l6730cqtr STMicroelectronics, l6730cqtr Datasheet - Page 27

• Manufacturer Part Number: l6730cqtr
• Description: Adjustable Step-down Controller With Synchronous Rectification
• Manufacturer: STMicroelectronics

L6730C - L6730D
5.12
5.13
Figure 22. 14V -> 0.5V@820KHz, 5A
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 500mV.
Minimum on-time (T
The device can manage minimum on-times lower than 100ns. This feature comes from the
control topology and from the particular over-current-protection system of the L6730C -
L6730D. In fact, in a voltage mode controller the current has not to be sensed to perform the
regulation and, in the case of L6730C - L6730D, neither for the over-current protection, given
that during the off-time the valley-current-protection can operate. The first advantage related to
this feature is the possibility to realize extremely low conversion ratios.
conversion from 14V to 0.5V at 820KHz with a T
turn-on and turn-off times of the MOSFETs.
ON, MIN
50ns
)
ON
of about 50ns. The on-time is limited by the
Figure 22.
Device description
shows a
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