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參數(shù)資料
| 型號： | ZXLD1100 |
| 文件頁數(shù)： | 10/15頁 |
| 文件大?。?/td> | 222K |
| 代理商： | ZXLD1100 |
Inductor selection
The choice of inductor will depend on available board
space as well as required performance. Small value
inductors have the advantage of smaller physical size
and may offer lower series resistance and higher
saturation current compared to larger values. A
disadvantageoflowerinductorvalues is thatthey result
in higher frequency switching, which in turn causes
reducedefficiency duetoswitchlosses.Higherinductor
values can provide better performance at lower supply
voltages. However, if the inductance is too high, the
output power will be limited by the internal oscillator,
which will prevent the coil current from reaching its
peakvalue.This conditionwillarisewhenevertheramp
time (I
x L/V
) exceeds the nominal 5 s
maximum ‘on’ time limit for the LX output.
Thegraphs oppositeshow theZXLD1100performance
forgiveninductorvalues anddifferentmanufacturers.
Recommended inductor values for the ZXLD1100 are
in the range 6.8 H to 22 H. The inductor should be
mounted as close to the device as possible with low
resistance connections to the LX and VIN pins.
Suitable coils for use with the ZXLD1100 are shown in
the table below:
Part No.
L
( H)
DCR
(
)
I
S AT
Manufacturer
CMD4D11-100MC 10
0.457 0.5
Sumida
www.sumida.com
DO1608-103
10
0.16
1.1
Coilcraft
www.coilcraft.com
LQH31CN100
10
1.3
0.23
Murata
www.murata.com
LB2012Y100MR
10
0.5
0.1
Taiyo Yuden
www.t-yuden.com
Diode selection
The rectifier diode (D1) should be a fast low
capacitance schottky diode with low reverse leakage at
the working voltage. It should also have a peak current
rating above the peak coil current and a continuous
current rating higher than the maximum output load
current.
The table below gives some typical characteristics for
diodes that can be used with the ZXLD1100:
Diode
V
F
@ 100mA (mV )
300
I
FS M
(mA)
1000
Ic (mA)
I
R
at 30V ( A)
15
Package
ZHCS400
400
SOD323
ZHCS500
300
1000
500
15
SOT23
Layout considerations
PCB tracks should be kept as short as possible to
minimize ground bounce, and the ground pin of the
device should be soldered directly to the ground plane.
It is particularly important to mount the coil and the
input/output capacitors close to the device to minimize
parasitic resistance and inductance, which will
degrade efficiency. The FB pin is a high impedance
inputso PCB tracklengths to this should also be keptas
short as possible to reduce noise pickup. Excess
capacitance from the FB pin to ground should be
avoided.
ZXLD1100
S E M IC O N D U C T O R S
ISSUE 2 - FEBRUARY 2004
10
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| ZXLD1100H6 | 制造商:Diodes Incorporated 功能描述:LED DRIVER ADJUSTABLE SMD SC-70-6 |
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| ZXLD1100H6TA | 功能描述:LED照明驅(qū)動器 Series/Parallel 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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| ZXLD1101 | 制造商:ZETEX 制造商全稱:ZETEX 功能描述:ADJUSTABLE LED DRIVER WITH INTERNAL SWITCH IN TSOT23-5 |
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