參數(shù)資料
型號： TPS40131RHBR
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 1200 kHz SWITCHING FREQ-MAX, PQCC32
封裝： GREEN, PLASTIC, QFN-32
文件頁數(shù)： 5/40頁
文件大?。?/td> 940K
代理商： TPS40131RHBR
www.ti.com
Setting the Switching Frequency
R
T + 0.8
36
103
f
PH
* 9
(4)
fSW Phase Switching Frequency kHz
R
T
T
iming
Resistance
k
0
1000
200
400
600
800
50
100
150
200
250
300
350
400
450
500
EN/SYNC Function
Setting Overcurrent Protection
ILIM
PH(max)
CS
V
3.75
I
R
=
(5)
I
PH(max) +
I
OUT
2
)
V
IN * VOUT
V
OUT
2
L
OUT
f
SW
V
IN
(6)
SLVS635 – FEBRUARY 2007
The clock frequency is programmed by the value of the timing resistor connected from the RT pin to ground.
fPH is a single phase frequency, kHz. The RT resistor value is expressed in k. See Figure 3.
Figure 3. Phase Switching Frequency vs. Timing Resistance
The output ripple frequency is twice that of the single-phase frequency. The switching frequency of the controller
can be synchronized to an external clock applied to the EN/SYNC pin. The external clock synchronizes the
rising edge of HDRV and the falling edge of an external clock source. The switching frequency is one-eighth of
the external clock frequency.
Setting the overcurrent protection is given in the following equations. Care must be taken when calculating VILIM
to include the increase in RCS caused by the output current as it approaches the overcurrent trip point. The DCR
(RCS in the equation) of the inductor increases approximately 0.39% per degree Centigrade.
where
I
PH(max) is a maximum value of the phase current allowed
I
OUT is the total maximum DC output current
L
OUT is the output inductor value
f
SW is the switching frequency
V
OUT is the output voltage
V
IN is the input voltage
R
CS is a value of the current sense resistor used or the DCR value of the output inductor, LOUT
13
相關PDF資料
PDF描述
TPS40132RHBR 40 A SWITCHING CONTROLLER, 1200 kHz SWITCHING FREQ-MAX, PQCC32
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相關代理商/技術參數(shù)
參數(shù)描述
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TPS40131RHBTG4 功能描述:DC/DC 開關控制器 Two-Phase Synch Buck Cntrlr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK
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