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參數(shù)資料
| 型號： | MIC4830YMM |
| 廠商： | MICREL INC |
| 元件分類： | 顯示驅(qū)動器 |
| 英文描述： | Low Noise 180Vp-p EL Driver |
| 中文描述： | EL DISPLAY DRIVER, PDSO8 |
| 封裝： | ROHS COMPLIANT, MSOP-8 |
| 文件頁數(shù)： | 6/12頁 |
| 文件大?。?/td> | 846K |
| 代理商： | MIC4830YMM |
Micrel
MIC4830
Functional Diagram
September 2007
6
M9999-091307
(408) 955-1690
Figure 1. MIC4830 Block Diagram
Functional Description
Overview
The MIC4830 is a high-voltage EL driver with an AC
output voltage of 180V peak-to-peak capable of
driving EL lamps up to 4 in
2
. Input supply current for
the MIC4830 is typically 45μA reducing to 10nA in
shutdown. The high voltage EL driver has two
internal oscillators to control the switching MOSFET
and the H-bridge driver. Both of the internal
oscillators’
frequencies
programmed through the external resistors to
maximize the efficiency and the brightness of the EL
lamp.
can
be
individually
Regulation
Referring to Figure 1, initially power is applied to
V
DD
. The internal feedback voltage is less than the
reference voltage causing the internal comparator to
go low which enables the switching MOSFET’s
oscillator. When the switching MOSFET turns on,
current flows through the inductor and flows into the
switch. The switching MOSFET will typically turn on
for 90% of the switching period. During the on-time,
energy is stored in the inductor. When the switching
MOSFET turns off, current flowing into the inductor
forces the voltage across the inductor to reverse
polarity. The voltage across the inductor rises until
the external diode conducts and clamps the voltage
at V
OUT
+ V
D1
. The energy in the inductor is then
discharged into the C
OUT
capacitor. The internal
comparator continues to turn the switching MOSFET
on and off until the internal feedback voltage is
above the reference voltage. Once the internal
feedback voltage is above the reference voltage, the
internal
comparator
turns
MOSFET’s oscillator.
off
the
switching
When the EL oscillator is enabled, V
A
and V
B
switch
in opposite states to achieve an 180V peak-to-peak
AC output signal. The external resistor that connects
to the REL pin determines the EL frequency.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MIC4830YMM 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 |
| MIC4832 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:Low Noise 220VPP EL Driver |
| MIC4832_09 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:Low Noise 220VPP EL Driver |
| MIC4832YML | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:Low Noise 220Vp-p EL Driver |
| MIC4832YML TR | 功能描述:LED照明驅(qū)動器 220Vpp 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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