Configuration

AN2810

10/17

Doc ID 14893 Rev 1

7.3

SW3 enable function

The terminals of switch SW3 are connected on one side to the EN pin and on the other side

to ground. Therefore, when the switch is not pressed, the EN pin is floating, which implies

that the device is working. Pressing the SW3 pin connects the EN pin to ground. When SW3

is released, the device re-starts (a soft-start is performed). The SW3 switch can be activated

whenever a new startup is required or to escape a latched condition.

Table 4.

Fault management summary

Fault

MODE to GND

MODE to VCC

Internal MOSFET

overcurrent

Fault pin HIGH

Power MOSFET turned off

Output overvoltage

FAULT pin LOW

Power MOSFET turned off (hysteretic regulation)

Thermal shutdown

FAULT pin LOW. Device turned off.

LED short-circuit

Fault pin LOW

Device turned OFF (100 µA

masking time), latched

Open row(s)

Fault pin LOW

Device turned off at first

occurrence, latched condition

FAULT pin HIGH

Faulty row(s) disconnected

(100 µs masking time)