L6738

Main oscillator

Doc ID 18133 Rev 1

19/32

7.1

Synchronization

The L6738 provides the user with the possibility to synchronize to an external signal when

properly connected to the SYNCH pin. Synchronization allows different converters to share

the same input filter reducing the resulting IRMS and so reducing the total capacitor count

required to sustain the load. Furthermore, synchronized systems generally exhibit higher

noise immunity and better regulation.

The device synchronizes the high-side MOSFET turn-on with the falling-edge of the synch

signal locking the internal sawtooth generator to the external signal.