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TPS40140 Datasheet(PDF) 31 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) 31 Page - Texas Instruments

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5.27.2 MULTIPLE ICs
TPS40140
DUAL OR 2-PHASE, STACKABLE CONTROLLER
SLUS660A – SEPTEMBER 2005 – REVISED JULY 2006
In a multiple device system it is often desireable to synchronize the clocks of all the ICs to minimize input
ripple current as well as radiated and conducted emissions. This is accomplished by designating one of
the controllers as the 'Master' and the other ICs as 'Slaves'. The Master generates the system clock,
CLKIO , and it is distributed to the Slaves. This is the most useful configuration of multiple ICs and the one
that is demonstrated in this data sheet. It is described in more detail in the ' Clock Master, PHSEL AND
CLKIO Configurations' section.
To increase the total current capability, or number of outputs, a single Slave controller can be added to a
Master controller as shown in Figure 5-15. The configuration of the 2 Phase Master and a 2 Phase Slave
controller is also shown in Table 5-3 It is possible to have the Master controller operate on one switching
frequency and the Slave controllers on another, independent frequency. In a multi-phase system the Slave
controllers would still share load current with the Master. This is not a preferred configuration and is
mentioned here only for completeness.
Table 5-3. TPS40140 TWO DEVICE, 4 PHASE MODE SELECTION AND PIN CONFIGURATION
DEVICE PIN, MASTER
MASTER, 2 PHASE
DEVICE PIN, SLAVE
SLAVE, 2 PHASE
COMP1
TO NETWORK
COMP1
TO MASTER, COMP1
COMP2
COMP1
COMP2
TO MASTER, COMP1
TRK1
TO SS CAPACITOR
TRK1
TO BP5
TRK2
TO BP5
TRK2
TO BP5
ILIM1
TO SET RESISTORS
ILIM1
GND
ILIM2
GND
ILIM2
GND
FB1
TO NETWORK
FB1
GND
FB2
GND
FB2
GND
PHSEL
39K
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
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APPLICATION INFORMATION
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