UCC28951: DCM mode switching to CCM mode timing

?? ?

Part Number: UCC28951
Other Parts Discussed in Thread: UCC28950

Hello:

I have questions

1.I currently have a 400V-12V 2.5KW design. When I use the DCM15.4K series 562R recommended by TIDA-020031, it switches to CCM at ILOAD6.6A and sends out OUTE and OUTF.

2.I used the UCC28950 PSIPCE model to simulate and found that it opened OUTE.OUTF at ILOAD9.6A.

3.Could you please recommend what percentage of 210A is needed to switch from DCM to CCM when using a 400V-12V 2.5KW power supply?

1 个月前

0 Daniel 1 个月前

TI__Mastermind 36815 points

您好

请始终相信测量结果。

突发模式入口点由系统设计决定。通常，当您想要启用突发模式时，会达到满载的5-10%。

0 ?? ? 1 个月前回复 Daniel

Prodigy 30 points

So, if I design a load of 12V/210A (2.5kW), I can switch from DCM to CCM at a 5%-10% current (10.5A-21A). Is this correct?
Will DCM efficiency still be good at 5%-10%?

0 Daniel 1 个月前回复 ?? ?

TI__Mastermind 36815 points

您好

从CCM到DCM的转换点由TMIN引脚配置。

效率在很大程度上取决于功率级设计，“良好”的定义是一个主观术语。

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UCC28951: DCM mode switching to CCM mode timing