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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驅動器采用IRS2540 |
| 文件頁數(shù)： | 18/28頁 |
| 文件大?。?/td> | 839K |
| 代理商： | IRS2540 |
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18
RD-0608
www.irf.com
1
2
3
4
8
7
6
5
OUT1
GND
IN1(+)
IN2(+)
IN2(-)
OUT2
VCC
IN1(-)
L
POT1
CVCC3
CVCC4
DEN2
R1
R2
R3
R4
R5
R6
C1
C2
COM
VBUS
IC2
RS2
Out to
ENN pin
Fig. 22: Suggested PWM Driver (not included in IRPLLED1)
If an external supply for V
CC
is used, the minimum amount of dimming achievable (light output
approaches 0%) will be determined by the “on” time of the HO output, when in a fully functional
regulating state. To maintain reliable dimming, it is recommended to keep the “off” time of the enable
signal at least 10 times that of the HO “on” time. For example, if the application is running at 75 kHz
with an input voltage of 100 V and an output voltage of 20 V, the HO “on” time will be 3.3 μs (one-
fourth of the period – see calculations below) according to standard buck topology theory. This will
set the minimum “off” time of the enable signal to 33 μs.
V
Cycle
Duty
in
%
20
100
*
100
20
100
=
=
=
V
V
V
out
s
kHz
HO
on
μ
3
75
1
*
%
20
time
=
=
If the chip is supplied from the output, a large enough capacitor on V
CC
is required to maintain
sufficient current while in a disabled state. For this evaluation board, where the IC supply comes from
the output, a 10 μF capacitor is used to ensure continued proper operation while disabled, the output is
capable of dimming down to roughly 10 V. A “strobe light” effect in the LEDs may be observed if
V
CC
drops too much or if the dimming frequency is too low.
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相關代理商/技術參數(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: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
| IRS25401STRPBF | 功能描述:LED照明驅動器 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: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
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