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參數(shù)資料
| 型號： | TPS61071DDC |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 90% EFFICIENT SYNCHRONOUS BOOST CONVERTER WITH 600-mA SWITCH |
| 中文描述： | 90％高效同步升壓轉換器和600毫安開關 |
| 文件頁數(shù)： | 15/21頁 |
| 文件大?。?/td> | 633K |
| 代理商： | TPS61071DDC |
www.ti.com
APPLICATION INFORMATION
DESIGN PROCEDURE
The TPS6107x dc/dc converters are intended for systems powered by a single-cell, up to triple-cell alkaline,
NiCd, NiMH battery with a typical terminal voltage between 0.9 V and 5.5 V. They can also be used in systems
powered by one-cell Li-ion or Li-polymer with a typical voltage between 2.5 V and 4.2 V. Additionally, any other
voltage source with a typical output voltage between 0.9 V and 5.5 V can power systems where the TPS6107x is
used. Due to the nature of boost converters, only the output voltage regulation is maintained when the input
voltage applied is lower than the programmed output voltage.
Programming the Output Voltage
R1
R2
VO
VFB
1
180 k
VO
500 mV
1
(1)
CparR1
3 pF
200 k
R2
1
(2)
SW
C1
Power
Supply
L1
VBAT
VOUT
FB
C2
EN
GND
TPS61070
V
CC
Boost Output
R1
R2
Inductor Selection
A boost converter normally requires two main passive components for storing energy during the conversion. A
boost inductor and a storage capacitor at the output are required. To select the boost inductor, it is
recommended to keep the possible peak inductor current below the current limit threshold of the power switch in
the chosen configuration. For example, the current limit threshold of the TPS6107x's switch is 600 mA. The
highest peak current through the inductor and the switch depends on the output load, the input (VBAT), and the
output voltage (VOUT). Estimation of the maximum average inductor current is done using Equation 3:
IL
IO
VOUT
VBAT
0.8
(3)
TPS61070
TPS61071
SLVS510–JUNE 2004
The output voltage of the TPS61070 dc/dc converter can be adjusted with an external resistor divider. The typical
value of the voltage at the FB pin is 500 mV. The maximum recommended value for the output voltage is 5.5 V.
The current through the resistive divider should be about 100 times greater than the current into the FB pin. The
typical current into the FB pin is 0.01 μA, and the voltage across R2 is typically 500 mV. Based on those two
values, the recommended value for R2 should be lower than 500 k
, in order to set the divider current at 1 μA or
higher. Because of internal compensation circuitry, the value for this resistor should be in the range of 200 k
.
From that, the value of resistor R1, depending on the needed output voltage (V
O
), can be calculated using
Equation 1:
For example, if an output voltage of 3.3 V is needed, a 1-M
resistor should be chosen for R1. If for any reason
the value chosen for R2 is significantly lower than 200 k
, additional capacitance in parallel to R1 is
recommended, because the device can show unstable regulation of the output voltage. The required capacitance
value can be calculated using Equation 2:
Figure 22. Typical Application Circuit for Adjustable Output Voltage Option
For example, for an output current of 75 mA at 3.3 V, at least 340 mA of average current flows through the
inductor at a minimum input voltage of 0.9 V.
15
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相關代理商/技術參數(shù) |
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|---|---|
| TPS61071DDCR | 功能描述:直流/直流開關調節(jié)器 Adj 600-mA Switch PWM Boost 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(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS61071DDCR | 制造商:Texas Instruments 功能描述:DC/DC CONVERTER IC 制造商:Texas Instruments 功能描述:IC, SYNC BOOST CONVERTER, SOT-6 |
| TPS61071DDCRG4 | 功能描述:直流/直流開關調節(jié)器 Adj 600-mA Switch PWM Boost 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(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS61071-Q1 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:90% EFFICIENT SYNCHRONOUS BOOST CONVERTER WITH 600-mA SWITCH |
| TPS61071TDDCRQ1 | 功能描述:直流/直流開關轉換器 AC Adj,600mA Sw,90% Eff PWM Boost Cnvrtr RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
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