L6706 datasheet(37/47 Pages) STMICROELECTRONICS

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L6706

Output voltage monitor and protections

Doc ID 15698 Rev 2

37/47

15.5

Feedback disconnection

L6706 allows to protect the load from dangerous over voltage also in case of feedback

disconnection. The device is able to recognize both FB pin and FBG pin disconnections, as

shown in the Figure 21.

When VSEN pin is more than 500 mV higher then VPROG, the device recognize a FBG

disconnections. Viceversa, when CS- is more than 700 mV higher then VSEN, the device

recognize a FB disconnection.

In both of the previous condition the device stops switching with the MOSFETs permanently

OFF and drives high the OSC/FAULT pin. The condition is latched until VCC or OUTEN

cycled.

Figure 21.

Feedback disconnection

COMP

To GND_core

(Remote Sense)

ERROR

AMPLIFIER

FBG

VSEN

DROOP

To VCC_core

(Remote Sense)

RFB

VPROG

VREF

FBG

GND DROP

RECOVERY

DCR

PHASE

VOUT

CS+

CS-

DISCONNECTED

700mV

FBG

DISCONNECTED

500mV

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