隔离论坛 - 最近的话题

ISO6041: 请问ISO6041LDWR芯片隔离SPI的工作机制

Abner Ma — Wed, 29 Jul 2026 09:06:16 GMT

Part Number: ISO6041

你好，

ISO6041LDWR，这款芯片隔离25Mhz时钟的SPI通讯，有以下几个问题需要咨询：

1.为什么芯片的通讯速率是200Mbps，但在3.3V电压下，SPI时钟最高只能到25MHz？

2.SPI隔离后，如何保证SPI信号的时钟、数据、片选的时序统一？靠的是芯片内部的时序重整，还是仅靠隔离的低延时去“硬扛”？

3.SPI时钟大于25MHz后，例如30M，50M等，会出现什么问题？

感谢。

ISO7741: 【选型求助】请问TI是否有专门的SPI隔离器件？

Abner Ma — Wed, 29 Jul 2026 02:13:24 GMT

Part Number: ISO7741
Other Parts Discussed in Thread: ADS7038H

工程师你好，

我们项目上，目前需要隔离ADS7038H的SPI接口，我们的SPI时钟设置为50MHz，目前需要帮忙选型SPI的隔离器件。要求如下：

1.不需要内置隔离电源

2.支持50MHz的SPI时钟

3.4个通道隔离后，各通道的时延偏差要统一

4.隔离耐压不低于3.75kv

另，请问TI若有针对SPI优化的隔离芯片，技术上是怎么做到隔离后时序统一的呢？

TINA-TI_SIMP_CHINESE: 缺少模型

SK R — Tue, 14 Jul 2026 09:00:09 GMT

Part Number: TINA-TI
Other Parts Discussed in Thread: ISO124, ISO224, ISO120

没有ISO124的仿真模型

TINA-TI_SIMP_CHINESE: 缺少模型

SK R — Tue, 14 Jul 2026 08:59:04 GMT

Part Number: TINA-TI
Other Parts Discussed in Thread: ISO124

没有ISO124的仿真模型

UCC14241-Q1: Why does COM-VEE use two different hysteresis windows (wide and narrow)? Can the narrow window be used alone for lower ripple?

Jiang Luo — Thu, 09 Jul 2026 15:23:50 GMT

Part Number: UCC14241-Q1

Hello TI E2E Experts,

My team is currently in the component selection phase for a new project, and we are strongly considering the UCC14241-Q1 for our application.

Our use case is a bipolar amplifier power supply, where low output voltage ripple on both the positive and negative rails is critical for maintaining signal integrity. While reviewing the device specifications to ensure it matches our system requirements, I noticed that the COM-VEE regulator utilizes two different hysteresis windows — one wide (±20 mV) and one narrow (~1.25 mV) — as shown in the datasheet (Figure 8-2, SLUSF09).

I have the following technical questions:

1. What is the design intent behind using two distinct hysteresis windows for the charge and discharge paths? How does this dual-window approach solve practical problems in the application?

2. Is the wide window (±20 mV) primarily intended for startup and large-signal transient response, while the narrow window (~1.25 mV) handles fine regulation during steady-state operation? Or do they serve a different purpose?

3. For our bipolar amplifier application, where ripple minimization is the top priority, would it be possible to configure the device to use only the narrow hysteresis window (~1.25 mV) for both charge and discharge? If so, what external configuration (e.g., RLIM/RDR network values, capacitor selection, or other pin settings) would be required to achieve this?

4. If the dual-window architecture is fixed and cannot be altered, what practical measures can we take to minimize the COM-VEE output ripple in steady-state operation? For example, would increasing COUT3, optimizing the FBVEE divider, or adjusting RLIM values help reduce the ripple amplitude?

Any technical insights or application guidance would be greatly appreciated.

Best regards,

Luo Jiang

ISO7641FM: 只有输入没有输出

Yicheng Wang — Wed, 08 Jul 2026 04:36:43 GMT

Part Number: ISO7641FM

11角有信号输入，那个6角要有信号输出。但是我们现在测了这11角有信信号输入，6角没有信号输出，所以它都没输出。

ISO1042: Do TI have the chip to isolate CAN_H and CAN_L?

Zhanke Zhao — Sun, 21 Jun 2026 01:37:23 GMT

Part Number: ISO1042

As we know, ISO1042 us a chip to isolate between can_tx can_rx and can_h can_l.

Now we want isolate can_h and can_l directly.

Do TI have the chip to isolate CAN_H and CAN_L?

Now out problem is below:

We have only one can controller,so we only connect one can transceiver at can controller by can_tx and can_rx. Now we need connect two device at can transceiver by can_h and can can_l, and two devices,can transceiver should be isoltated each other.

So we need the chip to isolate can_h and can_l.

TIDA-00785: 使用tida-00785这个驱动出现问题

?? ? — Fri, 19 Jun 2026 07:20:18 GMT

Part Number: TIDA-00785

我在使用tida-00785这个驱动方案时出现问题，图中绿色的是驱动GaN的Gs电压即Vgs,关断时不是零电压

TXB0104-Q1: 关于使用TXB0104 输出信号高电平拉不高

Larson Lu — Fri, 12 Jun 2026 10:41:30 GMT

Part Number: TXB0104-Q1

问题描述：

1、信号从1V8到3V3。其中一个channel加了3v3上拉10K电阻。

2、测量B和C点的电压波形发现：1、电压无法拉低--原因已经清楚，由于4.5K和上拉10K分压导致。2、波形中红框部分C点的电压无法拉高，可以看到此时B点的电压是拉高的，但是B点的电压有点毛刺

疑问点：

针对下面测量波形，红框标记的位置

1、为什么B点电压拉高到1V8的时候，C点电压会被拉到1V5，而不是3V3（目前怀疑是跟反相器过流保护相关）

2、为什么B点的电压出现很多杂波脉冲（怀疑跟内部的one shot有关系）

图一：

图二：

ISO1450: ISO1450BDWR 当D电平为1.8V时差分出来的Y信号没有发生电平变化，Z电平为3.3V 。Y的信号发生故障

星瑞天辰 — Wed, 13 May 2026 12:58:16 GMT

Part Number: ISO1450

你好，当我使用ISO1450BDWR 给D发送一共电平为1.8V的逻辑电平时差分出来的Y信号电平未出现明显变化，在示波器上仅能看到400mV的微小电平一闪而过，Z电平能正常变为3.3V 。Y的信号发生故障，故障图像如上图所显示。当更换芯片为ISO1452BDWR 则，能看见 Y 和Z 的电平都能正常跳变成3.3V。我取消了R110 R94 R119 和ESD也是同样的故障。请问是器件使用方法不对？

UCC28C44: UCC28C44测试不通过的问题

YANNI CAI — Wed, 13 May 2026 03:21:22 GMT

Part Number: UCC28C44

UCC28C44这个型号我们在二次筛选的过程中旧资料VOH下限是5V，典型值是6.8V，VCOMP给5V是可以测拉电流的，新资料VOH下限是VREF-0.2V，大概是4.8V，测试结果一直不对。请给与技术支持，谢谢！

UCC33410: UCC33410的IEC60747-17的认证

zi wang — Thu, 30 Apr 2026 02:51:33 GMT

Part Number: UCC33410

1.UCC33410的规格书上标注，计划过IEC60747-17 (VDE 0884-17)的认证。这个认证处于
什么状态?是否已经通过?
Planned Safety-related certifications:
Basic isolation per DIN EN IEC 60747-17 (VDE0884-17)
2.TI是否有其他功能类似的DCDC隔离电源通过了IEC60747-17 (VDE 0884-17)的认证推
荐?

ISO1410: ISO1410DWR

peter zhou — Fri, 24 Apr 2026 12:11:45 GMT

Part Number: ISO1410

For ISO1410DWR A and B pin，which signa si RS485 bus Positive signal, negative signal，any documents introduce about this？

SN74LVC1T45: SN74LVC1T45芯片的输出口上升下降沿出现振铃

he he — Mon, 20 Apr 2026 09:18:20 GMT

Part Number: SN74LVC1T45

芯片的输出口上升下降沿出现振铃

LM5155: On the Making of Transformers

wang liu — Mon, 23 Mar 2026 06:50:39 GMT

Part Number: LM5155

HI,

I'm using the LM5155 to design a circuit with a 5V input and a 12V 3A output. However, I have no idea how to design the transformer. Here is my schematic diagram. Could you provide the winding number so that I can also apply for a custom transformer? I hope it can help me solve the problem.

Thanks in advance

kind regards

liu

ISO1044: 信号通过ISO1044后CAN总线错误无法使用

dang HU — Fri, 06 Mar 2026 03:11:57 GMT

Part Number: ISO1044

信号通过ISO1044后CAN总线错误无法使用

ISO3082: ISO3082 终端电阻放置的位置问题

yunfei chen — Sat, 28 Feb 2026 07:58:40 GMT

Part Number: ISO3082

如下面两张图，当120欧姆终端电阻放置在IC端时，接收到的RS485数据正常。当120欧姆终端电阻放置在输出端时，接收到的RS485数据不正常，数据长度少且乱码。

请问从芯片使用上来说，120欧姆终端电阻应该放置在哪个位置？若应该放置在输出端，我的原理图设计存在什么问题？要怎么修改？

ISOW7741: ISOW7741 as a power source

CC CHU — Fri, 23 Jan 2026 23:48:57 GMT

Part Number: ISOW7741
Other Parts Discussed in Thread: ISO7740,

Hello,teams

Does ISOW7741 supply power to another ISO7740? Is it feasible?

ISOW7741: Can isow7741 be cascaded?

CC CHU — Wed, 21 Jan 2026 10:31:51 GMT

Part Number: ISOW7741

Hi team,

Can isow7741 be cascaded?

one chip Visout pin connect to another chip Vio pin.

ISO1042: ISO1042BDWVR 关于测试电路解读

?? ? — Tue, 06 Jan 2026 07:53:50 GMT

图中VI电压波形，LOW=1.5V,HIGH=3.5V 是怎么产生的了？

ISO1042: ISO1042BDWVR 信号一致性测试-参数解读

?? ? — Mon, 05 Jan 2026 08:51:43 GMT

Part Number: ISO1042

TI_ISO1042BDWVR.pdf

Q1: 下图中的VI 是指VCANH 还是Vdiff(canh-canl)?

Q2:右图中VI的电压波形，1.5V~3.5V，跟单独的VCAN电平（VCANH 显性电平2.75V~4.5V，隐性电平2.0V~3.0V）不匹配；和Vdiff（Vdiff 显性电平1.5V~3.0V,隐性电平-120mV~12mV）也不匹配；请问这里的1.5V/3.5V 到底是什么电压？怎么来的？

LMG3411R070: 逆变母线电压上到300V之后器件工作不正常

xuhao ye — Fri, 26 Dec 2025 07:16:53 GMT

Part Number: LMG3411R070

逆变母线电压上升到300V之后上管就处于一直开通的状态，下管处于一直关闭的状态，控制信号输入正常，这是为什么，是我Layout的问题吗

ISO1050: ISO1050单独通信没有问题，加入到CAN总线后通信异常

HR.Zhu — Tue, 16 Dec 2025 15:41:23 GMT

Part Number: ISO1050

ISO1050单独通信没有问题，加入到CAN总线后，它之后的CAN节点都不能正常通信，把它放入CAN总线最后节点，其他节点通信正常，它不能正常通信！

ISOM8710: ISOM8710的输入电流多大才能使输出为低电平？

GE BAOSHAN — Thu, 04 Dec 2025 03:25:06 GMT

Part Number: ISOM8710

datasheet中，If（on)最小为2mA，但图7-3所示，为输入前向电流为1mA时输出低电平。到底以哪个为准？

ISOW7842: VISO输出纹波异常

B A — Mon, 17 Nov 2025 08:28:55 GMT

Part Number: ISOW7842

TI团队您好！

我重新设计了一个原理图，隔离部分全部由ISOW7842的VISO供电。目前的情况是，开启隔离端负载-3V3升压24V电路后，芯片有明显嗡嗡声，VISO输出电压纹波如下：

而关闭VISO负载（升压电路）后，纹波正常。

这是否是隔离端总电流超过了75mA，导致VISO输出能力不足？