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參數資料
| 型號： | TPS61081DRCTG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | 1.3 A SWITCHING REGULATOR, 1500 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | 3 X 3 MM, 1 MM HEIGHT, GREEN, PLASTIC, QFN-10 |
| 文件頁數： | 8/25頁 |
| 文件大小： | 925K |
| 代理商： | TPS61081DRCTG4 |
www.ti.com
LAYOUT CONSIDERATION
FSW
Vout
EN
GND
T
h
e
r
m
a
l
P
a
d
Cs
C1
R1
R2
C3*
C2
L1
Vin
R3*
PGND
SLVS644B – FEBRUARY 2006 – REVISED JANUARY 2007
During a load transient, the output capacitor at the output of the boost converter has to supply or absorb
transient current before the inductor current ramps up its steady state value. Larger capacitors always help to
reduce the voltage over and under shoot during a load transient. A larger capacitor also helps loop stability.
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 their self 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,
almost leave margin on voltage rating to ensure adequate capacitance.
The popular vendors for high value ceramic capacitors are:
As for all switching power supplies, the layout is an important step in the design, especially for high current and
high switching frequencies. If layout is not carefully done, the regulator could show stability problems as well as
EMI problems. Therefore, use wide and short traces for high current paths and for power ground tracks. Input
capacitor needs not only close to the VIN, but also to the GND pin to reduce the voltage ripple seen by the IC.
The L and SW pin are conveniently located on the edge of the IC, therefore inductor can be placed close to the
IC. The output capacitor needs to be placed near the load to minimize ripple and maximize transient
performance.
To minimize the effects of ground noise, use a common node for all power ground that is connected to the
PGND pin, and a different one for signal ground tying to the GND pin. Connect two ground nodes together at the
load if possible. This allows the GND pin to be close to the output ground for good DC regulation. Any voltage
difference between these two nodes would be gained up by feedback divider on the output. It is also beneficial
to have the ground of the output capacitor close to PGND since there is a large current between them. To lay
out signal ground, it is recommended to use short traces separated from power ground traces.
16
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相關代理商/技術參數 |
參數描述 |
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| TPS61081EVM-147 | 功能描述:電源管理IC開發工具 TPS61081-147 Eval Mod RoHS:否 制造商:Maxim Integrated 產品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| TPS61085 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:650 kHz/1.2 MHz, 18.5 V STEP-UP DC-DC CONVERTER |
| TPS61085DGK | 制造商:TI 制造商全稱:Texas Instruments 功能描述:650 kHz/1.2 MHz, 18.5 V STEP-UP DC-DC CONVERTER |
| TPS61085DGKR | 功能描述:直流/直流開關調節器 650kHz 1.2MHz Step- Up DC-DC Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS61085DGKRG4 | 功能描述:直流/直流開關調節器 650kHz 1.2MHz Step- Up DC-DC Cnvrtr RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
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