參數(shù)資料
型號(hào)： TPS61058DRC
廠商： Texas Instruments, Inc.
英文描述： SYNCHRONOUS BOOST CONVERTER WITH DOWN MODE HIGH POWER WHITE LED DRIVER
中文描述： 同步升壓轉(zhuǎn)換器斷電模式高功率白光LED驅(qū)動(dòng)
文件頁(yè)數(shù)： 16/30頁(yè)
文件大小： 1684K
代理商： TPS61058DRC
www.ti.com
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 TPS61059 switch is 1700 mA at an
output voltage of 5 V. The highest peak current through the inductor and the switch depends on the output load,
the input voltage and the output voltage. Estimation of the maximum average inductor current can be done using
Equation 14
:
IL
IOUT
VOUT
VIN
0.8
(14)
VOUT
VF(LED)
RS
ILED
(15)
L
VIN
VOUT
VIN
IL
VOUT
(16)
TPS61058
TPS61059
SLVS572B–APRIL 2005–REVISED DECEMBER 2005
For example, for an output current of 500 mA at 4.5 V, at least 800 mA of average current flows through the
inductor at a minimum input voltage of 3.3 V.
The second parameter for choosing the inductor is the desired current ripple in the inductor. In order to optimized
the solution size, inductor ripple currents as high as 40% of the average inductor current can be tolerated. A
smaller ripple reduces the magnetic hysteresis losses in the inductor, as well as output voltage ripple and EMI.
With those parameters, it is possible to calculate the value for the inductor by using
Equation 16
:
Parameter
f
is the switching frequency and
I
L
is the ripple current in the inductor, i.e., 40%
×
I
L
. In this example,
the desired inductor has the value of 4.5 μH. With this calculated value and the calculated currents, it is possible
to choose a suitable inductor. In typical high current white LED applications a 4.7 μH inductance is
recommended. Care has to be taken that load transients and losses in the circuit can lead to higher currents as
estimated in
Equation 16
. Also, the losses in the inductor caused by magnetic hysteresis losses and copper
losses are a major parameter for total circuit efficiency.
The following inductor series from different suppliers have been used with the TPS61058/9 converters:
Table 1. List of Inductors
MANUFACTURER
COILCRAFT
SERIES
LPS3015
VLF3014AT
VLF5014AT
NP04SZB
DIMENSIONS
REMARKS
TPS61058
TPS61058
TPS61059
TPS61059
3 mm x 3 mm x 1.5 mm max. height
2.6 mm x 2.8 mm x 1.4 mm max. height
4.5 mm x 4.7 mm x 1.4 mm max. height
5 mm x 5 mm x 2.0 mm max. height
TDK
TAIYO YUDEN
16
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPS61058DRCR 功能描述:LED照明驅(qū)動(dòng)器 Hi-Power Single Cell White LED Driver 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
TPS61058DRCR 制造商:Texas Instruments 功能描述:IC LED DRIVER PHOTO FLASH 10-SON
TPS61058DRCRG4 功能描述:LED照明驅(qū)動(dòng)器 Hi-Power Single Cell White LED Driver 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
TPS61059 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:SYNCHRONOUS BOOST CONVERTER WITH DOWN MODE HIGH POWER WHITE LED DRIVER
TPS61059DRC 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:SYNCHRONOUS BOOST CONVERTER WITH DOWN MODE HIGH POWER WHITE LED DRIVER
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