Philips 7629 Service Manual page 84

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 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.
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.
will be switched 'on' to initiate a new start-up sequence as
capacitor anymore and the V
CC
capacitor, the internal
CC
CC