Sw3 Enable Function - STMicroelectronics LED7707 Application Note

Configuration
Table 4.
Internal MOSFET
Output overvoltage
Thermal shutdown
LED short-circuit
Open row(s)
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.
10/17
Fault management summary
Fault
overcurrent
Device turned OFF (100 µA
occurrence, latched condition
MODE to GND
Power MOSFET turned off
Power MOSFET turned off (hysteretic regulation)
FAULT pin LOW. Device turned off.
Automatic restart after 30
Fault pin LOW
masking time), latched
condition (V =4.0 V)
th
Fault pin LOW
Device turned off at first
Doc ID 14893 Rev 1
MODE to VCC
Fault pin HIGH
FAULT pin LOW
°
C temperature drop.
FAULT pin HIGH
Faulty row(s) disconnected
(100 µs masking time)
AN2810