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LED7706TR Datasheet(PDF) 26 Page - STMicroelectronics

Part # LED7706TR
Description  6-rows 30 mA LEDs driver with boost regulator for LCD panels backlight
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

LED7706TR Datasheet(HTML) 26 Page - STMicroelectronics

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Fault management
LED7706
26/31
8.3
Open LED fault
In case a row is not connected or a LED fails open, the device has two different behaviors
according to the MODE pin status.
Connecting the MODE pin to SGND, the LED7706 behaves in a different manner: as soon
as an open row is detected, the FAULT pin is tied low and the device is turned off. The
internal logic latches this status: to restore the normal operation, the device must be
restarted by toggling the EN pin or performing a Power-On Reset (POR occurs when the
voltage at the LDO5 pin falls below the lower UVLO threshold and subsequently rises above
the upper one).
If the MODE pin is high (i.e. connected to AVCC), the open row is excluded from the control
loop and the device continues to work properly with the remaining rows. The FAULT pin is
not affected. Thus, if less than six rows are used in the application, the MODE pin must be
set high.
8.4
Shorted LED fault
When a LED is shorted, the voltage across the related current generator increases of an
amount equal to the missing voltage drop of the faulty LED. Since the feedback voltage on
each active generator is constantly compared with a fault threshold VTH,FAULT, the device
detects the faulty condition and acts according to the MODE pin status.
If the MODE pin is low, the fault threshold is VTH,FAULT = 3.4 V. When the voltage across a
row is higher than this threshold, the FAULT pin is set low and the device is turned off. The
internal logic latches this status until the EN pin is toggled or a POR is performed.
In case the MODE pin is connected to AVCC, the fault threshold is set to 6 V. The LED7706
simply disconnects the rows whose voltage is higher than the threshold and the FAULT pin
is forced low. This option is also useful to avoid undesired triggering of the shorted-LED
protection simply due to the high voltage drop spread across the LEDs.


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