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LM43600: in case of SYNC input(external clock input)

Part Number: LM43600
Other Parts Discussed in Thread: LM53600-Q1

Hi all

Would you mind if we ask LM43600?

In case of SYNC input(external clock input), if the light is light load, will the mode be PFM mode?
We would like to use forced PWM mode in case of SYNC input(external clock input).
Should we use LM53600-Q1 instead of LM43600?

Kind regards,

Hirotaka Matsumoto