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CTR=zero
CTR=CMPB
X
En
SyncOut
Phase reg
Ext SyncIn
(optional)
EPWM1A
EPWM1B
SyncOut
Phase reg
CTR=CMPB
CTR=zero
X
En
EPWM2B
EPWM2A
Master2
Master1
SyncIn
CTR=zero
CTR=CMPB
SyncOut
X
EPWM3B
Phase reg
Master3
En
EPWM3A
1
2
3
Φ=X
Φ=X
Φ=X
CTR=zero
CTR=CMPB
SyncOut
X
EPWM4B
Phase reg
Master4
En
EPWM4A
3
Φ=X
Buck #1
Vout1Vin1
EPWM1A
Buck #2
Vin2
EPWM2A
Vout2
Buck #4
Buck #3
Vin3
EPWM4A
Vin4
EPWM3A
Vout3
Vout4
SyncIn
SyncIn
SyncIn
Controlling Multiple Buck Converters With Independent Frequencies
Figure 3-3. Control of Four Buck Stages. Here F
PWM1
≠ F
PWM2
≠ F
PWM3
≠ F
PWM4
NOTE: Θ = X indicates value in phase register is a "don't care"
72 Applications to Power Topologies SPRU791D – November 2004 – Revised October 2007
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