L6714 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
L6714
STMicroelectronics
'L6714' PDF : 70 Pages View PDF
Output voltage monitor and protections
L6714
16.3
Over voltage and programmable OVP
Once VCC crosses the turn-ON threshold and the device is enabled (OUTEN = 1), L6714
provides an Over Voltage Protection: when the voltage sensed by VSEN overcomes the
OVP threshold, the controller permanently switches on all the low-side MOSFET and
switches off all the high-side MOSFET in order to protect the load. The OSC/ FAULT pin is
driven high (5V) and power supply or OUTEN pin cycling is required to restart
operations.The OVP Threshold varies according to the operative mode selected (See
Table 10).
The OVP threshold can be also programmed through the OVP pin: leaving the pin floating, it
is internally pulled-up and the OVP threshold is set according to Table 10. Connecting the
OVP pin to SGND through a resistor ROVP, the OVP threshold becomes the voltage present
at the pin. Since the OVP pin sources a constant IOVP = 12.5µA current(See Table 10), the
programmed voltage becomes:
OVPTH = ROVP ⋅ 12.5µA
⇒
ROVP
=
-O-----V----P----T---H--
12.5µA
Filter OVP pin with 100pF(max) vs. SGND.
16.4
PGOOD (Only for AMD mode)
It is an open-drain signal set free after the soft-start sequence has finished. It is pulled low
when the output voltage drops below -300mV of the programmed voltage.
48/70
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