Texas Instruments 28xxx Manual Do Utilizador
www.ti.com
CTR=zero
CTR=CMPB
X
En
SyncOut
Phase reg
Ext SyncIn
(optional)
(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
Vout1
Vin1
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