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參數資料
| 型號： | HV9903 |
| 廠商： | Supertex, Inc. |
| 元件分類： | LED驅動器 |
| 英文描述： | White LED Driver |
| 中文描述： | 白光LED驅動器 |
| 文件頁數： | 1/12頁 |
| 文件大小： | 326K |
| 代理商： | HV9903 |
White LED Driver
Features
Power efficiency of up to 85%
Drives up to 6 White LEDs
2.6V to 4.6V Supply
power stage can operate at 1.8V (see page 8)
Built-in Soft Start
DC and PWM Dimming Control
Built-in Open LED protection
Open LED indicator (via R
SET
)
1.2MHz Fixed Switching Frequency
500nA max leakage current when disabled
No leakage current path through LEDs when
disabled
Resistor-programmable LED Current
Small 6-lead MLP (3mm x 3mm) package
(similar to 6-pin SOT-23)
Applications
Color LCD Backlighting
Cell phones, smart phones
PDAs, pocket PCs
Organizers
Digital Cameras
MP3 Players
Description
The Supertex HV9903 is a fixed frequency DC-DC
boost converter designed for driving Light Emitting
Diodes (LEDs) with constant current where the light
intensity is proportional to the current through them.
The input supply voltage range into the device (V
DD
)
is 2.6 to 4.6V. Operation of the driver at lower
voltages is possible as long as a 2.6–4.6V low-
current supply is available for the HV9903. The
device uses a single inductor and a minimum
number of passive components. The device can be
enabled/disabled via the SHDN pin.
The HV9903 has an internal oscillator. The oscillator
frequency is at fixed frequency of 1.2MHz that allows
use of small value inductors. The LED current can
be adjusted from 5 to 40mA by an external resistor
connected between the R
SET
and the GND pins. The
amount of current though the LED can also be
adjusted via DC voltage or a pulse width modulated
(PWM) signal to the R
SET
pin.
Soft-start is implemented on-chip, minimizing inrush
current to only 30% over steady state current.
An open LED circuit detects an open LED condition,
disables the driver, and sets the R
SET
pin high. The
driver is re-enabled by asserting SHDN low, then
high. If the open LED condition persists, the driver
will again latch off.
Typical Application
HV9903
Initial Release
Supertex Inc. does not recommend the use of its products in life support applications and will not knowingly sell its products for use in such applications unless it receives an adequate "products
liability indemnification insurance agreement." Supertex does not assume responsibility for use of devices described and limits its liability to the replacement of devices determined to be
defective due to workmanship. No responsibility is assumed for possible omissions or inaccuracies. Circuitry and specifications are subject to change without notice. For the latest product
specifications, refer to the Supertex website: http://www.supertex.com. For complete liability information on all Supertex products, refer to the most current databook or to the Legal/Disclaimer
page on the Supertex website.
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相關代理商/技術參數 |
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| HV9903DB1 | 制造商:Supertex Inc 功能描述: |
| HV9903K6 | 功能描述:LED照明驅動器 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: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
| HV9903K6-G | 功能描述:LED照明驅動器 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:功率驅動器IC HVCMOS D2 RoHS:否 制造商:Micrel 產品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
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