參數(shù)資料
型號(hào): TPS53851RHHT
廠商: TEXAS INSTRUMENTS INC
元件分類: 穩(wěn)壓器
英文描述: SWITCHING CONTROLLER, PQCC36
封裝: PLASTIC, VQFN-36
文件頁數(shù): 27/66頁
文件大?。?/td> 1264K
代理商: TPS53851RHHT
www.ti.com
SLUS985 – DECEMBER 2009
In this configuration, the master senses that there is one slave controller, by the 39-k
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 devices 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. TPS53851 Two-Device, Two-Phase Master and a Dual-Output Slave
Configuration
DEVICE PIN,
MASTER, 2 PHASE
SLAVE, DUAL OUTPUT
MASTER
SLAVE
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
to GND
PHSEL
GND
PGOOD1
to pull-up resistor
PGOOD1
to pull-up resistor
PGOOD2
to pull-up resistor
PGOOD2
to pull-up resistor
CLKIO
to slave, CLKIO
CLKIO
to slave, CLKIO
5.27.3 CLOCK MASTER, PHSEL AND CLKIO CONFIGURATIONS
The clock synchronization between the master and the slave controller(s) is implemented in a simple
configuration of series 39-k
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 selects 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
Copyright 2009, Texas Instruments Incorporated
APPLICATION INFORMATION
33
Product Folder Link(s): TPS53851
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