LED7708 STMicroelectronics, LED7708 Datasheet - Page 43

• Manufacturer Part Number: LED7708
• Description: LED Lighting Drivers 16 Ch 85mA LED 3.6 to 36V 250kHz
• Manufacturer: STMicroelectronics

Specifications of LED7708

• Rohs: yes

LED7708
8.7
8.7.1
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:
Table 23.
The XFLT pin is an open drain output (active low) and is affected by the following faulty
conditions:
Table 24.
Figure 17. Internal signals connected to the XFLT pin
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:
Excessive channel voltage (LED short-circuit)
Overvoltage protection
Overtemperature alert
External MOSFET overcurrent (OC)
LED short-circuit
Detected fault
Open channel
Detected faulty conditions
XFAULT pin behavior
Boost output overvoltage (OV)
Overtemperature protection
Faulty Condition
Open channel
Doc ID 022698 Rev 1
CHSTA16:CHSTA01
CHSTA16:CHSTA01
Involved flag
OVPF
OTAF
Recommended operating conditions
Involved Section
Current generators
Boost controller
Whole device
XFLT status
Low
Low
Low
Low
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