TPS53851 datasheet(35/64 Pages) TI1 | DUAL OR 2-PHASE, STACKABLE CONTROLLER

Part No.	TPS53851

Description	DUAL OR 2-PHASE, STACKABLE CONTROLLER

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Manufacturer	TI1 [Texas Instruments]

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CLKIO

PHSEL

20 mA

R2

R1

TPS53851

MASTER

SLAVE1

CLKIO

PHSEL

TPS53851

SLAVE2

CLKIO

PHSEL

TPS53851

10 kW

TPS53851

www.ti.com

SLUS985 – DECEMBER 2009

5.27.3.3 Three Devices 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.

APPLICATION INFORMATION

35

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