參數(shù)資料
型號(hào)： IRS2540
廠商： International Rectifier
英文描述： IRPLLED1 High Voltage LED Driver using the IRS2540
中文描述： IRPLLED1高電壓LED驅(qū)動(dòng)器采用IRS2540
文件頁(yè)數(shù)： 15/28頁(yè)
文件大?。?/td> 839K
代理商： IRS2540
15
RD-0608
www.irf.com
applications an alternate V
CC
supply scheme utilizing a resistor feed-back (R
S2
) from the output needs
to be implemented, as seen in Figs. 1 & 16.
The resistance between V
BUS
and V
CC
(R
S1
) should be large enough to minimize the current sourced
directly from the input voltage line; value should be on the order of several kilo ohms. Through this
supply resistor a current will flow to charge the V
CC
capacitor. Once the capacitor is charged up to the
V
CCUV+
threshold, the IRS254(0,1) begins to operate, activating the LO and HO outputs. After the first
few cycles of switching, the resistor R
S2
connected between the output and V
CC
will take over and
source current for the IC. The R
S2
resistor provided in the evaluation board has been designed for an
output of roughly 20 V. If a higher output voltage is desired, R
S2
will need to be redesigned and
adjusted accordingly.
A 10 μF capacitor has been used for stabilizing V
CC
of the chip. Such a large capacitance makes the
chip immune to any large low frequency ripple that may be observed on V
BUS
due to a rectified
waveform. There are also other benefits associated with using such a large capacitance, of which will
be discussed later.
With having all input and output voltages defined for the evaluation board, enough information is
provided to calculate values for R
S1
, R
S2
, and R
S3
(see Fig. 23 for component definition). All three
supply resistors were chosen to be 1 W devices since they source all current to the chip. By making
each component 1 W, the work in supplying the chip can be split up equally, making it a more robust
solution, instead of baring the entire task on one component. Doing this also allows the chip to turn on
at a lower bus voltage. Assuming that a 14 V external zener diode will be used on V
CC
, exact values of
R
S1
, R
S2
, and R
S3
were calculated as follows (values were calculated to operate the components just
below half their rated power):
V
P
=
R
2
R
S1
(
)
1
14
2
1
2
max
RS
V
V
W
Bus
=
(
)
(
)
W
V
V
1
W
V
V
R
Bus
S
2
14
170
2
1
14
2
2
1
max
=
=
≈
=
k
k
R
S
56
6
48
1
相關(guān)PDF資料
PDF描述
IRS4426 DUAL LOW SIDE DRIVER
IRS4428SPBF DUAL LOW SIDE DRIVER
IRS4426PBF DUAL LOW SIDE DRIVER
IRS4426S DUAL LOW SIDE DRIVER
IRS4426SPBF DUAL LOW SIDE DRIVER
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
IRS25401 制造商:IRF 制造商全稱:International Rectifier 功能描述:LED BUCK REGULATOR CONTROL IC
IRS25401PBF 功能描述:LED照明驅(qū)動(dòng)器 Hysteretic Buck LED Drvr 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
IRS25401PBF 制造商:International Rectifier 功能描述:IC LED DRVR DIP8
IRS25401SPBF 功能描述:LED照明驅(qū)動(dòng)器 200V HALF BRDG DRVR LED BUCK REGULATOR 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
IRS25401STRPBF 功能描述:LED照明驅(qū)動(dòng)器 Hysteretic Buck LED Drvr 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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