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TPS40140RHHT Datasheet(PDF) 20 Page - Texas Instruments |
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TPS40140RHHT Datasheet(HTML) 20 Page - Texas Instruments |
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20 / 68 page  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 Submit Documentation Feedback Copyright © 2005–2015, Texas Instruments Incorporated Product Folder Links: TPS40140 |
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