參數(shù)資料
型號： TPS61050YZG
廠商： Texas Instruments, Inc.
英文描述： 1.2-A HIGH POWER WHITE LED DRIVER 2-MHz SYNCHRONOUS BOOST CONVERTER WITH I2C COMPATIBLE INTERFACE
中文描述： 1.2 A的高功率白光LED I2C兼容接口的驅動2 - MHz的同步升壓轉換器
文件頁數(shù)： 30/45頁
文件大?。?/td> 1033K
代理商： TPS61050YZG
www.ti.com
APPLICATION INFORMATION
INDUCTOR SELECTON
A boost converter requires two main passive components for storing energy during the conversion. A boost
inductor and a storage capacitor at the output are required. The TPS6105x device integrates a current limit
protection circuitry. The peak current of the NMOS switch is sensed to limit the maximum current flowing through
the switch and the inductor. The typical peak current limit (1000 mA / 1500 mA / 2000 mA) is user selectable via
the I
2
C interface.
I
L
I
OUT
V
OUT
V
IN
D
(1)
I
L(PEAK)
V
IN
2
f
L
I
OUT
D)
(1
with D
V
OUT
V
IN
V
OUT
(2)
TPS61050
TPS61052
SLUS525–MARCH 2007
In order to optimize solution size the TPS6105x device has been designed to operate with inductance values
between a minimum of 1.3
μ
H and maximum of 2.9
μ
H. In typical high-current white LED applications a 2.2
μ
H
inductance is recommended.
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. The highest peak current through the inductor
and the power switch depends on the output load, the input and output voltages. Estimation of the maximum
average inductor current and the maximum inductor peak current can be done using
Equation 1
and
Equation 2
:
with:
f = switching frequency (2 MHz)
L = inductance value (2.2
μ
H)
η
= estimated efficiency (85%)
For example, for an output current of 500 mA at 5 V, the TPS6105x device needs to be set for a 1000 mA
current limit operation together with an inductor supporting this peak current.
The losses in the inductor caused by magnetic hysteresis losses and copper losses are a major parameter for
total circuit efficiency.
Table 3. List of Inductors
MANUFACTURER
TDK
TAIYO YUDEN
TDK
COILCRAFT
MURATA
TOKO
SERIES
VLF3010AT
NR3010
VLF3014AT
LPS3015
LQH3NP
FDSE0312
DIMENSIONS
ILIM SETTINGS
2,6 mm
×
2,8 mm
×
1,0 mm max. height
3,0 mm
×
3,0 mm
×
1,0 mm max. height
2,6 mm
×
2,8 mm
×
1,4 mm max. height
3,0 mm
×
3,0 mm
×
1,5 mm max. height
3,0 mm
×
3,0 mm
×
1,5 mm max. height
3,0 mm
×
3,0 mm
×
1,2 mm max. height
1000 mA (typ.)
1500 mA (typ.)
2000 mA (typ.)
30
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TPS61050YZGR 功能描述:LED照明驅動器 1.2A High Pwr White 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: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N
TPS61050YZGT 功能描述:LED照明驅動器 1.2A High Pwr White 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: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N
TPS61052 制造商:TI 制造商全稱:Texas Instruments 功能描述:1.2-A HIGH POWER WHITE LED DRIVER 2-MHz SYNCHRONOUS BOOST CONVERTER WITH I2C COMPATIBLE INTERFACE
TPS61052DRC 制造商:TI 制造商全稱:Texas Instruments 功能描述:1.2-A HIGH POWER WHITE LED DRIVER 2-MHz SYNCHRONOUS BOOST CONVERTER WITH I2C COMPATIBLE INTERFACE
TPS61052DRCR 功能描述:LED照明驅動器 Synch Boost Conv. w/ I2C for Pwr LEDs 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: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N
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