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ADP1046A 100Watt
Evaluation board
C. SR softstart: This test shows the capability of the softstart ramp or fade in sequence applied to the synchronous
rectifiers. The 'Enable SR softstart' button was checked.
Figure 20 show a zoomed in snapshot of the duty cycle at the beginning and end of the softstart ramp.
Figure 18 – Progression of SR PWMs during SR softstart
Green trace: Output voltage
Red trace: SR1
Blue trace: SR2
Additional things to try:
a)
Implement different softstart timings in combination with different PS_ON delays.
b)
Use a dedicated softstart filter during softstart and choosing an aggressive normal mode filter.
c)
Use the filter transition feature to seamlessly change filters.
d)
Disable the OrFET allowing its body diode to conduct the output current. Then set different OTP thresholds.
e)
Use the SR Softstart to prevent a glitch in the output voltage.
f)
Enable softstart from pre-charge to reduce softstart time.
Figure 18 – Progression of SR PWMs during SR softstart
Figure 20 – Progression of SR PWMs during SR softstart
Green trace: Output voltage
Red trace: SR1
Blue trace: SR2
Rev. 1.3 | Page 14 of 55
Figure 19 – Progression of SR PWMs during SR softstart
Green trace: Output voltage
Red trace: SR1
Blue trace: SR2
PRD1386
Figure 18 to
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