升压芯片及其转换效率

1、透明屏接口用升压芯片及其转换效率研究:经多方搜集适用的升压芯片资源信息，已获取LM2733、PT1305、KTC218、MP1541、CP2121、RT9284A等六个型号的样片供测试对比，下面列出其初步测试情况。下表中的数据都是基于特制试验电路板的测试结果，该试验板全部采用适于手机应用的元件，尺寸较 小，功率裕量也不大；测试仪表主要是普通数字万用表，在某些情况下，虽然做了许多努力以便尽量获得 正确的测量方法和步骤，但由于VCC/Ivcc/lvbat等三个参数只能依次进行测量，并且串入电流表对升压电路的工作状态肯定会有影响一一有时甚至影响很严重导致无法测量（MP1541尤甚），所以不能保证每次

2、测量都绝对准确，表中的记录或计算值仅供参考。另外，还有新推荐的CP2121/MP1542DK尚未测试。为达到精确测量的目的，后期特别采用了Agilent66319电源单独为升压电路供电，而手机用锂电池块或其它电源另行供电，构成测试电路如下图。图中V1、mA1为电源本身的仪表读数，V2、mA2为普通数字万用表（同时用两个表）。该方式所得数据应是基本准确的。Afiilent 66519经反复试验和测试得知，升压电感的感值大小及额定功率等参数对转换效率及升压电路的稳定工作密切相关。但是，因手机的堆叠尺寸所限，无法选用较大功率和感值的元件，所以电路的转换效率始终受到限制，在目前状态下，至多能达到85%

3、左右。下述测试数据中，效率稍高的是PT1305/负载为KOLON屏的情况（绿色数字）。更多的试验数据有待进一步研究获取。IC PNParameterNO SIMIM1IM2IM3IM4IM5IM6IM7IM8Comme nt1、电路构成 PT1305/LQH3NPN220NG0L/RB551V -30TE/PT1305(TDK)普通屏VCC(V)17.8617.9017.8217.8317.8417.8617.8717.6817.67IVCC大于30 mA 时，电感严重 发烫。IVCC(mA)18326263117203337IVbat(mA)11318173161187100121215 ！

4、249！Efficie ncy74.8778.5170.4875.7777.8379.977.7371.4169.1注：当电流超过30mA电感发烫时，Ivcc会缓慢升高到50mA以上，若仍不关断电源，电感会冒烟，有烧糊味。2、电路构成 PT1305/SWPA3010S100MT/0.58A /RB551V -30TE/PT1305(TDK)高亮屏VCC(V)17.8117.8817.6517.8017.8117.8517.8517.6217.65经10分钟大电流考 验，无电感 发烫现象。IVCC(mA)18.183.0526.0525.2829.1017.1621.1531.4534.10IV

5、bat(mA)11519165159183104128198218Efficie ncy74.0975.5373.3374.4874.5377.5177.6273.6572.653、电路构成 PT1305/SWPA3010S100MT/0.58A /RB551V -30TE/PT1305(KOLON)VCC(V)17.8217.8817.7017.7317.7417.8417.8017.7317.74经10分钟大电流考 验，无电感 发烫现象。IVCC(mA)15.504.9526.1031.0032.5019.3025.5529.6031.00IVbat(mA)104.652815817218

6、6107138169180Efficie ncy69.4683.1876.9484.0981.5784.6886.7381.7280.4LM2733(TDK)高亮屏(普软件)VCC(V)18.1618.1917.8718.1318.1518.1618.1617.8517.80IVCC大于25mA，电感发烫。IVCC(mA)18.353.0826.1525.7229.6517.3821.3331.8334.75IVbat(mA)14423216203236119150265296！Efficie ncy60.9064.1056.9360.4560.0169.8067.9656.4254.99LQ

7、H3NPN220NG0LMP1541(TDK)普通屏VCC(V)16.8616.8416.8716.8716.8616.8616.8616.8716.85IVCC大于20mA 时，电感急剧升温IVCC(mA)17.782.9225.7125.2629.6217.0020.5532.0935.25IVbat(mA)921912912313991107153163！Efficie ncy85.7568.1188.4891.1794.5582.8985.2193.1195.89注：在升压芯片的 Vbat端串入电流表对电路工作有影响，上述测量结果不太准确。MP1541(TDK)高亮屏VCC(V)17.

8、8718.0217.8217.7817.7017.9517.8717.7517.68IVCC(mA)18.243.0526.3525.3229.0017.2521.1532.0034.42IVbat(mA)11822173165185114138210221Efficie ncy72.6965.7471.4371.8073.0271.4872.0771.1872.46LQH3NPN220NG0LMP1541(KOLON)VCC(V)16.8616.8416.8616.8216.8416.8616.8516.8516.82IVCC大于 25mA 时，电感22uH急剧发烫。IVCC(mA)14.5

9、54.8824.7530.0631.2218.4824.7828.6129.95IVbat(mA)7830118160162105132151158Efficie ncy82.7672.0993.0683.1685.4078.0983.2484.0283.90SWPA3010S100MT/0.58AMP1541(KOLON)VCC(V)16.2816.6316.1016.0015.9616.8816.9016.9016.90测VCC电流时，负载较大VCC显著下降IVCC(mA)12.594.6721.3227.7528.6?16.8822.8526.1226.95IVbat(mA)6521.6

10、104.2133135VBAT接电池块时VCC正常，但是IVbat暂无法测量Efficie ncy82.9895.7590.9986.6988.98电源内阻影响VCC输出电压SWPA3010S100MT/0.58AKTC218(KOLON)VCC(V)17.3117.3117.2917.2517.2517.2617.2617.2617.25IVCC(mA)14.814.8825.1030.4631.6218.7225.0028.9830.1IVbat(mA)9031150182189111150173180Efficie ncy74.9671.7176.1475.9776.0276.6075.

11、7076.0975.91LQH3NPN220NG0LKTC218(TDK)普通屏VCC(V)17.2817.3317.2417.2417.2317.2417.2417.2317.23IVCC 大于 25mA时，升压电 感有发热。IVCC(mA)15.254.9325.7230.5831.8818.8525.1829.1830.35IVbat(mA)11129151187182103141167178Efficie ncy62.4877.5377.2874.1979.4283.0381.0279.2377.31LQH3NPN220NG0LMP1541(KOLON)VCC(V)16.8616.83

12、16.8716.8616.8716.8716.8716.8716.84IVCC 渐近 30mA时，电感急剧发烫。IVCC(mA)14.714.8525.0530.0231.3218.5624.7728.6529.72iVbat(mA)8132125163164107138155163Efficie ncy80.5867.1388.9781.7184.7877.0179.6982.0680.80万用表串入升压板的 Vbat回路测量电流时对芯片工作有影响，上述数据不太准确。LM2733 (VCC(V)15.2515.2815.2615.2515.2515.2615.2515.2515.25新换KO

13、LON)IVCC(mA)14.184.0623.821.723.413.721.224.524.3FPC与TDK 一 致 0426iVbat(mA)82.148.2144133140.594.3129.5146146Efficie ncy69.3133.8766.3765.4866.8458.3465.7067.3466.79手机未插SIM卡，关闭屏蔽室门、VCC为16.5V时播放T卡中视频，整机电流（采样积分）约为180-200毫安，最大电流为542.9毫安。注：联想的样机（VCC为16.5V,TDK普通屏）播放同样的视频文件的整机电流为200-240毫安，最大860.9毫安。PT1305(

14、KOLON)VCC(V)16.47516.516.4516.4616.4816.4916.4816.4716.48新换FPC与TDK 一 致 0426IVCC(mA)14.74.1524.822.3241421.725.3725.2IVbat(mA)90.84716314615599.5142163.2162Efficie ncy70.238.365.8666.1667.1561.0666.2767.3866.79KTC218 -DEMO 仃DK) 高亮屏VCC(V)17.1117.0217.0716.9816.9517.0016.9816.9316.95DEMO 板所用电感和二极管体积过大I

15、VCC(mA)17.623.0325.3224.3627.7016.4020.6330.4032.50IVbat(mA)90.516.8130124.5141.584105.4155167Efficie ncy87.6680.7887.4987.4387.3287.3487.4687.3886.81LM2733(TDK)普通屏VCC(V)18.1818.2018.1718.1718.1618.1718.1718.1618.14IVCC大于30mA，电感发烫。IVCC(mA)18.052.9225.9525.9230.3017.2020.7533.1037.4 ！IVbat(mA)11320.4

16、177162190102125219261！Efficie ncy76.4268.5670.1076.5176.2180.6379.3772.2368.40RT9284A(TDK)高亮屏VCC(V)17.4817.7317.1617.3717.2817.617.5517.116.85IVCC(mA)17.863.0324.224.5227.816.7520.829.831.6IVbat(mA)12722175176201115147216228Efficie ncy64.6964.2662.4563.6862.8967.4665.3562.0861.46SWPA3010S100MT/0.58A

17、LM2733(KOLON)VCC(V)18.1718.2018.1618.1418.1618.1618.1718.1618.15经10分钟大电流考 验，无电感 发烫现象。IVCC(mA)15.954.9527.2231.3833.0019.5825.7530.0831.42IVbat(mA)11335202232236130180221228Efficie ncy67.4967.7464.4064.5766.8271.9868.4065.0565.82KTC218(TDK)高亮屏VCC(V)17.417.317.2817.2017.2017.2317.2117.2217.21IVCC(mA)17.753.0325.8024.6528.1516.6520.8031.0533.15IVbat(mA)102.519.2149142.516296.5120179191Efficie ncy79.2971.8578.7478.3078.6578.2378.5078.6178.61根据前期的试验和测试结果，可以初步确定器件选型为一一PT1305/KTC218、LQ