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參數(shù)資料
| 型號： | HV9903 |
| 廠商： | Supertex, Inc. |
| 元件分類： | LED驅(qū)動器 |
| 英文描述： | White LED Driver |
| 中文描述： | 白光LED驅(qū)動器 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 326K |
| 代理商： | HV9903 |
PWM Dimming via R
SET
1
6
5
4
2
3
SW
GND
LED
R
SET
SHDN
V
DD
HV9903
L
D
C
OUT
C
DD
R
SET
V
DD
Shutdown
PWM
(
)
SET
avg
)
(
LED
I
R
D
V
5
22
1
The logic signal must have a low output impedance
relative to R
SET
and be capable of going to within a
few millivolts of ground. The following modification
provides higher immunity to the logic low voltage level
(V
LO
). It also minimizes the effect of voltage
differences between the HV9903’s ground and the
PWM signal source’s ground.
PWM Dimming via R
SET
1
6
5
4
2
3
SW
GND
LED
R
SET
SHDN
V
DD
HV9903
L
D
C
OUT
C
DD
R
SET
V
DD
Shutdown
PWM
R
PWM
1
100mV
HI
SET
PWM
V
R
R
(
)
PWM
LO
SET
LED
I
R
V
R
D
mV
100
mV
100
1
225
avg
)
(
DC dimming may be implemented in discrete steps
using logic signals, as shown below.
Multi-level Logic Dimming
1
6
5
4
2
3
SW
GND
LED
R
SET
SHDN
V
DD
HV9903
L
D
C
OUT
C
DD
R
SET
V
DD
Shutdown
Dual-cell Alkaline Operation
The HV9903 LED driver may be used in 2-cell alkaline
battery applications (1.8V min) by powering the power
stage directly from the batteries, while powering the
HV9903 from an available 3.3V supply. Supplying the
power stage directly from the batteries reduces the
load on the 3.3V supply, which in turn increases
overall efficiency and keeps components small. The
same dimming techniques used in the single-supply
application may be used in this dual-supply
application.
2-cell Alkaline Circuit
1
6
5
4
2
3
SW
GND
LED
R
SET
SHDN
V
DD
HV9903
L
D
C
OUT
C
IN
R
SET
Shutdown
Fault
C
DD
2.6–4.6V
1.8–3.0V
V
DD
HV9903
HV9903
8
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HV9903DB1 | 制造商:Supertex Inc 功能描述: |
| HV9903K6 | 功能描述:LED照明驅(qū)動器 White 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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