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參數(shù)資料
| 型號： | MIC4830 |
| 廠商： | Micrel Semiconductor,Inc. |
| 英文描述： | Low Noise 180Vp-p EL Driver |
| 中文描述： | 低噪聲180Vp磷EL驅(qū)動 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 846K |
| 代理商： | MIC4830 |
Micrel
MIC4830
September 2007
8
M9999-091307
(408) 955-1690
Application Information
Inductor
A 220μH Murata (LQH4C221K04) inductor is
recommended for most applications. Generally,
inductors with smaller values can handle more
current. Lowering the inductance allows the boost
regulator to draw more input current to deliver more
energy every cycle. As a result, a lower value
inductor may be used to drive larger panels or make
the current panel brighter. However, caution is
required as using a low value inductor with a low
switching
frequency
may
exceeding the absolute maximum rating of the
switch node and/or the CS pin. If the application
uses a low input voltage (1.8 to 3V), a lower value
inductor, such as 100μH, may be used in order to
drive the EL lamp at max brightness without issue.
result
in
voltages
Diode
An ideal diode to use would be the 1N4148 or
equivalent. It has a forward current of 150mA and a
typical forward voltage of 950mV. For applications
that are not cost driven, a fast switching diode with
lower forward voltage and higher reverse voltage
can be used to enhance the efficiency, such as
BAV20WS or BAS20W.
Output Capacitor
Low ESR capacitors should be used at the regulated
boost output (CS pin) of the MIC4830 to minimize
the switching output ripple voltage. The larger the
output capacitance, the lower the output ripple at the
CS pin. The reduced output ripple at the CS pin
along with a low ESR capacitor improves the
efficiency of the MIC4830 circuit. Selection of the
capacitor value will depend upon the peak inductor
current, inductor size, and the load. The MIC4830 is
as 2.2nF. For minimum audible noise, the use of a
C0G/NPO
dielectric
recommended. TDK and AVX offer C0G/NPO
dielectric capacitors in capacitances up to 2.7nF at
200V to 250V rating in 0805 size. If output ripple is a
concern a 0.01μF/200V X7R output capacitor is
recommended.
EL Lamp Terminals (VA, VB)
output
capacitor
is
An EL lamp is connected from VA to VB as the load.
The high voltage alternated across VA and VB by
the H-Bridge cycles generate luminance. The
voltage at VA and VB should not exceed the voltage
at V
CS
by more than 3V. This situation may become
present when noisy enable signals such as those
often generated by mechanical switches are applied
to the driver’s inputs. To prevent over voltage at VA
and VB, 10k
resistors may be placed in series from
VA to the EL panel and from VB to the EL panel. An
alternative to the use of 10k
resistors is to apply a
diode from the CS pin to VA and VB, where the
cathode of the diode is on the CS side and the
anode is on the VA and VB side, respectively.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MIC4830YML | Low Noise 180Vp-p EL Driver |
| MIC4830YMM | Low Noise 180Vp-p EL Driver |
| MIC4832 | Low Noise 220Vp-p EL Driver |
| MIC4832YML | Low Noise 220Vp-p EL Driver |
| MIC4832YMM | Low Noise 220Vp-p EL Driver |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MIC4830_09 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:Low Noise 180VPP EL Driver |
| MIC4830YML | 制造商:Rochester Electronics LLC 功能描述: 制造商:RF Micro Devices Inc 功能描述: |
| MIC4830YML TR | 功能描述:LED照明驅(qū)動器 180Vpp Low Noise EL Driver 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 |
| MIC4830YML-TR | 功能描述:IC EL DRIVER 180VPP LN 8-MLF 制造商:microchip technology 系列:- 包裝:剪切帶（CT） 零件狀態(tài):停產(chǎn) 類型:EL 燈驅(qū)動器 頻率:60Hz ~ 1kHz 電壓 - 電源:1.8 V ~ 5.5 V 電流 - 電源:45μA 電流 - 灌/拉輸出:- 調(diào)光:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-VFDFN 裸露焊盤，8-MLF? 圖號:* 制造商卷帶直徑:13"（330mm） 制造商卷帶材料:塑料 制造商卷帶寬度:12mm 供應(yīng)商器件封裝:8-MLF?（2x2） 標(biāo)準(zhǔn)包裝:1 |
| MIC4830YMM | 功能描述:LED照明驅(qū)動器 180Vpp Low Noise EL Driver 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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