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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)： | 5/14頁 |
| 文件大小： | 638K |
| 代理商： | HV857 |
5
HV857
External Component Description
External Component
Selection Guide Line
Diode
Fast reverse recovery diode, 150V Sanyo SB01-15 or equivalent.
Cs Capacitor
0.003
μ
F to 0.1
μ
F, 100V capacitor to GND is used to store the energy transferred from the inductor.
R
EL-osc
The EL lamp frequency is controlled via an external R
EL
resistor connected between R
EL-osc
and V
DD
of the
device. The lamp frequency increases as R
EL
decreases. As the EL lamp frequency increases, the amount
of current drawn from the battery will increase and the output voltage V
CS
will decrease. The color of the EL
lamp is dependent upon its frequency.
A 2M
resistor would provide lamp frequency of 205 to 275Hz. Decreasing the R
EL-osc
by a factor of 2 will
increase the lamp frequency by a factor of 2.
R
SW-osc
The switching frequency of the converter is controlled via an external resistor, R
SW
between R
SW-osc
and V
DD
of the device. The switching frequency increases as R
SW
decreases. With a given inductor, as the switching
frequency increases, the amount of current drawn from the battery will decrease and the output voltage, V
CS
,
will also decrease.
Lx Inductor
The inductor L
x
is used to boost the low input voltage by inductive flyback. When the internal switch is on,
the inductor is being charged. When the internal switch is off, the charge stored in the inductor will be
transferred to the high voltage capacitor C
. The energy stored in the capacitor is connected to the internal
H-bridge and therefore to the EL lamp. In general, smaller value inductors, which can handle more current,
are more suitable to drive larger size lamps. As the inductor value decreases, the switching frequency of the
inductor (controlled by R
SW
) should be increased to avoid saturation.
220
μ
H Murata (LQH32CN221) inductors with 8.4
series DC resistance is typically recommended. For
inductors with thesame inductance value but with lower series DC resistance, lower R
SW
value is needed to
prevent high current draw and inductor saturation.
Lamp
As the EL lamp size increases, more current will be drawn from the battery to maintain high voltage across
the EL lamp. The input power, (V
IN
x I
IN
), will also increase. If the input power is greater than the power
dissipation of the package (300mW), an external resistor in series with one side of the lamp is recommended
to help reduce the package power dissipation.
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| HV9100P | RF Choke; Series:Z; Inductance:84uH; Inductance Tolerance:+/- 10 %; DC Current Rating:1A; Self Resonant Frequency:13MHz; Terminal Type:Axial Leaded; Current Rating:1A; DC Resistance Max:4.7ohm; Frequency Max:20MHz |
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(fēng)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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