随笔分类 - Circuit
摘要：2nd order RC Low-pass FilterCenter frequency fc = 23405.13869[Hz]Q factor Q = 0.333333333333Sallen–Key topologyhttp://en.wikipedia.org/wiki/Sa...
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posted @ 2014-03-23 21:23
IAmAProgrammer
摘要：http://www.baiheee.com/Documents/081207/081207184434.htmhttp://www.baiheee.com/Documents/081207/081207184704.htm当要显示绿灯（LED1）亮时，I/O口可置为低电平。此时红灯（LED2）反向偏置，无电流流过，不会亮。当要显示红灯（LED2）亮时，I/O口可置为高电平。此时绿灯（LED1）反向偏置，无电流流过，不会亮。若要指示灯不亮，可将I/O口置为高阻态，此时两个发光管均无电流流过，也不会亮。若要显示橙灯亮时，此时LED1、LED2要一起亮，则可以让I/O口在某一固定频率下以50%的占
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posted @ 2014-02-26 01:09
IAmAProgrammer
摘要：The TPS54331 is a 28-V, 3-A non-synchronous buck converter that integrates a low RDS(on)high side MOSFET. To increase efficiency at light loads, a pulse skipping Eco-mode™ feature is automatically activated. Furthermore, the 1 µA shutdown supply current allows the device to be used in battery p
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posted @ 2013-09-17 23:18
IAmAProgrammer
摘要：http://electronicdesign.com/digital-ics/digital-current-mode-control-challenges-analog-counterpartsDigital Current-Mode Control Challenges Analog CounterpartsElectronic DesignBryan KrisThu, 2006-11-16 (All day)Switch-mode power supplies can use digital current-mode techniques for protection against
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posted @ 2013-09-10 15:52
IAmAProgrammer
摘要：http://www.analog.com/zh/content/dc-to-dc_switching_regulator_insights/fca.html作者：Sridhar Gurram，Oliver Brennan，Tim Wilkerson引言长期以来，设计师一直面临着使MP3播放器、个人媒体播放器、数码相机和其它便携式消费电子设备满足高性能和低功耗的艰巨挑战。这些电池供电系统通常使用嵌入式数字信号处理器(DSP)，以便在处理多媒体应用时提供最大的处理能力，在睡眠模式时达到最小的功耗。电池寿命是手持式电池供电产品的首要指标，因此这些产品的成功与否与电源系统的效率直接相关。DC/DC降
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posted @ 2013-09-10 14:47
IAmAProgrammer
摘要：【TI博客大赛】【原创】LM3S811之基于PWM的DAChttp://bbs.ednchina.com/BLOG_ARTICLE_3005301.HTMhttp://www.fpga4fun.com/PWM_DAC_3.htmlOne-bit DACTake one pin of an FPGA, connect a speaker and listen to an MP3? Easy.Here, we'll use a PC to decode an MP3, and then send the decoded data to an FPGA that is configured
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posted @ 2013-09-10 14:06
IAmAProgrammer
摘要：第二版STM32 + RA8875 + AT070TN92 + 触摸屏 + USB + C++...http://www.amobbs.com/thread-5510972-1-1.html
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posted @ 2013-09-09 22:24
IAmAProgrammer
摘要：
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posted @ 2013-09-09 14:55
IAmAProgrammer
摘要：http://www.ti.com/lit/an/slva299a/slva299a.pdfMany boost converters have an external rectifier diode.The input voltage of the TPS61170 main boostconve...
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posted @ 2013-09-09 14:52
IAmAProgrammer
摘要：Variable Control Voltage Output Voltage AdjustThis method is accomplished by connecting a variable control voltage througha resistor, R(adjust), to J3−1. The equations provided below calculate R2 andR(adjust) where:For example, if VO,max= 19 V, VO,min = 17 V, V(adjust),min = 0 V, V(adjust),max =3.3
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posted @ 2013-09-09 00:28
IAmAProgrammer
摘要：
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posted @ 2013-09-05 20:45
IAmAProgrammer
摘要：Single Inductor Buck-Boost Converter in Tiny WCSPThe TPS63036 is a non inverting buck-boost converter able to provide a regulated output voltage from an input supply that can be higher or lower than the output voltage. The buck-boost converter is based on a fixed frequency, pulse-width-modulation (P
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posted @ 2013-09-03 16:55
IAmAProgrammer
摘要：http://www.amobbs.com/forum.php?mod=viewthread&tid=3661385&page=3#pid3803226对R13 R16 R17做星-三角变换：RAB = R13 + R17 + R13 * R17 / R16 = 4.63KRBC = R16 + R17 + R16 * R17 / R13 = 14.03KRCA = R13 + R16 + R13 * R16 / R17 = 46.3K变换后RAB固定接于5V和地之间，可忽略。Vpwm变化范围0-5V，根据虚短原理，C点电压变化范围也是0-5V。现在问题变成：A = 5V，B
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posted @ 2013-08-28 07:37
IAmAProgrammer
摘要：http://electronicdesign.com/power/simple-addition-permits-voltage-control-dc-dc-converters-outputIn a standard dc-dc converter, a resistor divider typically defines a fixed output voltage. However, applications like programmable output voltage power supplies and motor control circuits require dynami
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posted @ 2013-08-27 14:28
IAmAProgrammer
摘要：http://electronicdesign.com/print/passives/fixed-dc-dc-regulator-output-uses-digitally-controlled-potentiometerElectronic DesignTamara SchmitzThu, 2009-10-01 (All day)Digitally controlled potentiometers (DCPs) have become very popular in a wide variety of applications, including control, parameter a
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posted @ 2013-08-27 14:19
IAmAProgrammer
摘要：DIGITALLY ADJUSTABLE BOOST CONVERTERThe TPS61045 is a high frequency boost converter with digitally programmable output voltage and true shutdown. During shutdown, the output is disconnected from the input by opening the internal input switch. This allows a controlled power up/down sequencing of the
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posted @ 2013-08-25 21:06
IAmAProgrammer
摘要：http://www.powerguru.org/changing-the-output-voltage-of-a-switching-regulator-on-the-fly/There are many different ways to change the output voltageApplications that require the output voltage of a power supply to change dynamically come from a wide variety of areas. Examples are sensor applications
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posted @ 2013-08-25 19:31
IAmAProgrammer
摘要：As shown in figure 3.4, PWM controller contains two main parts;voltage error-amplifier and voltage comparator. The error-amplifier compares the feedback voltage VF (applied to inverting input) to reference voltage VREF (applied to non-inverting input) then their difference which is called voltage er
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posted @ 2013-08-25 19:26
IAmAProgrammer
摘要：GENERAL DESCRIPTION The AX5511 is a current mode step up converter intended for small, low powerapplications. The converter input voltage ranging from 2.6V to 5.5V. The Output voltage can be set up to 27V. The frequency is 1.2MHz allows the use of small external inductors and capacitors and provides
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posted @ 2013-08-25 19:07
IAmAProgrammer
摘要：http://www.edn.com/design/analog/4363990/Control-an-LM317T-with-a-PWM-signalThe LM317T from NationalSemiconductor is a popular adjustable-voltageregulator thatprovides output voltagesof 1.25 to 37V with maximum 1.5Acurrent. You can adjust the outputvoltagewith a potentiometer. The circuit inFigure 1
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posted @ 2013-08-25 18:53
IAmAProgrammer
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