Datasheet

CLKIOPHSEL
20 mA
SLAVE3
CLKIO
PHSEL
TPS40140
R3
R1
TPS40140
MASTER
SLAVE2
CLKIO
PHSEL
TPS40140
SLAVE1
CLKIO
PHSEL
TPS40140
SLAVE7
CLKIO
PHSEL
TPS40140
SLAVE6
TPS40140
SLAVE5
TPS40140
SLAVE4
TPS40140
ILIM2
ILIM2
ILIM2
ILIM2
BP5
10 kW
CLKIO
PHSEL
R2
CLKIO
PHSEL
CLKIO
PHSEL
TPS40140
SLUS660H –SEPTEMBER 2005–REVISED JUNE 2013 www.ti.com
5.27.3.6 Eight ICs Operation
To further increase the total current capability to sixteen phases, or to increase the number of outputs,
seven slave controllers can be added as shown in Figure 5-19.
Figure 5-19. Master Controller and Seven Slave Controllers, 16 Phases
In this configuration, the master senses that there are three slave controllers (due to the three resistors)
and distributes an eight-phase CLKIO signal. Slave1, slave2 and slave3 are turned on at 90°, 45°, and
135° respectively as before with three slaves. However, to get sixteen phases with an eight-phase clock,
both edges of the CLKIO signal are used to control the slaves. With the ILIM2 tied high on slave4, slave5,
slave6, and slave7 they turn on at the rising edge of CLKIO, while the master and slave1, slave2, and
slave3 turn on at the falling edge of CLKIO. If six slaves are desired, just delete one of the slaves from
Figure 5-19. The interleaving is not be perfect because there is 22.5° between the master and three
slaves. The deleted slave causes 45° between the two adjacent slaves. See Figure 5-20 for a phasing
details.
38 APPLICATION INFORMATION Copyright © 2005–2013, Texas Instruments Incorporated
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