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參數(shù)資料
| 型號： | TPS615 |
| 英文描述： | PHOTOTRANSISTOR | NPN | 800NM PEAK WAVELENGTH | 20M | LED-2B |
| 中文描述： | 光電晶體管|叩| 800NM峰值波長| 2000萬|發(fā)光二極管- 2B衛(wèi)星 |
| 文件頁數(shù)： | 16/22頁 |
| 文件大?。?/td> | 392K |
| 代理商： | TPS615 |
TPS61000, TPS61001, TPS61002, TPS61003, TPS61004, TPS61005, TPS61006, TPS61007
SINGLE-AND DUAL-CELL BOOST CONVERTER WITH START-UP INTO FULL LOAD
SLVS279B – MARCH 2000 – REVISED AUGUST 2000
16
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
With those parameters it is possible to calculate the value for the inductor:
L
VBATx VOUT– VBAT
ILx f x VOUT
(4)
Parameter f is the switching frequency and
I
L
is the ripple current in the inductor, i.e., 20% x I
L
.
In this example, the desired inductor will have the value of 12
μ
H. With this calculated value and the calculated
currents, it is possible to chose a suitable inductor. Care has to be taken that load transients and losses in the
circuit can lead to higher currents as estimated in equation 3. Also, the losses in the inductor caused by magnetic
hysteresis losses and copper losses are a major parameter for total circuit efficiency.
The following inductors from different suppliers were tested. All will work with the TPS6100x converter within
their specified parameters:
Table 1. Recommended Inductors
VENDOR
Coilcraft
PART NUMBER
DO1608P Series
DS1608P Series
DO3308 Series
Coiltronics
UP1B Series
UP2B Series
Murata
LQH3N Series
Sumida
CD43 Series
CD54 Series
CDR74B Series
TDK
NLC453232T Series
capacitor selection
The major parameter necessary to define the output capacitor is the maximum allowed output voltage ripple of
the converter. This ripple is determined by two parameters of the capacitor, the capacitance and the ESR. It is
possible to calculate the minimum capacitance needed for the defined ripple, supposing that the ESR is zero.
Cmin
IOUTx VOUT– VBAT
f x
V x VOUT
(5)
Parameter f is the switching frequency and
V is the maximum allowed ripple.
With a chosen ripple voltage of 15 mV, a minimum capacitance of 10
μ
F is needed. The total ripple will be larger
due to the ESR of the output capacitor. This additional component of the ripple can be calculated using the fol-
lowing equation:
VESR
IOUTx RESR
(6)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS615(F) | 制造商:Toshiba America Electronic Components 功能描述: 制造商:Toshiba America Electronic Components 功能描述:Phototransistor Chip Silicon NPN Transistor 800nm 2-Pin T-1 |
| TPS615_07 | 制造商:TOSHIBA 制造商全稱:Toshiba Semiconductor 功能描述:Silicon NPN Epitaxial Planar |
| TPS61500 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:3A Boost Converter for High Brightness LED Driver with Multiple Dimming Methods |
| TPS61500EVM-369 | 功能描述:LED 照明開發(fā)工具 TPS61500EVM-369 Eval Mod RoHS:否 制造商:Fairchild Semiconductor 產(chǎn)品:Evaluation Kits 用于:FL7732 核心: 電源電壓:120V 系列: 封裝: |
| TPS61500PWP | 功能描述:LED照明驅(qū)動器 High Brightness 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 |
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