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参数资料
| 型号： | MIC4827YMM |
| 厂商： | Micrel Inc |
| 文件页数： | 7/15页 |
| 文件大小： | 0K |
| 描述： | IC EL DRIVER 180VPP OUT 8-MSOP |
| 标准包装： | 100 |
| 类型： | EL 灯驱动器 |
| 频率： | 60 ~ 1000 Hz |
| 电流 - 电源： | 21µA |
| 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： | 管件 |
| 产品目录页面： | 1083 (CN2011-ZH PDF) |
| 其它名称： | 576-1803-5 MIC4827YMM-ND |
Micrel, Inc.
Block Diagram
MIC4827
V IN
1
V DD
L1
220μH
D1
C IN
R SW
2
RSW
Switch
Oscillator
5
SW
6
CS
C OUT
Q 1
R EL
Q 2
8
VA
V REF
EL
Oscillator
/Q 3
7
EL LAMP
3
REL
4
GND
/Q 4
VB
Figure 1. MIC4827 Block Diagram
Functional Description
Overview
The MIC4827 is a high-voltage EL driver with an AC
output voltage of 180V peak-to-peak capable of driving
EL lamps up to 6in 2 . Input supply current for the
MIC4827 is typically 21μA with a typical shutdown
current of 10nA. 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 can be individually programmed through the
external resistors to maximize the efficiency and the
brightness of the lamps.
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 into the switch. The switching MOSFET will
typically turn on for 90% of the switching frequency.
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 off the switching MOSFET’s oscillator.
When the EL oscillator is enabled, V A and V B switch in
opposite states to achieve a 180V peak-to-peak AC
output signal. The external resistor that connects to the
REL pin determines the EL frequency.
July 2009
7
M9999-070709-A
(408) 955-1690
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC4827YMM TR | 功能描述:LED照明驱动器 180V EL Driver (Lead Free) 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 |
| MIC4827YMM | 制造商:Micrel Inc 功能描述:Driver IC |
| MIC4830 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:Low Noise 180Vp-p EL Driver |
| MIC4830_09 | 制造商:MICREL 制造商全称: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: |
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