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
CC
reaching UVLO level (fold back during overload),
• 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
CC
winding will not charge the V
CC
capacitor anymore and the V
CC
voltage will drop until UVLO is reached. To recharge the V
CC
capacitor, the internal
current source (I
(restart)(VCC))
will be switched ‘on’ to initiate a new start-up sequence as
described before. This Safe-Restart mode will persist until the controller detects no
faults or burst triggers.
Standby
The set goes to Standby in the following cases:
• After pressing the ‘standby’ key on the remote control.
• When the set is in protection mode.
In Standby, the power supply works in ‘burst mode’.
Burst mode can be used to reduce the power consumption below1 W at stand-by.
During this mode, the controller is active (generating gate pulses) for only a short time
and for a longer time inactive waiting for the next burst cycle.
To Next Page
Loading...
