PQ60025QGA25 Datasheet, PDF (7/13 Pages) SynQor Worldwide Headquarters – 25 Amp, No Heatsink, Isolated DC/DC Converter

Performance Curves
Quarter
Brick
48Vin 2.5Vout 25A
Figure 15
10 µH
source
impedance
Figure 14
Figure 16
i_S
V_SOURCE
i_C
47 µF,
<1Ω ESR
electrolytic
capacitor
DC/DC
Converter
V_OUT
1 µF 10 µF,
ceramic _{100mΩ ESR}
capacitor _tantalum
capacitor
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).
Figure 14: Input Terminal Ripple Current, ic, at full rated output cur-
rent and nominal input voltage with 10µH source impedance and 47µF
electrolytic capacitor (100 mA/div). See Figure 13.
Figure 15: Input reflected ripple current, is, through a 10 µH source
inductor at nominal input voltage and rated load current (10 mA/div).
See Figure 13.
3.0
2.5
2.0
1.5
1.0
0.5
36 V
48 V
75 V
0.0
0
5
10
15
20
25
30
Load Current (A)
Figure 17: Output voltage vs. load current showing typical current limit
curves and converter shutdown points.
Product # PQ60025QGA25
Phone [phone]
Figure 16: Output voltage ripple at nominal input voltage and rated
load current (20 mV/div). Load capacitance: 1µF ceramic capacitor
and 10µF tantalum capacitor. Bandwidth: 20 MHz. See Figure 13.
Figure 18: Load current (20A/div) as a function of time when the con-
verter attempts to turn on into a 10 mΩshort circuit. Top trace
(2.5ms/div) is an expansion of the on-time portion of the bottom trace.
Doc.# 005-2QG625D Rev. B
6/26/02
Page 7