and rated load current (5 mA/div).

3.3V and 5.0V outputs at 50% rated load current. (see Fig. 23)

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

1.5

2.0

2.5

3.0

3.5

4.0

02468

10

12

14

16

18

35 V

48 V

75 V

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

curves and converter shutdown points for the 3.3V output. 5.0V load is

at 0A.

2.0

2.5

3.0

3.5

4.0

4.5

5.0

5.5

6.0

01

234

567

89

10

11

12

35 V

48 V

75 V

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

curves and converter shutdown points for the 5.0V output. 3.3V load is

at 0A.

Figure 29: 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.

Figure 30: Load current for 5.0V output (10A/div) as a function of time

when the converter attempts to turn on into a 10 m

Ω short circuit. Top

trace is an expansion of the on-time portion of the bottom trace.

3.3Vout

5.0Vout