参数资料
| 型号： | MIC4830YMM TR |
| 厂商： | Micrel Inc |
| 文件页数： | 8/12页 |
| 文件大小： | 0K |
| 描述： | IC DRIVER LN 180VP-P EL 8MSOP |
| 标准包装： | 2,500 |
| 类型： | EL 灯驱动器 |
| 频率： | 60Hz ~ 1kHz |
| 电流 - 电源： | 45µA |
| 电源电压： | 1.8 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-MSOP |
| 包装： | 带卷 (TR) |
Micrel
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 result in voltages
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.
Diode
The diode must have a high reverse voltage (150V),
since the output voltage at the CS pin can reach up
to 110V. A fast switching diode with lower forward
voltage and higher reverse voltage (150V), such as
BAV20WS/BAS20W, can be used to enhance
efficiency.
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
MIC4830
capacitor value will depend upon the peak inductor
current, inductor size, and the load. The MIC4830 is
designed for use with an output capacitance as low
as 2.2nF. For minimum audible noise, the use of a
C0G/NPO dielectric output capacitor is
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)
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 Ω 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 Ω 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.
July 2009
8
M9999-070709-C
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| MIC4832 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:Low Noise 220VPP EL Driver |
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| MIC4832YML TR | 功能描述:LED照明驱动器 220Vpp Low Noise EL Driver RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
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