Datasheet

L6730 - L6730B Device description
Doc ID 11938 Rev 3 29/52
The phase shift between master and slaves is approximately done 180°.
5.12 Thermal shutdown
When the junction temperature reaches 150°C ±10°C, the device enters in thermal
shutdown.
Both MOSFETs are turned OFF and the soft-start capacitor is rapidly discharged with an
internal switch. The device does not restart until the junction temperature goes down to
120°C and, in any case, until the voltage at the soft-start pin reaches 500 mV.
5.13 Minimum ON-time T
ON(MIN)
The device can manage minimum ON times lower than 100 ns. This feature comes from the
control topology as well as from the particular L6730/B overcurrent protection system. In a
voltage mode controller, the current does not have to be sensed to perform regulation and,
in the case of L6730/B, it does not have to be sensed for the overcurrent protection either
because valley current protection can operate during the OFF time. The first advantage
related of this feature is the achievement of extremely low conversion ratios. Figure 25
shows a conversion from 14 V to 0.5 V at 820 kHz with a t
ON of about 50 ns. The ON time is
limited by the MOSFET turn-on and turn-off times.
Figure 24. Synchronization
PWM SIGNALS
INDUCTOR CURRENTS