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参数资料
| 型号： | MIC4826BMM TR |
| 厂商： | Micrel Inc |
| 文件页数： | 6/12页 |
| 文件大小： | 0K |
| 描述： | IC DRIVER EL DC-AC 160VPP 8MSOP |
| 标准包装： | 2,500 |
| 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： | 带卷 (TR) |
| 其它名称： | MIC4826BMMTR |
MIC4826
Micrel
Functional Diagram
V IN
1
V DD
L1
220 μ H
D1
C IN
R SW
2
RWS
Switch
Oscillator
5
SW
6
CS
C OUT
Q 1
R EL
V REF
EL
Oscillator
Q 2
8
VA
EL LAMP
Q 3
7
3
REL
Q 4
GND
4
Figure 1. MIC4826 Block Diagram
VB
f SW ( kHz ) =
FunctionalDescription
See “Application Information” for component selection and
pre-designed circuits.
Overview
The MIC4826 is a high voltage EL driver with an AC output
voltage of 160V peak-to-peak capable of driving EL lamps
up to 6 in 2 . Input supply current for the MIC4826 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 oscil-
lators’ 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 induc -
tor 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 op-
posite states to achieve a 160V peak-to-peak AC output
signal. The external resistor that connects to the REL pin
determines the EL frequency.
V IN = 3.0V
L = 220 μ H
C OUT = 0.01 μ F
Lamp = 2in 2
R SW = 332k
R EL = 3.32M
TIME (2ms/div)
Figure 2. 108Hz Typical Output Waveform
Switching Frequency
The switching frequency of the converter is controlled via
an external resistor between RSW pin and VDD pin of the
device. The switching frequency increases as the resistor
value decreases. For resistor value selections, see “Typical
Characteristics: Switching Frequency vs. Switch Resistor”
or use the equation below. The switching frequency range
is 8kHz to 200kHz, with an accuracy of ±20%.
36
R SW ( M ? )
MIC4826
6
March 2009
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC4826YMM | 功能描述:LED照明驱动器 160V 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 |
| MIC4826YMM TR | 功能描述:LED照明驱动器 160V 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 |
| MIC4826YMM | 制造商:Micrel Inc 功能描述:Driver IC |
| MIC4826YMMTR | 制造商:Micrel 功能描述:EL Lamp Driver 5.5V 8-Pin MSOP T/R |
| MIC4826YMM-TR | 功能描述:IC DRIVER EL DC-AC 160VPP 8MSOP 制造商:microchip technology 系列:- 包装:剪切带（CT） 零件状态:有效 类型:EL 灯驱动器 频率:60Hz ~ 1kHz 电压 - 电源:1.8 V ~ 5.5 V 电流 - 电源:21μA 电流 - 灌/拉输出:- 调光:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 图号:576；8MSOP；MM；8 制造商卷带直径:13"（330mm） 制造商卷带材料:塑料 制造商卷带宽度:12mm 供应商器件封装:8-MSOP 标准包装:1 |
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