參數(shù)資料
型號(hào)： TPS6107X
廠(chǎng)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(zhuǎn)換器和600毫安開(kāi)關(guān)
文件頁(yè)數(shù)： 14/21頁(yè)
文件大?。?/td> 400K
代理商： TPS6107X
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, the output voltage regulation is only 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 (V
BAT
), and the
output voltage (V
OUT
). Estimation of the maximum average inductor current can be done using
Equation 3
:
IL
IO
VOUT
VBAT
0.8
(3)
TPS61070, TPS61071
TPS61072, TPS61073
SLVS510A–JULY 2006–REVISED JANUARY 2007
The output voltage of the TPS6107x 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
:
If as an example, if an output voltage of 3.3 V is needed, a 1.0 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, in case the device shows instable regulation of the output voltage. The required capacitance
value can be calculated using
Equation 2
:
Figure 23. 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.
14
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TPS61080DRCT 功能描述:LED照明驅(qū)動(dòng)器 High Vge DC/DC Boost Converter RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N
TPS61080DRCTG4 功能描述:LED照明驅(qū)動(dòng)器 27V 500mA SW 1.2MHz Boost Cnvrtr RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N
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