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L6732C Fiches technique(PDF) 19 Page - STMicroelectronics

No de pièce L6732C
Description  Soft-start and inhibit
PDF  32 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6732C Fiches technique(HTML) 19 Page - STMicroelectronics

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L6732C
5 Device description
19/32
5.12
Minimum on-time (TON, MIN)
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 L6732C. In
fact, in a voltage mode controller the current has not to be sensed to perform the regulation
and, in the case of L6732C, 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 12. shows a
conversion from 14V to 0.3V at 500KHz with a TON of about 50ns.
The on-time is limited by the turn-on and turn-off times of the MOSFETs.
Figure 12. 14V -> 0.3V@500KHz, 5A
50ns
VPHASE
IL
VOUT
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