參數(shù)資料
型號(hào)： TPS54160DGQR
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 穩(wěn)壓器
英文描述： 2.7 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10
封裝： GREEN, PLASTIC, MSOP-10
文件頁(yè)數(shù)： 28/50頁(yè)
文件大?。?/td> 1375K
代理商： TPS54160DGQR
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>
p
OUT max
P mod
OUT
I
f
2
V
C
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p
Z mod
ESR
OUT
1
f
2
R
C
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P mod
C max
OUT
f
2100
V
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C max
OUT
51442
f
V
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SW
C max
f
5
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(
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C min
P mod
f
5
f
( )
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p
+
=
p
+
LOAD
C
OUT
ESR
PS
MOD fc
C
OUT
LOAD
ESR
gm
R
2
f
C
R
1
G
2
f
C
R
1
SLVS795C – OCTOBER 2008 – REVISED OCTOBER 2010
www.ti.com
To compensate the TPS54160 using this method, first calculate the modulator pole and zero using the following
equations:
where
IOUT(max) is the maximum output current
COUT is the output capacitance
VOUT is the nominal output voltage
(41)
(42)
For the example design, the modulator pole is located at 1.5 kHz and the ESR zero is located at 338 kHz.
Next, the designer selects a crossover frequency which will determine the bandwidth of the control loop. The
crossover frequency must be located at a frequency at least five times higher than the modulator pole. The
crossover frequency must also be selected so that the available gain of the error amplifier at the crossover
frequency is high enough to allow for proper compensation.
Equation 47 is used to calculate the maximum crossover frequency when the ESR zero is located at a frequency
that is higher than the desired crossover frequency. This will usually be the case for ceramic or low ESR
tantalum capacitors. Aluminum Electrolytic and Tantalum capacitors will typically produce a modulator zero at a
low frequency due to their high ESR.
The example application is using a low ESR ceramic capacitor with 10m
of ESR making the zero at 338 kHz.
This value is much higher than typical crossover frequencies so the maximum crossover frequency is calculated
Using Equation 46 gives a minimum crossover frequency of 7.6 kHz and Equation 43 gives a maximum
crossover frequency of 45.3 kHz.
A crossover frequency of 45 kHz is arbitrarily selected from this range.
For ceramic capacitors use Equation 43:
(43)
For tantalum or aluminum capacitors use Equation 44:
(44)
For all cases use Equation 45 and Equation 46:
(45)
(46)
Once a crossover frequency, fC, has been selected, the gain of the modulator at the crossover frequency is
calculated. The gain of the modulator at the crossover frequency is calculated using Equation 47 .
(47)
34
Copyright 2008–2010, Texas Instruments Incorporated
Product Folder Link(s): TPS54160
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TPS54160DGQRG4 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 3.5-60V,1.5A Step Down SWIFT Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
TPS54160DRCR 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:1.5-A, 60-V, STEP-DOWN SWIFT DC/DC CONVERTER WITH ECO-MODE
TPS54160DRCT 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:1.5-A, 60-V, STEP-DOWN SWIFT DC/DC CONVERTER WITH ECO-MODE
TPS54160EVM-230 功能描述:電源管理IC開(kāi)發(fā)工具 TPS54160 Eval Mod RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類(lèi)型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V
TPS54160EVM-535 功能描述:電源管理IC開(kāi)發(fā)工具 Eval Mod for High Brightness LED Drvr RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類(lèi)型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V
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