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| 型号： | TPS54140DGQR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封装： | GREEN, PLASTIC, MSOP-10 |
| 文件页数： | 28/46页 |
| 文件大小： | 1778K |
| 代理商： | TPS54140DGQR |
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Ioutmax
p mod =
2 ×
× Vout × Cout
p
(41)
1
z mod =
2
Resr × Cout
p
(42)
.
pmod
c max
out
F
2100
for ceramic capacitors
V
(43)
51442
.
c max
out
F
for Tantalum or Aluminum capacitors
V
(44)
.
c max
F
for all cases
5
sw
F
(45)
.
c min
pmod
F
5
F
for all cases
(46)
(
)
(
)
1
load
C
out
esr
mod
c
C
out
load
esr
6.6
R
2
F
C
R
G
=
2
F
C
R
+ R
p
+
é
ù
+
(47)
SLVS889 – OCTOBER 2008 .............................................................................................................................................................................................. www.ti.com
To compensate the TPS54140 using this method, first calculate the modulator pole and zero using the following
equations:
Where Ioutmax is the maximum output current, Cout is the output capacitance and Vout is the nominal output
voltage.
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 needs to select a crossover frequency which will determine the bandwidth of the control loop.
The cross over frequency must be located at a frequency at least five times higher than the modulator pole. The
cross over frequency must also be selected so that the available gain of the error amplifier at the cross over
frequency is high enough to allow for proper compensation.
Equation 47 is used to calculate the maximum cross over frequency when the ESR zero is located at a frequency
that is higher than the desired cross over 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 both Equation 43 and Equation 46.
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.
Once a cross over frequency, Fc, has been selected, the gain of the modulator at the cross over frequency is
calculated. The gain of the modulator at the cross over frequency is calculated using Equation 47 .
For the example problem, the gain of the modulator at the cross over frequency is 0.542. Next, the compensation
components are calculated. A resistor in series with a capacitor is used to create a compensating zero. A
capacitor in parallel to these two components forms the compensating pole. However, calculating the values of
these components varies depending on if the ESR zero is located above or below the cross over frequency. For
ceramic or low ESR tantalum output capacitors, the zero will usually be located above the cross over frequency.
For aluminum electrolytic and tantalum capacitors, the modulator zero is usually located lower in frequency than
the cross over frequency. For cases where the modulator zero is higher than the cross over frequency (ceramic
capacitors).
34
Copyright 2008, Texas Instruments Incorporated
Product Folder Link(s): TPS54140
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| TPS54140EVM-429 | 功能描述:电源管理IC开发工具 1.5A,25-42V In SWIFT Cnvrtr Eval Mod RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| TPS54140-Q1 | 制造商:TI 制造商全称:Texas Instruments 功能描述:1.5-A 42-V STEP-DOWN SWIFTa?￠ DC/DC CONVERTER WITH Eco-modea?￠ CONTROL |
| TPS54140QDGQRQ1 | 功能描述:直流/直流开关调节器 AC 3.5-42V Inp,1.5A RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| TPS54140QDRCRQ1 | 功能描述:直流/直流开关调节器 AC 3.5-42V Inp,1.5A RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| TPS54160 | 制造商:TI 制造商全称:Texas Instruments 功能描述:1.5-A, 60-V, STEP-DOWN SWIFT DC/DC CONVERTER WITH ECO-MODE |
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