L6713ATR datasheet(48/64 Pages) STMICROELECTRONICS

48 / 64 page

Output voltage monitor and protections

L6713A

48/64

Figure 22.

Output voltage protections and typical principle connections

17.3

Over voltage and programmable OVP

Once VCC crosses the turn-ON threshold and the device is enabled (OUTEN = 1), L6713A

provides an over voltage protection: when the voltage sensed by VSEN overcomes the OVP

threshold, the controller permanently switches on all the low-side MOSFETs and switches

OFF all the high-side MOSFETs in order to protect the load. The OSC/ FAULT pin is driven

high (5 V) and power supply or OUTEN pin cycling is required to restart operations.The OVP

Threshold varies according to the operative mode selected (See Table 12).

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 12. 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 = 12.5 μA current(See Table 5), the

programmed voltage becomes:

Filter OVP pin with 100 pF(max) vs. SGND.

17.4

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 -300 mV of the programmed voltage.

VCC

VCCDR1

VCCDR2

VCCDR3

+12V

+5V

2.2

BAT54C

μF

Vcc

UVLO

OVP

UVLO

VCC

Preliminary OVP Enabled

VSEN Monitored

No Protection

Provided

(OUTEN = 1)

Programmable OVP

VSEN Monitored

(OUTEN = 0)

Preliminary OVP

VSEN Monitored

OVP

12.5

μA

⋅

OVP

12.5

μA

--------------------

⇒

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