L6714 datasheet(48/70 Pages) STMICROELECTRONICS

48 / 70 page

Output voltage monitor and protections

L6714

48/70

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:

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.

OVP

12.5

µA

⋅

OVP

12.5

µA

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