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LED7708TR Datasheet(PDF) 43 Page - STMicroelectronics

Part # LED7708TR
Description  16 channels x 85 mA LED driver with boost controller and 4-wire serial interface
PDF  53 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

LED7708TR Datasheet(HTML) 43 Page - STMicroelectronics

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LED7708
Recommended operating conditions
Doc ID 022698 Rev 1
43/53
8.7
Fault management
The LED7708 includes some protection to prevent damage to itself and to the backlight. In
order to satisfy these requirements, the following protection has been implemented:
The XFLT pin is an open drain output (active low) and is affected by the following faulty
conditions:
Figure 17.
Internal signals connected to the XFLT pin
8.7.1
Overvoltage protection
The LED7708 protects itself and the external components from excessive output voltage by
monitoring the voltage at the VFB pin. The overvoltage threshold is given by the following
equation, where R1 and R2 are the resistors of the output divider:
Table 23.
Detected faulty conditions
Faulty Condition
Involved Section
Boost output overvoltage (OV)
Boost controller
External MOSFET overcurrent (OC)
Open channel
Current generators
Excessive channel voltage (LED short-circuit)
Overtemperature protection
Whole device
Table 24.
XFAULT pin behavior
Detected fault
Involved flag
XFLT status
Overvoltage protection
OVPF
Low
Overtemperature alert
OTAF
Low
Open channel
CHSTA16:CHSTA01
Low
LED short-circuit
CHSTA16:CHSTA01
Low



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