SQ48 DC-DC Series Data Sheet
36-75 VDC Input; 1.0-12 VDC Output
SQ48T/S05080 (8.0 Volt Out)
Fig. 8.0V.11: Output voltage response to load current
step-change (1.325A – 2.65A – 1.325A) at Vin = 48V.
Top trace: output voltage (200 mV/div.). Bottom trace:
load current (1 A/div.). Current slew rate: 0.1 A/μs.
Co = 1 μF ceramic. Time scale: 0.5 ms/div.
Fig. 8.0V.12: Output voltage response to load current
step-change (1.325A – 2.65A – 1.325A) at Vin = 48V.
Top trace: output voltage (200 mV/div.). Bottom trace:
load current (1 A/div.). Current slew rate: 5 A/μs.
Co = 94μF tantalum + 1μF ceramic. Time scale:
0.5 ms/div.
i S
i C
Semi Q Family
10 μ H
source
inductance
V source
33 μ F
ESR <1 ?
electrolytic
capacitor
TM
DC-DC
Converter
1 μ F
ceramic
capacitor
Vout
Fig. 8.0V.13: Output voltage ripple (50 mV/div.) at full
rated load current into a resistive load with Co = 10 μF
tantalum + 1μF ceramic and Vin = 48V. Time scale:
1μs/div.
Fig. 8.0V.14: Test Setup for measuring input reflected
ripple currents, i c and i s .
Rev6 11-Apr-2011
Page 16 of 64
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