Datasheet

CLKIOPHSEL
20 mA
R2
R1
TPS40140
MASTER
SLAVE1
CLKIO
PHSEL
TPS40140
SLAVE2
CLKIO
PHSEL
TPS40140
10 kW
TPS40140
www.ti.com SLUS660H –SEPTEMBER 2005–REVISED JUNE 2013
5.27.3.3 Three ICs Operation
To increase the total current capability to six phases, or to increase the number of outputs, two slave
controllers can be added as shown in Figure 5-16. In this configuration for perfect interleaving, the master
and slaves are 120° out-of-phase. The CLKIO signal has six clocks for each cycle of the switching period;
therefore, the switching period is reduced. In this six-phase mode, the switching frequency is increased
33%.
Figure 5-16. Master Controller and Two Slave Controllers, Six Phases
In this configuration, the master senses that there are two slave controllers, and distributes a six-phase
CLKIO signal. The slave controllers sense the voltage on their PHSEL pins, and delay the proper number
of CLKIO pulses to be 60° or 120° out-of-phase with the master.
5.27.3.4 Four ICs Operation
To further increase the total current capability to eight phases, or to increase the number of outputs, three
slave controllers can be added as shown in Figure 5-17
Copyright © 2005–2013, Texas Instruments Incorporated APPLICATION INFORMATION 35
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