Four-String White LED Driver

GENERAL DESCRIPTION The ADD5205is a white LED driver for backlight applications based on high efficiency, current mode, step-up converter technology. It is designed with a 0.3 Ω internal switch and 1 MHz fixed operating frequency. The ADD5205contains four regulated constant current sources for

文件：441.07 Kbytes 頁(yè)數(shù)：16 Pages

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四串白光LED驅(qū)動(dòng)器

ADD5205是一款基于高效率、電流模式、升壓轉(zhuǎn)換器技術(shù)的白光LED驅(qū)動(dòng)器，適合背光應(yīng)用。它具有一個(gè)0.3 Ω內(nèi)部開關(guān)，固定工作頻率為1 MHz。ADD5205內(nèi)置四個(gè)調(diào)節(jié)恒流源，可實(shí)現(xiàn)均勻的亮度。每個(gè)電流源可驅(qū)動(dòng)的最高電流為25 mA。\nADD5205有四個(gè)并聯(lián)的LED串，各串包含多個(gè)串聯(lián)LED，電流匹配精度為±2%。該器件提供可調(diào)的電流源，使用外部電阻時(shí)最高可驅(qū)動(dòng)25 mA的電流。LED電流可通過PWM引腳上的PWM信號(hào)輸入控制。內(nèi)部電路使用一個(gè)外部電阻將PWM信號(hào)轉(zhuǎn)換成模擬信號(hào)，并以線性方式控制LED電流。\nADD5205具有多種安全保護(hù)特性，防止器件在故障狀況下受損。若一個(gè) 基于感性升壓轉(zhuǎn)換器的白光LED驅(qū)動(dòng)器\n- 輸入電壓范圍：2.8 V 至 18 V\n- 內(nèi)部補(bǔ)償\n- 1 MHz固定工作頻率\n- 28 V固定過壓保護(hù)\n- 升壓轉(zhuǎn)換器內(nèi)置軟啟動(dòng)功能 \n最多驅(qū)動(dòng)4個(gè) LED電流源\n- 可調(diào)LED電流，每個(gè)通道最高可達(dá)25 mA\n- 內(nèi)置PWM輸入的直流電平亮度控制\n- LED開路故障保護(hù)\n通用特性\n- 熱關(guān)斷\n- 欠壓閉鎖\n- 12引腳、3 mm × 3 mm × 0.75 mm LFCSP封裝 ;

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Four-String White LED Driver

GENERAL DESCRIPTION The ADD5205is a white LED driver for backlight applications based on high efficiency, current mode, step-up converter technology. It is designed with a 0.3 Ω internal switch and 1 MHz fixed operating frequency. The ADD5205contains four regulated constant current sources for

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Dual, 35 dB Range, 1 dB Step Size DGA

文件：1.76888 Mbytes 頁(yè)數(shù)：32 Pages

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Dual, 35 dB Range, 1 dB Step Size DGA

FEATURES Dual, independent, digitally controlled gain amplifier (DGA) ?9 dB to +26 dB gain range 1 dB step size, ±0.2 dB accuracy at 200 MHz 100 Ω differential input resistance 10 Ω differential output resistance 1.2 dB change in noise figure for first 12 dB of gain reduction Output third-orde

文件：1.36837 Mbytes 頁(yè)數(shù)：31 Pages

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Dual, 35 dB Range, 1 dB Step Size DGA

文件：1.76888 Mbytes 頁(yè)數(shù)：32 Pages

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