參數(shù)資料
型號(hào)： 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(yè)數(shù)： 17/22頁(yè)
文件大?。?/td> 405K
代理商： TPS61170DRV
www.ti.com
LAYOUT CONSIDERATIONS
As for all switching power supplies, especially those high frequency and high current ones, layout is an important
design step. If layout is not carefully done, the regulator could suffer from instability as well as noise problems.
To maximize efficiency, switch rise and fall times are made as short as possible. To prevent radiation of high
frequency resonance problems, proper layout of the high frequency switching path is essential. Minimize the
length and area of all traces connected to the SW pin and always use a ground plane under the switching
regulator to minimize interplane coupling. The high current path including the switch, Schottky diode, and output
capacitor, contains nanosecond rise and fall times and should be kept as short as possible. The input capacitor
needs not only to be close to the VIN pin, but also to the GND pin in order to reduce the IC supply ripple.
Figure 18
shows a sample layout
CTRL
GND
C3
L1
R2
Vin
CTRL
SW
FB
COMP
GND
C1
Vin
C2
Vout
Minimize the
area of this
trace
Place enough
VIAs around
thermal pad to
enhance thermal
performance
R3
R1
Note: minimize the trace
area at FB pin and
COMP pin
THERMAL CONSIDERATIONS
The maximum IC junction temperature should be restricted to 125
°
C under normal operating conditions. This
restriction limits the power dissipation of the TPS61170. Calculate the maximum allowable dissipation, P
D(max)
,
and keep the actual dissipation less than or equal to P
D(max)
. The maximum-power-dissipation limit is determined
using
Equation 13
:
TPS61170
SLVS789–NOVEMBER 2007
Care must be taken when evaluating a ceramic capacitor’s derating under dc bias, aging and AC signal. For
example, larger form factor capacitors (in 1206 size) have a resonant frequencies in the range of the switching
frequency. So, the effective capacitance is significantly lower. The DC bias can also significantly reduce
capacitance. Ceramic capacitors can loss as much as 50% of its capacitance at its rated voltage. Therefore,
choose a ceramic capacitor with a voltage rating at least 1.5X its expected dc bias voltage.
The capacitor in the range of 1
μ
F to 4.7
μ
F is recommended for input side. The output requires a capacitor in the
range of 1
μ
F to 10
μ
F. The output capacitor affects the loop stability of the boost regulator. If the output capacitor
is below the range, the boost regulator can potentially become unstable.
The popular vendors for high value ceramic capacitors are:
TDK (
http://www.component.tdk.com/components.php
)
Murata (
http://www.murata.com/cap/index.html
)
Figure 18. PCB Layout Recommendation
Copyright 2007, Texas Instruments Incorporated
Submit Documentation Feedback
17
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(kāi)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(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
TPS61170DRVRG4 功能描述:直流/直流開(kāi)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(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
TPS61170DRVT 功能描述:直流/直流開(kāi)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(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
TPS61170DRVT 制造商:Texas Instruments 功能描述:Voltage Regulators
TPS61170DRVTG4 功能描述:直流/直流開(kāi)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(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
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