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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 |
| 文件頁數(shù)： | 14/22頁 |
| 文件大?。?/td> | 405K |
| 代理商： | TPS61170DRV |
www.ti.com
APPLICATION INFORMATION
PROGRAM OUTPUT VOLTAGE
FB
TPS61170
R2
R1
VOUT
R1
Vout
Vout = 1.229 V x
+ 1
R1 = R2 x
1
R2
1.229 V
-
è
÷
è
÷
(2)
MAXIMUM OUTPUT CURRENT
The overcurrent limit in a boost converter limits the maximum input current, and thus the maximum input power
for a given input voltage. The maximum output power is less than the maximum input power due to power
conversion losses. Therefore, the current-limit setting, input voltage, output voltage and efficiency can all affect
the maximum output current. The current limit clamps the peak inductor current; therefore, the ripple must be
subtracted to derive the maximum DC current. The ripple current is a function of the switching frequency,
inductor value and duty cycle. The following equations take into account of all the above factors for maximum
output current calculation.
ú
ù
ê
é
+
-
+
′
′
=
)
V
1
V
V
V
1
(
F
L
1
I
in
in
f
out
s
P
(3)
out
P
lim
in
max
_
out
V
)
2
I
I
V
I
h
′
-
′
=
(4)
TPS61170
SLVS789–NOVEMBER 2007
Figure 17. Program Output Voltage
To program the output voltage, select the values of R1 and R2 (See
Figure 17
) according to
Equation 2
.
Considering the leakage current through the resistor divider and noise decoupling to FB pin, an optimum value
for R2 is around 10k. The output voltage tolerance depends on the VFB accuracy and the tolerance of R1 and
R2.
where:
I
P
= inductor peak to peak ripple
L = inductor value
V
f
= Schottky diode forward voltage
F
s
= switching frequency
V
out
= output voltage
where:
I
out_max
= Maximum output current of the boost converter
I
lim
= overcurrent limit
η
= efficiency
For instance, when V
in
is 5 V, V
out
is 12 V, the inductor is 10
μ
H, the Schottky forward voltage is 0.2 V; and then
the maximum output current is 300 mA in typical operation.
14
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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) |
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|---|---|
| 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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