QM48T50012 DC-DC Converter Data Sheet
36-75 VDC Input; 1.2 VDC @ 50A Output
Fig. 28: Load current Iout1 into a 10 m ? short circuit on Vout1
during restart, with Vout2 open (no load), at Vin = 48 V. Ch2 =
Iout1 (20 A/div, 20 ms/div). ChB = Iout1 (20 A/div, 1 ms/div) is
an expansion of the on-time portion of Iout1.
Fig. 29: Load current Iout2 into a 10 m ? short circuit on Vout2
during restart, with Vout1 open (no load), at Vin = 48 V. Ch2 =
Iout2 (20 A/div, 20 ms/div). ChB = Iout2 (20 A/div, 1 ms/div) is
an expansion of the on-time portion of Iout2.
i S
i C
Q Family
1 μ F
10 μ H
source
inductance
V source
33 μ F
ESR <1 ?
electrolytic
capacitor
TM
DC/DC
Converter
1 μ F
ceramic
capacitor Vout2
Vout1
ceramic
capacitor
Fig. 30: Output voltage ripple at full rated load current into a
resistive load on both outputs with Co = 1uF (ceramic) and Vin
= 48 V. Ch2 = Vout2, Ch1 = Vout1 (both 20 mV/div). Time
scale: 1 μ s/div.
Fig. 31: Test setup for measuring input reflected ripple cur-
rents, i c and i s .
MAY 08, 2003 revised to NOV 13, 2006
Page 14 of 15
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