L6731B

Device description

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5.11

The device can manage minimum on-times lower than 100ns. This feature comes down from

the control topology and from the particular over-current-protection system of the L6731B. In

fact, in a voltage mode controller the current has not to be sensed to perform the regulation

and, in the case of L6731B, neither for the over-current protection, given that during the off-time

the valley-current-protection can operate in every case. The first advantage related to this

feature is the possibility to realize extremely low conversion ratios. Figure 10. shows a

The on-time is limited by the turn-on and turn-off times of the MOSFETs.

Figure 10. 14V -> 0.3V@500KHz, 5A

50ns

VPHASE