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參數(shù)資料
| 型號： | 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)動器采用IRS2540 |
| 文件頁數(shù)： | 5/28頁 |
| 文件大?。?/td> | 839K |
| 代理商： | IRS2540 |
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5
RD-0608
www.irf.com
The switching continues to regulate the current at an average value determined as follows: when the
output combination of L
1
and C
OUT
is large enough to maintain a low ripple on I
FB
(approximately less
than 100 mV), I
out(avg)
can be calculated:
VIFBTH
avg
Iout
=
)
(
RCS
Having load current programmable from 350 mA to 1.5 A, series and parallel combinations of resistors
must be used to properly set the current, as well as distribute power accordingly. Equivalent
resistances for each current setting were calculated as follows:
5
350
mA
5
700
mA
5
1
A
5
5
A
Since some of these equivalent values of resistance are not available, series and parallel combinations
are used, and they are specified as follows (all combinations use standard value resistors: 1.43
, 0.56
, and 0.47
):
=
43
.
350
mA
R
≈
=
43
.
71
.
700
mA
R
+
≈
=
)
56
.
47
.
5
1
A
R
+
≈
=
47
.
||
56
.
47
.
33
.
5
A
R
Although some of the series and parallel combinations do not yield the exact resistance needed, for all
tolerance purposes, they are accurate enough. For this evaluation board, an extremely tight current
regulation was achieved with a worst case result of ±1.2% for the 350 mA setting as the bus voltage
was swept from 40 V to 170 V. Likewise a precise regulation of ±0.25% was maintained for a varying
load voltage from 16 V to 24 V for the 350 mA current setting.
=
=
43
.
350
V
R
mA
=
=
71
.
700
V
R
mA
=
=
5
1
V
R
A
=
=
33
.
5
V
R
A
=
715
.
)
43
.
||
=
+
515
.
)
56
.
47
.
||
=
+
+
343
.
)
56
.
47
.
||
56
.
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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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