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L6732C Arkusz danych(PDF) 18 Page - STMicroelectronics

Numer części L6732C
Szczegółowy opis  Soft-start and inhibit
PDF  32 Pages
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Producent  STMICROELECTRONICS [STMicroelectronics]
Strona internetowa  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6732C Arkusz danych(HTML) 18 Page - STMicroelectronics

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5 Device description
L6732C
18/32
5.11
Synchronization
The presence of many converters on the same board can generate beating frequency noise. To
avoid this it is important to make them operate at the same switching frequency. Moreover, a
phase shift between different modules helps to minimize the RMS current on the common input
capacitors. Figure 10. and Figure 11. shows the results of two modules in synchronization. Two
or more devices can be synchronized simply connecting together the SYNCH pins. The device
with the higher switching frequency will be the Master while the other one will be the Slave. The
Slave controller will increase its switching frequency reducing the ramp amplitude proportionally
and then the modulator gain will be increased.
To avoid a huge variation of the modulator gain, the best way to synchronize two or more
devices is to make them work at the same switching frequency and, in any case, the switching
frequencies can differ for a maximum of 50% of the lowest one. If, during synchronization
between two (or more) L6732C, it's important to know in advance which the master is, it's timely
to set its switching frequency at least 15% higher than the slave. Using an external clock signal
(fEXT) to synchronize one or more devices that are working at a different switching frequency
(fSW) it is recommended to follow the below formula:
The phase shift between master and slaves is approximately 180°.
Figure 10. Synchronization: PWM Signal
Figure 11. Synchronization: Inductor Currents
SW
EXT
SW
f
f
f
⋅
≤
≤
3
,
1
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