RM0440 Rev 4 955/2126
RM0440 High-resolution timer (HRTIM)
1083
Figure 264. Buck with synchronous rectification
27.4.3 Multiphase converters
Multiphase techniques can be applied to multiple power conversion topologies (buck,
flyback). Their main benefits are:
• Reduction of the current ripple on the input and output capacitors
• Reduced EMI
• Higher efficiency at light load by dynamically changing the number of phases (phase
shedding)
The HRTIM manages multiple converters. The number of converters that can be controlled
depends on the topologies and resources used (including the ADC triggers):
• 5 buck converters with synchronous rectification (SR), using the master timer and the 5
timers
• 4 buck converters (without SR), using the master timer and 2 timers
Figure 265 presents the topology of a 3-phase interleaved buck converter.
Figure 265. 3-phase interleaved buck converter
MS32346V2
PER
CMP2
CMP1
ADC ADC ADC
TIMA
counter
HRTIM_CHA1
HRTIM_CHA2
TIMA
outputs
Synchronous Rectification (SR) active
SR disabled
MS32347V3
HRTIM
_CHA1
HRTIM
_CHB1
HRTIM
_CHC1
V
IN
V
OUT
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