Analog Devices ADP1046A User Manual page 13

ADP1046A 100Watt
Evaluation board
Figure 14 – Softstart ramp, 48VDC, 8A load, with synchronous rectifiers
enabled during softstart.
Green trace: Output voltage
Yellow trace: Output load current
Red trace: SR signals
B. Softstart ramp and SR blanking: Figure 16 and Figure 17 show the startup sequence with the synchronous
rectifiers enabled/disabled with a 20ms and 40ms softstart ramp respectively.
This test was conducted by monitoring the output voltage (J4 and J5) and the test points SR1/SR2 during a startup
condition. The 'Blank SR during softstart check box and the 'Softstart ramp rate' dropdown menu were appropriately
selected.
Figure 16 - 40ms softstart, 48VDC, 8A load, with synchronous rectifiers
disabled during softstart
Upper trace: Output voltage, 5V/div, 20ms/div
Lower trace: Test point SR1, 2V/div, 20ms/div
Figure 15 - Startup with softstart from pre-charge
Figure 17 - 20ms softstart, 48VDC, 8A load, with synchronous rectifiers
Upper trace: Output voltage, 5V/div, 20ms/div
Lower trace: Test point SR1, 2V/div, 20ms/div
Rev. 1.3 | Page 13 of 55
PRD1386
Green trace: Output voltage
Yellow trace: Output load current
disabled during softstart