欧美成人黄色网_欧美精品久久_国产在线一区二区三区_免费视频久久久_亚洲二区视频_欧美大片免费高清观看

產品分類

當前位置: 首頁 > 工業電氣產品 > 高低壓電器 > 熔斷器 > 低壓熔斷器

類型分類:
科普知識
數據分類:
低壓熔斷器

Simplify your isolated current and voltage sensing designs with single-supply isolated amplifiers and ADCs

發布日期:2023-10-04 點擊率:43

Other Parts Discussed in Post: AMC3301, AMC3301-Q1, AMC3302, AMC3306M25, AMC3330, AMC3330-Q1

It is necessary everywhere – to protect humans, provide noise immunity and handle ground potential differences between subsystems. You design for it in applications such as motor drives, solar inverters, DC charging (pile) stations, industrial robots, uninterruptible power supplies, traction inverters, onboard chargers and DC/DC converters.

I’m referring, of course, to galvanic isolation.

Systems, like the ones I mentioned above, require the transfer of current and voltage information from one power domain to the other over an isolation barrier for monitoring and control purposes. How do you transfer analog information over the isolation barrier? The answer lies in isolated amplifiers and isolated analog-to-digital converters (ADCs), the latter of which are also known as isolated delta-sigma modulators.

One key challenge when designing these systems is figuring out how to provide power supplies to the isolated amplifier or ADC. Traditionally, they need two power supplies: one on the high-side and one on the low-side (shown in the left image of Figure 1 as VDD1 and VDD2, respectively). The low side is often powered from the same supply that powers the digital controller, but many systems do not have a power supply readily available on the high side. This means that you’ll have to design a discrete isolated power supply on the high side (this will increase solution size, bill of materials [BOM] count and solution cost), which increases complexity in the design and printed circuit board (PCB) layout.

To address this design challenge, we developed a family of isolated amplifiers and ADCs that can operate using a single supply on the low side. Figure 1 shows the difference between standard isolated converters that need two power supplies (on the left) and the AMC3301 family, which can operate with single supply (on the right).

Schematic comparison showing the elimination of a high-side power supply in integrated an isolated amplifier.

Figure 1: Traditional isolated amplifier vs. isolated amplifier with a single supply

These new devices include a fully integrated DC/DC converter stage to generate the high-side supply internally. The architecture of this DC/DC converter is optimized to source as much as 1 mA of additional DC current from the high-side low-dropout regulator (LDO) output pin (usually denoted as HLDOOUT) for auxiliary circuitry, such as an active filter, a pre-amplifier or a comparator.


High accuracy for shunt-based current sensing.


Learn more about the AMC3301 precision reinforced-isolated amplifier with integrated DC/DC converter.

How a single-supply operation can simplify designs

The advantages of single-supply operation include:

  • A smaller solution size, reduced bill of materials (BOM) and lower system cost. An integrated DC/DC converter eliminates the need for discrete power supplies, such as a dedicated isolated power supply and the combination of dedicated transformer, transformer driver and LDO. This integration enables you to create compact system designs for space-constrained applications, and can help you reduce BOM count and lower system costs.
  • The opportunity to simplify your design and layout. Not having to worry about the availability of the high-side supply makes it easier to design high-accuracy shunt-based current and voltage sensing. You can:
    • Achieve higher reuse with a modular PCB design by eliminating the need for a centralized power supply.
    • Enable two-layer board designs with fewer traces and less power routing.
    • Remove design complexity when doing phase-to-phase voltage measurements in a multiphase system without a common neutral. You can eliminate discrete isolated power supplies that would otherwise be needed.
  • Flexibility in shunt placement. In traditional architectures, the existence of a power supply on the high side dictates the shunt placement, which may lead to parasitic effects. As an example, when using the gate-driver supply as the high-side supply, the shunt cannot always be placed close to the switch pin. This non-optimal placement may add parasitic inductance in series with the shunt, which causes common-mode disturbance at the input of the amplifier during the switching of the power stage, leading to inaccurate measurements. When using the AMC3301 family, because of the integrated power supply, the parasitic inductance does not impact the measurement accuracy.

TI’s portfolio

Figure 3 summarizes TI’s portfolio of isolated amplifiers and ADCs. The left side shows traditional devices that need dual supplies, and the right side shows the devices with single-supply operation.

Graphical visualization of TI's portfolio of isolated amplifiers and ADCs for current and voltage sensing, including automotive-qualified parts.

Figure 2: TI’s portfolio of isolated amplifiers and modulators (ADCs)

 Below are all of the options in the AMC3301 family, based on the application.

 For current sensing:

  • AMC3301: ±250-mV input reinforced isolated amplifier.
  • AMC3301-Q1: Automotive Electronics Council (AEC)-Q100-qualified ±250-mV input reinforced isolated amplifier.
  • AMC3302: ±50-mV input reinforced isolated amplifier.
  • AMC3306M25: ±250-mV input reinforced isolated modulator (ADC).

 For voltage sensing:

  • AMC3330: ±1-V input reinforced isolated amplifier.
  • AMC3330-Q1: AEC-Q100-qualified ±1-V input reinforced isolated amplifier.

It is possible to have both a simplified design and a compact form factor without compromising performance. When you are ready to start designing, TI’s applications experts are here to answer any questions you may have in the TI E2E? support forums. In the meantime, check out the additional resources below to boost your knowledge on isolated amplifiers and ADCs.

Additional resources

  • Learn more about isolated amplifiers and modulators in our video training series.
  • Read these white papers:
    • “High-Voltage Isolation Quality and Reliability for AMC130x.”
    • “Comparing Isolated Amplifiers and Isolated Modulators.”
    • “Comparing Shunt- and Hall-Based Current-Sensing Solutions in Onboard Chargers and DC/DC Converters.”
  • Read the application brief, Accuracy Comparison of Isolated Shunt and Closed-Loop Current Sensing.

下一篇: 半導體封裝設備有哪些

上一篇: How integrated brush

主站蜘蛛池模板: 操一操| 成年人电影免费在线观看 | 亚洲精品无码成人片久久 | 一区毛片| 国产亚洲精品久久久久久 | 成人永久免费高清 | 欧美日韩一区二区三区在线观看 | 四虎影视永久在线精品 | 蜜臀av在线观看 | 欧美日韩精品一区二区三区视频 | 三年片免费观看大全国语 | 99久久精品国产一区二区蜜芽 | 亚洲永久精品ww47 | 欧美太黄太色视频在线观看 | 色狠狠网| 中文国产成人精品久久一 | 亚洲午夜未满十八勿入网站2 | 亚洲日韩精品a∨片无码加勒比 | 亚洲a成人7777777久久 | 精品国产成人综合久久小说 | 亚洲久久草 | 国产成熟妇女性视频电影 | 国产精品青青青高清在线观看 | 国产精品三级在线播放 | 人妻精品久久久久中文字幕 | 可以直接看的无码av | 亚洲99爱| 成人羞羞视频在线观看男生 | 国产成人无码一区二区三区在线 | 日韩国产 | 无码精品不卡一区二区三区 | 国产成人黄网址在线视频 | 最新亚洲精品国自产在线 | 日韩无砖专区体验区 | 国产精品一区二区在线播放 | 国产三级在线观看视频不卡 | 亚洲在线视频免费 | 国产成人艳妇aa视频在线 | 亚洲在线一区 | 国产综合久久久久久鬼色 | 国产精品无码一区二区三区在 |