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參數(shù)資料
| 型號(hào)： | TPS617 |
| 英文描述： | PHOTOTRANSISTOR | NPN | LED-7C |
| 中文描述： | 光電晶體管|叩|發(fā)光二極管- 7C條 |
| 文件頁數(shù)： | 16/22頁 |
| 文件大?。?/td> | 392K |
| 代理商： | TPS617 |
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)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TPS618 | PHOTOTRANSISTOR | NPN | 870NM PEAK WAVELENGTH | 50M | LED-7C |
| TPS61000DGSR | SMPS Controller |
| TPS61001DGSR | SMPS Controller |
| TPS61002DGSR | SMPS Controller |
| TPS61003DGSR | SMPS Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS617-B | 制造商:Toshiba America Electronic Components 功能描述: |
| TPS618 | 制造商:TOSHIBA 制造商全稱:Toshiba Semiconductor 功能描述:PHOTO TRANSISTOR FOR PHOTO INTERRUPTER |
| TPS62000DGS | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 Adj 600mA Hi-Eff Step-Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)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(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS62000DGS | 制造商:Texas Instruments 功能描述:BUCK CONVERTER ADJ O/P SMD 62000 |
| TPS62000DGS | 制造商:Texas Instruments 功能描述:HIGH EFFICIENCY STEP-DOWN CONVERTER :ROH |
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