
Micrel's MIC4827 is a high output voltage, DC to AC converter, designed for driving electroluminescent (EL) lamps. The device operates from an input voltage range of 1.8V to 5.5V, making it suitable for 1-cell Li-Ion and 2- or 3-cell alkaline/NiCad/NiMH battery applications. The MIC4827 converts a low voltage DC input to a 180VPP AC output signal that drives the EL lamp.The MIC4827 is comprised of two stages: a boost stage, and an H-bridge, lamp driver stage. The boost stage steps the input voltage up to +90V. The H-bridge stage then alternately switches the +90V output to each terminal of the EL lamp, thus creating a 180VPP AC signal to drive the EL lamp and generate light.The MIC4827 features separate oscillators for the boost and H-bridge stages. External resistors independently set the operating frequency of each stage. This flexibility allows the EL lamp circuit to be optimized for maximum efficiency and brightness.The MIC4827 uses a single inductor and a minimum number of external components, making it ideal for portable, space-sensitive applications.The MIC4827 is available in an 8-pin MSOP package with an ambient temperature range of -40°C to +85°C.
1.8V to 5.5V DC input voltage
180VPP?regulated AC output waveform
Independently adjustable EL lamp frequency
Independently adjustable boost converter frequency
0.1μA shutdown current
MIC4827 封裝圖
型號(hào) | 制造商 | 描述 | 購(gòu)買 |
---|---|---|---|
MIC4827YMM-TR | Vishay Sprague | 鉭電容 軸向 | 立即購(gòu)買 |
MIC4827YMM | SII Semiconductor Corporation | ICVOLTDETECTOR | 立即購(gòu)買 |
Microchip Technology MIC24097評(píng)估板經(jīng)過(guò)完全組裝和測(cè)試,用于演示MIC24097的功能。MIC24097轉(zhuǎn)換器采用出色的自適應(yīng)導(dǎo)通時(shí)間控制架構(gòu)。該板基于降壓拓?fù)洌?dāng)輸入端配有5V至20V電壓時(shí),可提供1V輸出電壓,最大電流為20A。
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Micrel公司生產(chǎn)的MIC4827單片IC,是一種1.8-5.5V的低壓輸入而輸出電壓達(dá)180Vp-p的DC/AC轉(zhuǎn)換器,被用作驅(qū)動(dòng)電致發(fā)光(EL)燈。MIC4827適合于單節(jié)鋰離子電池或2-3節(jié)堿性電池及鎳氫/鎳鎘電池供電,在LCD背光、電話手機(jī)、PDA、計(jì)算器和...
采用MIC4827驅(qū)動(dòng)3平方英寸EL燈的實(shí)際電路如圖所示。該電路在Vin=3.3V下的輸入電流Iin=28mA,輸出電壓仍為180Vp-p,EL燈工作頻率fe1為106Hz。L1采用Murata公司的LQH4C221K04,電感值為220μH,最大DC電阻為4Ω。
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