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參數(shù)資料
| 型號： | HV857 |
| 廠商： | ELAN Microelctronics Corp . |
| 英文描述： | High Voltage EL Lamp Driver for Low Noise Applications(高電壓,低噪雙路EL燈驅(qū)動器) |
| 中文描述： | 高壓發(fā)光燈驅(qū)動器的低噪聲的應(yīng)用（高電壓，低噪雙路發(fā)光燈驅(qū)動器） |
| 文件頁數(shù)： | 1/14頁 |
| 文件大小： | 638K |
| 代理商： | HV857 |
HV857
11/14/01
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.
HV857
High Voltage EL Lamp Driver for
Low Noise Applications
Features
Patent pending audible noise reduction
Patent pending lamp aging compensation
190V
PP
output voltage for higher brightness
Patented output timing for high efficiency
Single cell lithium ion compatible
150nA shutdown current
Wide input voltage range 1.8V to 5.0V
Separately adjustable lamp and converter frequencies
Output voltage regulation
Split supply capability
Applications
LCD backlighting
Mobile cellular phones
PDAs
Handheld wireless communication products
Global Positioning Systems (GPS)
General Description
The Supertex HV857 is a high voltage driver designed for driving
Electroluminescent (EL) lamps of up to 5 square inches. The
input supply voltage range is from 1.8V to 5.0V. The device uses
a single inductor and a minimum number of passive components.
The nominal regulated output voltage that is applied to the EL
lamp is
±
95V. The chip can be enabled/disabled by connecting
the resistor on R
sw-osc
to V
DD
/ground.
The HV857 has two internal oscillators, a switching MOSFET,
and a high voltage EL lamp driver. The frequency for the
switching MOSFET is set by an external resistor connected
between the R
sw-osc
pin and the supply pin V
DD
. The EL lamp
driver frequency is set by an external resistor connected be-
tween R
pin and the V
pin. An external inductor is
connected between the L
X
and V
DD
pins or V
IN
for split supply
applications. A 0.003-0.1
μ
F capacitor is connected between C
s
and ground. The EL lamp is connected between V
A
and V
B
.
The switching MOSFET charges the external inductor and
discharges it into the capacitor at C
s
. The voltage at C
will start
to increase. Once the voltage at C
s
reaches a nominal value of
95V, the switching MOSFET is turned OFF to conserve power.
The outputs V
and V
are configured as an H bridge and are
switching in opposite states to achieve
±
95V across the EL lamp.
Typical Application
EL Lamp
+
_
C
S
1
2
3
4
8
6
5
HV857MG
7
V
DD
=V
IN
V
DD
R
SW-osc
R
EL-osc
Gnd
L
X
C
S
V
B
V
A
L
X
C
IN
Regulated Voltage=V
DD
Enable Signal
ON=V
DD
OFF=0
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HV857_07 | 制造商:SUPERTEX 制造商全稱:SUPERTEX 功能描述:Low Noise, High Voltage EL Lamp Driver IC |
| HV857DB1 | 功能描述:電源管理IC開發(fā)工具 HV857 Demo Board RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| HV857K7-G | 功能描述:顯示驅(qū)動器和控制器 High Voltage Low Noise EL Lamp RoHS:否 制造商:Panasonic Electronic Components 工作電源電壓:2.7 V to 5.5 V 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel |
| HV857L | 制造商:SUPERTEX 制造商全稱:SUPERTEX 功能描述:Low Noise, High Voltage EL Lamp Driver IC |
| HV857LDB1 | 功能描述:電源管理IC開發(fā)工具 HIGH VOLTAGE LOW NOISE EL LAMP DRIVER DEMOBOARD RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
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