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TPS40140 Datasheet(PDF) 20 Page - Texas Instruments

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Part No. TPS40140
Description  Dual or 2-Phase, Stackable Controller
Download  68 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPS40140 Datasheet(HTML) 20 Page - Texas Instruments

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TPS40140
SLUS660I – SEPTEMBER 2005 – REVISED JANUARY 2015
www.ti.com
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 21. The configuration of the 2-phase master and a 2-phase slave controller is also
shown in Table 4 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 continue to
share load current with the master. This is not a preferred configuration and is mentioned here only for
completeness.
The 10-k
Ω resistor connected from the CLKIO line to GND is required to ensure that the CLKIO line falls to GND
quickly when the master device is shutdown or powers off. The master CLKIO pin goes to a high impedance
state at these times and if the CLKIO line was high, there is no other active discharge part. The slave controllers
look at the CLKIO line to determine if the system is supposed to be running or not. A level below 0.5 V on CLKIO
is required for this purpose.
NOTE
In any system configured to have a CLK master and CLK slaves, a 10-k
Ω resistor
connected from CLKIO to GND is required.
Table 4. TPS40140 Two-Device, 4-Phase Mode Selection and Pin Configuration
DEVICE PIN,
MASTER, 2-PHASE
DEVICE PIN,
SLAVE, 2-PHASE
MASTER
SLAVE
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
39-k
Ω TO GND
PHSEL
GND
PGOOD1
TO PULLUP RESISTOR
PGOOD1
TO PULL-UP RESISTOR
PGOOD1
TO PULLUP RESISTOR
PGOOD1
TO PULL-UP RESISTOR
CLKIO
TO SLAVE, CLKIO
CLKIO
TO MASTER, CLKIO
VSHARE
TO SLAVE, VSHARE
VSHARE
TO MASTER, VSHARE
BP5
TO SLAVE, BP5
BP5
TO MASTER, BP5
DESIGN HINT
TI recommends adding a 220-pF ceramic capacitor in parallel with the PHSEL resistor
string. This capacitor is connected from the PHSEL pin of the master control to GND.
20
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Copyright © 2005–2015, Texas Instruments Incorporated
Product Folder Links: TPS40140


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