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參數(shù)資料
| 型號： | 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)： | 15/66頁 |
| 文件大?。?/td> | 1264K |
| 代理商： | TPS53851RHHT |
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R+1.33
39.2
10
3
*1.041
PH
*7 ;
0
50
100
150
200
250
300
350
400
450
100
200
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900 1000
Phase Switching Frequency kHz
Rt
T
iming
Resistor
k
W
PHASE FREQUENCY
vs
TIMING RESISTOR
SLUS985 – DECEMBER 2009
www.ti.com
5.20 SETTING THE SWITCHING FREQUENCY
The clock frequency is programmed by the value of the timing resistor connected from the RT pin to
ground. See Equation 5. This equation gives the frequency for an 8-phase system. For a 6-phase system
the frequency is 1 1/3 times higher.
(5)
Figure 5-6. Phase Switching Frequency vs RT
5.21 SYNCHRONIZING A SINGLE CONTROLLER TO AN EXTERNAL CLOCK
The TPS53851 has the ability to synchronize a single controller to an external clock. The clock must be a
pulse stream at 6 or 8 times the master PWM frequency. See Figure 5-7.
Synchronizing the single controller to an external clock is similar to synchronizing a clock slave to a clock
master. The single controller is put in clock slave mode by connecting the RT pin to BP5, disabling the
internal clock generator. If the external CLKIO signal is a clock stream without any missing pulses, the
master synchromizes to an arbitrary pulse so there is no determinant phase synchronization. Without a
missing pulse, the PWM frequency is 1/8 of the external clock. If the external CLKIO signal has a missing
pulse every 6 cycles or 8 cycles, the controller synchronizes based on the missing pulse which would be
in the 6th or 8th position. With the missing pulse, the phase synchronization of the master, to the missing
pulse, can be controlled by the voltage on the PHSEL pin. See the section on DIGITAL CLOCK
SYNCHRONIZATION. Phase shifting would also be desirable if more than one controller were to be
synchronized to the same external clock.
22
APPLICATION INFORMATION
Copyright 2009, Texas Instruments Incorporated
Product Folder Link(s): TPS53851
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