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Over Temperature protection
When the junction temperature exceeds the thermal shutdown temperature (typ. 140º
C), the IC will disable the driver. When the V
voltage drops to UVLO, the V
CC
CC
capacitor will be recharged to the V(start) level. If the temperature is still too high, the
V
voltage will drop again to the UVLO level (Safe-Restart mode). This mode will
CC
persist until the junction temperature drops 8 degrees typically below the shutdown
temperature.
Mains dependent operation enabling level
To prevent the supply from starting at a low input voltage, which could cause audible
noise, a mains detection is implemented (Mlevel). This detection is provided via pin 8,
which detects the minimum start-up voltage between 60 and 100 V. As previous
mentioned, the controller is enabled between 60 and 100 V.
An additional advantage of this function is the protection against a disconnected buffer
capacitor (C
). In this case, the supply will not be able to start-up because the V
IN
CC
capacitor will not be charged to the start-up voltage.
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