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參數(shù)資料
| 型號(hào)： | L6920DTR |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 1V HIGH EFFICIENCY SYNCRONOUS STEP UP CONVERTER |
| 中文描述： | 1V的高效SYNCRONOUS升壓轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 9/13頁(yè) |
| 文件大?。?/td> | 183K |
| 代理商： | L6920DTR |
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L6920
Table 7. Capacitors distributors main list
5.3 Inductor selection
Usually, inductors ranging between 5
μ
H to 40
μ
H satisfy most of the applications.
Small value inductors have smaller physical size and guarantee a faster response to load transient but in steady
state condition a bigger ripple on output voltage is generated. In fact the output ripple voltage is given by Ipeak
multiplied by ESR. Furthermore, as shown in equation (1), inductor size affects also the maximum current de-
liverable to the load. Lastly, a low series resistance is suggested if very high efficiency values are needed. Any-
way, the saturation current of the choke should be higher than the peak current limit of the device (1A).
Good surface mounting inductors are available from COILCRAFTS, COILTRONICS, MURATA and other souc-
es. In the following table are listed some suggested components.
Table 8. Inductors distributors main list
5.4 Layout Guidelines
The board layout is very important in order to minimize noise, high frequency resonance problems and electro-
magnetic interference.
It is essential to keep as small as possible the high switching current circulating paths to reduce radiation and
resonance problems. So, the output and input cap should be very close to the device.
The external resistor dividers, if used, should be as close as possible to the pins of the device (FB and LBI) and
as far as possible from the high current circulating paths, to avoid pick up noise.
Large traces for high current paths and an extended groundplane, help to reduce the noise and increase the
efficiency.
For an example of recommended layout see the following evaluation board.
Manufacturer
Series
Cap Value (
μ
F)
Rated Voltage (V)
ESR (m
)
AVX
TPS
15 to 470
6.3
50 to 1500
KEMET
T510/T494/
T495
10 to 470
6
30 to 1000
PANASONIC
EEFCD
22 to 47
6.3
50 to 700
SANYO POSCAP
TPA/B/C
22 to 230
6.3
40 to 80
SPRAGUE
595D
100 to 390
6.3
160 to 700
Manufacturer
Series
Inductor Value (uH)
Saturation Current (A)
Coilcraft
DO1813HC
22 to 33
1 to 1.2
DO1608
4.7 to 15
0.9 to 1.5
Coiltronics
UP1B
22 to 33
1 to 1.2
TP3
4.7 to 15
0.97 to 1.6
BI
HM76-2
22 to 33
1 to 1.2
HM76-1
4.7 to 10
1 to 1.5
Murata
LQN6C
10 to 22
1.2 to 1.7
Panasonic
ELL6SH
10 to 22
0.9 to 1.5
ELL6RH
5.1 to10
11 to 1.55
Sumida
CR43
4.7 to 10
0.84 to 1.15
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| L6920D | 1V HIGH EFFICIENCY SYNCRONOUS STEP UP CONVERTER |
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| L6924D013TR | 功能描述:電池管理 Battery Charger Sys Li-Ion/Li-Poly RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| L6924U | 功能描述:電池管理 USB Battery Charger System w/integra RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
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