0

5

10

15

20

25

30

35

40

45

0

2540

5570

85

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

50 LFM (0.25 m/s)

Figure 7: Maximum output power derating curves vs. ambient air tem-

perature for airflow rates of 50 LFM through 400 LFM with air flowing

from output to input (nominal input voltage).

Product # PQ60050HPA45

Phone 1-888-567-9596

Doc.# 005-2HP650K Rev. C

4/16/04

Page 6

Figure 8: Thermal plot of converter at 36 amp load current (180 Watts)

converter from output to input (nominal input voltage).

Figure 9: Turn-on transient at full load (resistive load) (10 ms/div).

Input voltage pre-applied. Top Trace: Vout (2V/div). Bottom Trace:

ON/OFF input (5V/div)

Figure 10: Turn-on transient at zero load (10 ms/div).

Top Trace: Vout (2V/div)

Bottom Trace: ON/OFF input (5V/div)

50% of Iout(max); dI/dt = 0.1A/µs). Load cap: 15µF, 450 m

and 1µF ceramic cap. Top trace: Vout (200mV/div), Bottom trace: Iout (20A/div).

50% of Iout(max): dI/dt = 5A/µs). Load cap: 470µF, 15 m

and 1µF ceramic cap. Top trace: Vout (200mV/div), Bottom trace: Iout (20A/div).

Half

Half

Brick

Brick

Performance Curves

48Vin 5.0Vout 45A