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TPS40140 Datasheet(PDF) 33 Page - Texas Instruments

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Part No. TPS40140
Description  DUAL OR 2-PHASE, STACKABLE CONTROLLER
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TPS40140 Datasheet(HTML) 33 Page - Texas Instruments

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5.27.3 CLOCK MASTER, PHSEL AND CLKIO CONFIGURATIONS
CLKIO
PHSEL
TPS40140
MASTER
20
µA
TPS40140
DUAL OR 2-PHASE, STACKABLE CONTROLLER
SLUS660A – SEPTEMBER 2005 – REVISED JULY 2006
In this configuration, the Master senses that there is one Slave controller, by the 39-k
Ω resistor on the
PHSRL pin, and distributes the CLKIO signal. The Slave controller senses the zero-volt level on its
PHSEL pin and delays the proper number of CLKIO pulses to be 90
° out of phase with the Master.
Two ICs could also be configured as a 2 Phase, single output Master and a Slave which has two
independent outputs, but is synchronized with the Master controller clock. The configuration is shown in
Table 5-4.
Table 5-4. TPS40140 TWO DEVICE, 2 PHASE MASTER AND A DUAL OUTPUT SLAVE CONFIGURATION
DEVICE PIN, MASTER
MASTER, 2 PHASE
DEVICE PIN, SLAVE
SLAVE, DUAL OUTPUT
COMP1
TO NETWORK
COMP1
TO NETWORK
COMP2
COMP1
COMP2
TO NETWORK
TRK1
TO SS CAPACITOR
TRK1
TO SS CAPACITOR
TRK2
TO BP5
TRK2
TO SS CAPACITOR
ILIM1
TO SET RESISTORS
ILIM1
TO SET RESISTORS
ILIM2
GND
ILIM2
TO SET RESISTORS
FB1
TO NETWORK
FB1
TO NETWORK
FB2
GND
FB2
TO NETWORK
PHSEL
39-k
Ω TO GND
PHSEL
GND
PGOOD1
TO PULL-UP RESISTOR
PGOOD1
TO PULL-UP RESISTOR
PGOOD1
TO PULL-UP RESISTOR
PGOOD1
TO PULL-UP RESISTOR
CLKIO
TO SLAVE, CLKIO
CLKIO
TO MASTER, CLKIO
The clock synchronization between the Master and the Slave controller(s) is implemented in a simple
configuration of series 39-k
Ω resistors. There is a 20-µA current source from the PHSEL pin of the Master
controller. Depending on the number of Slave controllers connected, the Slave controllers will select the
proper delay from the Master CLKIO signal to accomplish phase interleaving. On a given Master or Slave
controller, the two phases are always 180
° out of phase.
The CLKIO signal has either six or eight clocks for each cycle of the switching period.
For maximum flexibility the Master and Slave controllers can be either in a 2 Phase configuration or a
Dual output configuration
5.27.3.1 One device Operation
The basic configuration of a single device is shown in Figure 5-14.
Figure 5-14. Single Controller only, Two Phases
Submit Documentation Feedback
APPLICATION INFORMATION
33


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