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參數(shù)資料
| 型號： | TPS61170DRV |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 1.2A High Voltage Boost Converter in 2x2mm2 QFN Package |
| 中文描述： | 1.2A的高電壓升壓轉(zhuǎn)換器2x2mm2 QFN封裝 |
| 文件頁數(shù)： | 16/22頁 |
| 文件大?。?/td> | 405K |
| 代理商： | TPS61170DRV |
www.ti.com
SCHOTTKY DIODE SELECTION
The high switching frequency of the TPS61170 demands a high-speed rectification for optimum efficiency.
Ensure that the diode’s average and peak current rating exceeds the average output current and peak inductor
current. In addition, the diode’s reverse breakdown voltage must exceed the switch FET rating voltage of 40V.
So, the ONSemi MBR0540 is recommended for TPS61170. However, Schottky diode of low rating voltage can
be used for low output to save the solution size and cost. For example, 12V output with 20V diode is a good
choice.
COMPENSATION CAPACITOR SELECTION
The TPS61170 has an external compensation, COMP pin, which allows the loop response to be optimized for
each application. The COMP pin is the output of the internal error amplifier. An external resistor R3 and ceramic
capacitors C3 are connected to COMP pin to provide a pole and a zero. This pole and zero, along with the
inherent pole an zero in a current mode control boost converter, determine the close loop frequency response.
This is important to a converter stability and transient response.
P1
f
1
=
2 x 6 M
x C3
W
(7)
P2
f
2
=
2 x Rout x C2
p
(8)
2
RHPZ
f
Rout
=
x
2 x L
Vin
Vout
è
÷
(9)
Z
f
1
=
2 x R3 x C3
p
(10)
1.229
A =
Vout
Vin
1
2
x Gea x 6 M
x
x Rout x
Vout x Rsense
W
(11)
INPUT AND OUTPUT CAPACITOR SELECTION
The output capacitor is mainly selected to meet the requirements for the output ripple and loop stability. This
ripple voltage is related to the capacitor’s capacitance and its equivalent series resistance (ESR). Assuming a
capacitor with zero ESR, the minimum capacitance needed for a given ripple can be calculated using
Equation 12
.
C
out
V
out
V
in
I
out
Fs
V
out
V
ripple
(12)
V
ripple_ESR
I
out
R
ESR
TPS61170
SLVS789–NOVEMBER 2007
The following equations summarize the poles, zeros and DC gain in TPS61170, as shown in the block diagram.
They include the dominant pole (f
P1
), the output pole (f
P2
) of a boost converter, the right-half-plane zero (f
RHPZ
) of
a boost converter, the zero (f
Z
) generated by R3 and C3, and the DC gain (A).
where Rout is the load resistance, Gea is the error amplifier transconductance located in the ELECTRICAL
CHARACTERISTICS table, Rsense (100m
) is a sense resistor in the current control loop. These equations
helps generate a simple bode plot for TPS61170 loop analysis.
Increasing R3 or reducing C3 increases the close loop bandwidth which improves the transient response.
Adjusting R3 and C3 toward opposite direction increase the phase, and help loop stability. For most of the
applications, the recommended value of 10k and 680pF makes an ideal compromise between transient response
and loop stability. To optimize the compensation, use C3 in the range of 100pF to 10nF, and R3 of 10k. See the
TI application report for thorough analysis and description of the boost converter small signal model and
compensation design.
Where, V
ripple
= peak-to-peak output ripple. The additional output ripple component caused by ESR is calculated
using:
Due to its low ESR, Vripple_ESR can be neglected for ceramic capacitors, but must be considered if tantalum or
electrolytic capacitors are used.
16
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Copyright 2007, Texas Instruments Incorporated
Product Folder Link(s):
TPS61170
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS61170DRVR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1.2A Sw Hi Vltg Boost Conv RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(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 |
| TPS61170DRVRG4 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1.2A Sw Hi Vltg Boost Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(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 |
| TPS61170DRVT | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1.2A Sw Hi Vltg Boost Conv RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(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 |
| TPS61170DRVT | 制造商:Texas Instruments 功能描述:Voltage Regulators |
| TPS61170DRVTG4 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1.2A Sw Hi Vltg Boost Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(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 |
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