【成功案例】SGM3127YN6G/TR白光LED驱动芯片在智能音箱LCD屏背光调节中的应用

时间： 2019-05-24 来源：世强

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笔者设计了一款智能音箱，它能够感知周围环境的光照强度而自动调节LCD屏背光亮度。这不仅给用户在不同光照环境下带来了更好的视觉体验，也达到了音箱低功耗，节能的目的，音箱电池也用得更久。此项目中，笔者使用的背光驱动芯片为圣邦微SGM3127YN6G/TR。

SGM3127YN6G/TR是圣邦微推出的一款高性能白光LED驱动器，它最多可驱动4个LED，可通过调节PWM占空比实现亮度调节。并且SGM3127YN6G/TR还具有低压差特性，每个通道输出电流达30mA时，其压差仅为50mV。另一方面，SGM3127YN6G/TR的供电电压范围2.5V~5.5V。EN为低电平为低时，其关断电流不超过1uA，因此适合低功耗产品的设计。SGM3127YN6G/TR还可支持过热保护，有效确保系统可靠性。SGM3127YN6G/TR的工作温度范围为-40~+85℃，采用SOT-23-6封装，非常适合便携产品的设计。

SGM3127YN6G/TR的典型应用为：

本智能音箱设计方案及框图

•主芯片采用全志G102，带3.0英寸LCD屏，Android系统。

•G102负责显示，人机交互，外设控制，以及通过WIFI获取网络节目后由IIS输出数字音频信号。音效芯片对IIS做D/A处理，EQ调整后输出L/R模拟信号给功放芯片；功放对L/R音频信号进行功率放大后由喇叭输出。

•人机交互通过LCD屏实现，G102通过RGB接口将显示数据传给LCD屏，驱动LCD屏显示。同时，G102也可输出不同占空比的PWM信号，实现LCD屏亮度的动态调节。

•系统框图如下：

•部分原理图如下：

•PCBLAYOUT如下：

•PCBA实物如下：

注意事项：

•EN 脚不能接uF级别大电容，否则开关机瞬间容易因电容充放电产生的残电造成EN使能误触发，从而导致开关机瞬间闪屏。

关键物料清单：

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用户43004597 Lv7. 资深专家 2019-11-18

SGM3127的供电电压范围2.5V~5.5V。EN为低电平为低时，其关断电流不超过1uA，适合低功耗产品的设计。

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SGMICRO（圣邦微）信号链和电源管理芯片选型指南

描述- SGMICRO specializes in high-performance and high-quality analog and mixed-signal integrated circuits, and is committed to building a comprehensive portfolio of the highest quality analog and mixed-signal integrated circuits to address all customer needs.

型号- 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

2024/6/11 - SGMICRO - 选型指南代理服务技术支持现货查询批量订货查看更多版本

SGMICRO（圣邦微）信号链和电源管理芯片选型指南

目录- Company Profile Amplifiers Comparators Data Converters Voltage References Audio/Video Drivers Analog Switches Logic Ics Temperature Sensors RF Switches Supervisory Circuits LDOs System Power Management Ics Battery Management Ics LED Drivers LCD & OLED Display Powers and Drivers Switch Mode Power Ics Application-Specific Auxiliary Powers Motor/Gate Driver Index

型号- SGM61450,SGM3733B,SGM2558A,SGM5347-12,SGM2558B,SGM8261-5,SGM2564,SGM8261-1,SGM5347-10,SGM8261-2,SGM2549,SGM48017C,SGM72110,SGM8094,SGM836,SGM8091,SGM837,SGM61220,SGM8092,SGM8093,SGM835,SGM72108,SGM2553,SGM72106,SGM2555,SGM809B,SGM4519,SGM4517,SGM48018,SGM4518,SGM48010,SGM63600,SGM4520,SGM4521,SGM48005,SGM8417-4,SGM8417-2,SGM4051C,SGM48000,SGM48001,SGM48002,SGM3843A,SGM61433,SGM84782,SGM621,SGM58031,SGM620,SGM41600,SGM2572,SGM41603,SGM2571,SGM2574,SGM51622H,SGM4995,SGM4511,SGM4996,SGM4512,SGM2576,SGM2575,SGM4510,SGM2578,SGM4515,SGM4516,SGM8250-1,SGM8250-2,SGM4514,SGM3209,SGM809,SGM8557-3,SGM8557-1,SGM8557-2,SGM803,SGM61012,SGM804,SGM802,SGM61013,SGM810,SGM811,SGM4782,SGM7237B,SGM8902,SGM8903,SGM8904,SGM4542,SGM8905,SGM4548,SGM4549,SGM3699,SGM4546,SGM4547,SGM48013C,SGM62110,SGM61020,SGM62112,AAP6153A,SGM61022,SGM62111,SGM800,SGM2553/D,SGM2596,SGM3200,SGM3206,SGM8270-2,SGM3207,SGM4535,SGM3204,SGM8270-4,SGM8T245,SGM829,SGM61230,SGM42512,SGM41664,SGM825,SGM823,SGM61234,SGM824,SGM891B,SGM832,SGM42507,SGM42506,SGM830,SGM831,SGM4563,SGM40567,SGM4560,SGM42505,SGM4561,SGM6503,SGM4566,SGM6502,SGM8925,SGM6501,SGM8926,SGM4564,SGM8927,SGM5349-16,SGM6505,SGM4568,SGM6504,SGM8909,SGM890B,SGM816,SGM42501,SGM40565,SGM42500,SGM814,SGM815,SGM812,SGM40560,SGM40561,SGM821,SGM822,SGM820,SGM4551,SGM4552,SGM4550,SGM4555,SGM4556,SGM4553,SGM4554,FT2910,SGM8910,SGM5347-8,SGM4558,SGM11124F,74LVC2T45,SGM893B,SGM4581,SGM8941,SGM4582,SGM4583,SGM8704,SGM4588,SGM8705,SGM4589,SGM8706,SGM8707,SGM8942,SGM8701,SGM8702,SGM8703,SGM12213A,SGM892B,SGM6510,SGM8276-4,SGM4573,SGM3001,SGM4574,SGM42513,SGM6514,SGM6513,SGM3005,SGM4578,SGM6512,SGM8276-2,SGM3002,SGM42622B,SGM6511,SGM8276-1,SGM3003,SGM4576,SGMOP17C,SGM6518,SGM8931,SGM8932,SGM6516,SGM12214A,SGM8933,SGM6515,SGM8934,74AVC8T245,SGM3141B,SGM42553,SGM61031,SGM62116,SGM62115,SGM8953-1,SGM62118,SGM8953-2,SGM62117,SGM8708,SGM8709,SGM4075-2,SGM3140B,SGM4075-1,SGM42544,SGM7300A,SGM7300B,SGM42541,SGM42540,SGM8951,SGM8710,SGM8952,SGM5200,SGM38045,SGM38042,SGM6533,SGM8711,SGM8712,SGM8955,SGM38046,SGM8956,SGM8199L2,LM2904,SGM8199L1,SGM41002,SGM8968-4,SGM8968-2,LM2902,SGM8968-1,SGM8740,SGM8741,SGM8742,SGM8743,SGM8263-1,SGM8748,SGM8263-2,SGM8417-1,SGM8749,SGM8744,SGM40666B,SGM8745,SGM40666A,SGM8746,SGM8747,SGM41513D,SGM41513A,SGM42561,SGM42560,SGM8957-1,SGM8957-2,SGM42562,SGM5208-14,SGM5223,SGM48018C,SGM11102F,SGM41512A,SGM37603A,SGM8521,SGM8522,SGM5018,74LVTN16244,74LVTN16245,SGM8524,SGM8604-1,SGM11103F,SGM8193A3,SGM8604-5,SGM8193A2,SGM8604-2,SGM48019C,SGM8193A1,SGM8604-3,SGM8193A0,SGM37604A,SGM8751,SGM41007,SGM41008,SGM6332,SGM8750,SGM41280,SGM41281,SGM41283,SGM5353-16,SGM37891A,SGM41285,SGM41286,SGM8542,SGM51652H8,SGM8301,SGM8543,SGM8302,SGM8544,SGM8545,SGM51652H4,SGM8541,SGM8429C-4,SGM8304,SGM37892A,SGM8531,SGM8773,SGM8532,SGM8774,SGM8534,74LVTH125,SGM8770,SGM8771,SGM8772,SGM8535,SGM8536,SGM8537,SGM8538,SGM65230,74LVC2G04,SGM37893A,SGM65231,74LVC2G08,SGM65232,SGM8969-2,SGM8969-1,SGM2035C,SGM7232,SGM9128YP,SGM41291,SGM2036S,74LVC1G32Q,74LVC2G14,SGM13001C,SGM13001B,SGM2581E,74LVC138,SGM8958-2,SGM41295,SGM13001A,SGM8958-1,SGM7222,SGM6132,SGM8554,SGM7223,SGM8555,SGM7224,SGM6130,SGM8556,SGM2581C,SGM7220,SGM2581A,SGM8551,SGM8552,SGM7226,SGM7227,SGM7228,SGM7229,SGM44599,SGM8581,SGM7SZ32,SGM8713A-1,SGM8582,SGM6613A,SGM8584,SGM41282C,SGM8714B-1,SGM8924A,SGM58XXX,SGM5355-16,SGM7SZ19,74LVC1G125,SGM89000,SGM811B,SGM7SZ14,SGM48752X,SGM431VB,SGM2560A,SGM37603,SGM2560B,SGM6611C,SGM810B,SGM7SZ08,SGM7SZ04,SGM8591,SGM7SZ00,SGM8592,SGM9203,SGM6612A,SGM8594,SGM8922A,SGM4T245,SGM48753,SGM48754,SGM48755,SGM48756,SGM48757,SGM813B,SGM48759,74AVC4T245,SGM8140,SGM8141,SGM48751,SGM449,SGMNQ07430,SGM48752,SGM48510,SGM458,SGM3785S,SGM459,SGM457,SGM8142,SGM452,SGM450,SGM451,SGM37862,SGM37861,SGM812B,74GTL2005,SGM447,SGM448,SGM446,SGM7SZ244,SGM8478-1C,SGM7SZ245,SGM8139,SGM48537,SGM48538,SGM48539,SGM5351-16,SGM2588G,74LVCN16373,SGM2588E,SGM61032A,SGM2588K,SGM61032B,SGM2588I,SGM3712,SGM2588C,SGM3713,SGM3710,SGM2588A,SGM3711,SGM48523,SGM48524,SGM48525,SGM48526,SGM48760,SGM48520,SGM8557-5,SGM71XX,SGM706B,SGM3700,SGM3727,SGM3741B,SGM3725,SGM3726,SGMOP07,SGM898,SGM899,SGM896,SGM897,SGM895,SGM61030A,SGM61030B,SGM2566B,SGM4823,SGM3735,SGM3732,SGM2566A,SGM4822,SGM3716,SGM3740B,SGM4806,SGM3717,SGM3714,SGM3715,SGM4809,SGM4807,SGM3718,SGM4808,SGM3719,74LVC157,SGM48780,SGM48540,SGM37898,SGM51652H,SGM3720,SGM37891,SGM4812,SGM37892,SGM2567A,SGM4810,SGM37895,SGM3749,SGM3747,SGM3748,74LVTH16244,SGM72204A,SGMNQ40430,SGM432,74AHCT86,SGM431,SGM3752,SGM3753,SGM3750,SGM3756,SGM3757,SGM3755,SGM3738,SGM4825,SGM3736,SGM4826,SGM7SZ86,SGM3851A,SGM8198,SGM3741,SGM660,SGM3740,SGM3743,SGM41562B,SGM724,SGM72112B,SGM5209-14,SGM72112A,SGM2200,SGM4863,SGM2202,SGM2201,SGM2204,SGM2203,SGM2206,SGM4865,SGM2205,SGM3758,SGM3759,SGM8416-4,SGM722,SGM723,SGM721,SGM3760,SGM72004B,SGMNM45412,SGM8295-2,SGM8295-4,SGM8480-2,SGM2523C,SGM2523D,SGM2523A,SGM8295-1,SGM2523B,SGM3766,SGM4040B,SGM790A,SGM330A,SGM790B,SGM790C,SGM41100A,SGM41100V,SGM41100W,SGM2220,SGM8262-2,SGM8416-1,SGM2221

2023/4/7 - SGMICRO - 选型指南代理服务技术支持现货查询批量订货

【选型】国产LED驱动芯片SGM3752可P2P替换SY7200A应用于温控器，最大输出电压达35V

温控器目前非常广泛的用在办公室，商场以及小家庭里面，可以很方便的控制中央空调。温控器是通过LCD面板来显示温度等相关信息的，LCD本身不会发光，要想让其显示所要的数据，需要使用白光背光源，白色背光源一般由数个发光白色LED灯组成，LED灯的个数由屏的尺寸大小决定，要使LED灯亮，还要使用LED驱动芯片。

2021-08-31 - 器件选型代理服务技术支持现货查询批量订货

【IC】圣邦微电子发布高效4路LED驱动器SGM37604S，支持3至5.5V工作电压范围

SGMICRO SGM37604S是一款高性能4路白光LED驱动IC，集成了1.2MHz升压转换器，支持3V至5.5V的工作电压范围。它能够高效驱动多达9串LED，每串LED的最大电流可达25mA，确保了高转换效率。该芯片采用自适应电流调节技术，能够适应不同LED串的电压，维持稳定的电流输出。

2024-11-29 - 产品代理服务技术支持现货查询批量订货

【应用】LED驱动芯片SGM3752应用于手持POS机，效率可达90%、最多可以实现10个LED串联

移动支付POS机是日常消费的支付方式之一，通常，POS机采用LCD显示屏详细显示消费信息，LCD本身不会发光，要想让其显示所要的数据，需要使用白光背光源，白色背光源一般由数个发光白色LED灯组成，LED灯的个数由屏的尺寸大小决定，要使LED灯亮，还要使用LED驱动芯片。在这里，选用的是圣邦微的SGM3752。SGM3752是一款高效率升压驱动器，效率可达90%。

2020-03-10 - 应用方案代理服务技术支持现货查询批量订货

【应用】效率高达90%的白光LED驱动器SGM3750用于相机闪光灯，稳定状态下占空比高达40％

某客户做了一款相机产品，需要一款白光LED驱动芯片来驱动LED，并且要求能够通过PWM进行亮度控制，控制LED亮度。客户选用的是圣邦微的白光LED驱动器SGM3750，可以通过芯片CTRL引脚使用PWM信号控制LED电流。

2022-11-27 - 应用方案代理服务技术支持现货查询批量订货

【选型】国产升压白光LED驱动器SGM3756YTDI6G/TR与AW9967DNR参数对比分析，可相互兼容

在现今芯片短缺形势下，为了预防采购问题导致的生产难题，有时需要对重点项目的元器件储备二供。本文对圣邦微升压白光LED驱动器SGM3756YTDI6G/TR与AW9967DNR做一个参数对比，说明两者兼容，为设计者提供参考。

2022-03-08 - 器件选型代理服务技术支持现货查询批量订货

【应用】LED驱动芯片SGM3758、SGM3759助力暗光自拍解决白光LED闪光灯色温不准、亮度不均难题

随着人们对手机拍照质量的需求不断增加，白光LED闪光灯色温不准、亮度不均等问题逐渐显露。圣邦微电子（SG Micro）推出LED驱动芯片SGM3758/SGM3759，5倍电流设计，惊人的屏闪照度，堪称业内最强；100us内稳定输出或关闭，闪光同步更完美！

2018-10-29 - 应用方案代理服务技术支持现货查询批量订货

SGM3127 White LED Driver with Low Dropout Current Source

型号- SGM3127YN6G/TR,SGM3127

JANUARY 2015 - SGMICRO - 数据手册 - REV. A. S 代理服务技术支持现货查询批量订货查看更多版本

【产品】内置MOSFET驱动的多功能LED驱动芯片,输出电流可达200Ma

圣邦微的SGM3758采用了40V集成开关MOSFET，是一款驱动白光LED的升压转换器。

2017-10-26 - 新产品代理服务技术支持现货查询批量订货

【产品】内置升压调节器的双通道WLED驱动器SGM3743，智能手机的理性选择

SGM3743是双通道WLED驱动器，它为单芯锂离子电池供电的智能手机背光灯提供高度集成的解决方案。芯片内置了高效的升压调节器，集成了1.5A/40V功率MOSFET并且支持低至3V的输入电压。同时芯片具有两路大电流接收调节器，可以驱动10S2P WLED，并且芯片升压输出可以自动调节WLED正向电压，允许非常低的电压余量控制，从而有效提高LED串联的效率。

2019-03-02 - 新产品代理服务技术支持现货查询批量订货

【应用】白光LED驱动芯片SGM3766用于洗碗机控制面板的背光LED，可在0.2%~100%范围内稳定调光

笔者设计的一款洗碗机控制面板，控制面板中部是一款3.7英寸的TFT液晶显示模组，该液晶显示模组的背光LED由圣邦微的高效率白光LED驱动芯片SGM3766驱动。SGM3766内嵌一颗40V/2.75A的MOSFET，因此可以驱动串联和并联各种组合的背光LED结构；支持PWM调光，PWM调光频率范围为10~100KHz，可在0.2%~100%范围内稳定调光。