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Figure: Different supply modes
Safe-Restart Mode
This mode is introduced to prevent the components from being destroyed during
eventual system fault conditions. It is also used for the Burst mode. The Safe-Restart
mode will be entered if it is triggered by one of the following functions:
Over voltage protection,
Short winding protection,
Maximum 'on time' protection,
V
reaching UVLO level (fold back during overload),
CC
Detecting a pulse for Burst mode,
Over temperature protection.
When entering the Safe-Restart mode, the output driver is immediately disabled and
latched. The V
winding will not charge the VCC capacitor anymore and the V
CC
voltage will drop until UVLO is reached. To recharge the V
current source (I
(restart)(VCC)
described before. This Safe-Restart mode will persist until the controller detects no
faults or burst triggers.
) will be switched 'on' to initiate a new start-up sequence as
capacitor, the internal
CC
CC
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