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參數(shù)資料
| 型號： | MIC4826YMM |
| 廠商： | MICREL INC |
| 元件分類： | 顯示驅(qū)動器 |
| 英文描述： | Low Input Voltage, 160VPP Output Voltage, EL Driver |
| 中文描述： | EL DISPLAY DRIVER, PDSO8 |
| 封裝： | LEAD FREE, MSOP-8 |
| 文件頁數(shù)： | 6/12頁 |
| 文件大?。?/td> | 123K |
| 代理商： | MIC4826YMM |
MIC4826
Functional Diagram
Micrel
MIC4826
6
August 2004
Q
1
Q
2
Q
3
Q
4
EL
Oscillator
GND
4
VB
EL LAMP
7
VA
8
CS
6
SW
C
OUT
D1
L1
220
μ
H
5
1
RWS
R
SW
C
IN
2
REL
R
EL
3
Switch
Oscillator
V
DD
V
REF
V
IN
Figure 1. MIC4826 Block Diagram
Functional Description
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 21
μ
A
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
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 oscil-
lator.
When the EL oscillator is enabled, V
A
and V
B
switch in
opposite states to achieve a 160V peak-to-peak AC output
signal. The external resistor that connects to the REL pin
determines the EL frequency.
TIME (2ms/div)
V
B
(
V
A
(
V
A
—
V
B
(
V
= 3.0V
L = 220
μ
H
C
= 0.01
μ
F
Lamp = 2in
2
R
SW
= 332k
R
EL
= 3.32M
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%.
f
kHz
(
R
M
(
SW
SW
)
)
=
36
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MIC4826YMM TR | 功能描述:LED照明驅(qū)動器 160V EL Driver (Lead Free) 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 |
| 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:- 包裝:剪切帶（CT） 零件狀態(tài):有效 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:21μA 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-TSSOP，8-MSOP（0.118"，3.00mm 寬） 圖號:576；8MSOP；MM；8 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-MSOP 標準包裝:1 |
| MIC4827 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:Low Input Voltage, 180VPP Output Voltage, EL Driver |
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