MCD10085 Rev. 1.1, 08-Jul-10 Page 25 of 30 www.power-one.com
SQM48 Series Data Sheet
SemiQ
TM
Family 25A DC-DC Converters
SQM48T/S25012 (1.2 Volts Out)
Fig. 1.2V.3: Turn-on transient at full rated load current (resis-
tive) with no output capacitor at Vin = 48 V, triggered via
ON/OFF pin. Top trace: ON/OFF signal (5 V/div.). Bottom
trace: output voltage (0.5 V/div.). Time scale: 1 ms/div.
Fig. 1.2V.5: Output voltage response to load current step-
change (5 A – 10 A – 5 A) at Vin = 48 V. Top trace: output vol-
tage (100 mV/div.). Bottom trace: load current (5 A/div.). Cur-
rent slew rate: 0.1 A/s. Co = 1 F ceramic. Time scale: 0.2
ms/div.
Fig. 1.2V.4: Turn-on transient at full rated load current (resis-
tive) plus 20,000 F at Vin = 48 V, triggered via ON/OFF pin.
Top trace: ON/OFF signal (5 V/div.). Bottom trace: output vol-
tage (0.5 V/div.). Time scale: 1 ms/div.
Fig. 1.2V.6: Output voltage response to load current step-
change (5 A – 10 A – 5 A) at Vin = 48 V. Top trace: output vol-
tage (100 mV/div.). Bottom trace: load current (5 A/div.). Cur-
rent slew rate: 5 A/s. Co = 450 F tantalum + 1 F ceramic.
Time scale: 0.2 ms/div.