PQ60033SMX15 Datasheet, PDF (9/15 Pages) SynQor Worldwide Headquarters – Output current limit and short circuit protection

Technical Specification
Input: 48V
Output: 3.3V
Current: 15A
See
Fig.
15
10µH
source
impedance
See
Fig.
14
See
Fig.
16
Vsource
100µF
< 1Ω ESR
electrolytic
capacitor
DC/DC
Converter
Vout
1µF
100µF
ceramic 100mΩ
capacitor ESR
electrolytic
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 current and
nominal input voltage with 10µH source impedance and 100µF electrolytic
capacitor (Ch1 100mA/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 (5 mA/div). (See Figure 13).
Figure 16: Output voltage ripple at nominal input voltage and rated load
current (20 mV/div). Load capacitance: one 1.0µF ceramic capacitor and one
100µF electrolytic capacitor. Bandwidth: 20 MHz. (See Figure 13).
6
5
4
3
2
35 Vin
1
48Vin
75 Vin
0
0
5
10
15
20
25
Load Current (A)
Figure 17: Output voltage vs. load current showing typical current limit curves
and converter shutdown points.
Figure 18: Load current (10A/div) as a function of time when the converter
attempts to turn on into a 1 mΩ short circuit. Top trace (100ms/div) is an
expansion of the on-time portion of the bottom trace.
Product # PQ60033SMx15
Phone [phone]
www.synqor.com
Doc.# 005-0005163 Rev. C
06/28/11
Page 9