參數(shù)資料
型號(hào)： HV9903
廠商： Supertex, Inc.
元件分類(lèi)： LED驅(qū)動(dòng)器
英文描述： White LED Driver
中文描述： 白光LED驅(qū)動(dòng)器
文件頁(yè)數(shù)： 9/12頁(yè)
文件大?。?/td> 326K
代理商： HV9903
Component selection is similar to the Li-ion battery
application with the exception of the inductor and C
DD
capacitor. Since high current is no longer being
drawn from V
DD
, C
DD
may be lowered to around 10nF.
C
IN
should be 1
μ
F. In selecting the inductor, use the
following graphs.
Inductor Value for 1.8V Operation
5V
10V
15V
20V
25V
1 H
10 H
100 H
V
LED-STRING
+ (I
LED
· 5
) + V
D
V
LED-STRING
+ (I
LED
-5
) +V
D
I
5mA
10mA
15mA
20mA
25mA
30mA
I
LED
I
LED
Select the next lower standard value,
taking inductor tolerance into account.
Inductor Rating for 1.8V Operation
5V
10V
15V
20V
25V
V
LED-STRING
+ (I
LED
· 5
) + V
D
5mA
10mA
15mA
20mA
I
LED
25mA
30mA
35mA
40mA
Exceeds max recommended SW current
10mA
100mA
1A
P
Apply correction factor and select an
inductor with an equal or higher rating.
Don’t forget to apply the correction factor and confirm
that the inductor is not saturating and the driver is
operating in discontinuous mode, as outlined earlier.
Board Layout
Since high frequencies are involved, PCB layout is
critical. To minimize parasitic inductance and radiated
EMI, the loop area of the high frequency paths must
be kept to a minimum. Second, try to keep the two
loop areas as concentric as possible. Lastly, make
traces as short and wide as possible. To avoid LED
current errors, keep the R
SET
ground connection
separate from high current ground paths and connect
directly to pin 2.
The following schematic depicts the high frequency
paths and their enclosed areas.
6
5
4
3
LED
R
SET
SHDN
V
DD
HV9903
L
D
R
SET
V
DD
Shutdown
Fault
SW
GND
1
2
SW closed
SW open
Keep these
areas small
C
DD
C
OUT
Keep ground
connection seperate
and direct to pin 2
The following PCB layout is recommended.
HV9903
C
OUT
GND
R
SET
C
DD
L
V
DD
D
SHDN
V
LED-STRING
+ (I
LED
-5
) +V
D
HV9903
HV9903
9
相關(guān)PDF資料
PDF描述
HV9904 HV9904 Multi Converter Controller
HV9904LG HV9904 Multi Converter Controller
HV9904P HV9904 Multi Converter Controller
HV9904X HV9904 Multi Converter Controller
HV9906 Simple Off-Line/PFC & >9V DC/DC Switcher
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(dòng)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
HV9903K6-G 功能描述:LED照明驅(qū)動(dòng)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
HV9904 制造商:SUPERTEX 制造商全稱:SUPERTEX 功能描述:HV9904 Multi Converter Controller
HV9904LG 功能描述:功率驅(qū)動(dòng)器IC HVCMOS D2 RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類(lèi)型:Low Cost High or Low Side MOSFET Driver 上升時(shí)間: 下降時(shí)間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*