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LM76003: Minimum On-Time

Part Number: LM76003

Hi

My customer has question.

Figure 30 shows the efficiency graph for fsw = 2000kHz.
In the case of VIN = 48, Vout = 5 V @ FPWM,2200 kHz, I think that Minimum On-Time (max = 95 ns) can not be satisfied.
However, although a graph of efficiency is shown, is this possible?
At this time,LM76003 is lowering the frequency?

Regard

T Kishi