https://e2echina.ti.com/support/tools/sim-hw-system-design/zh-CNTelligent Community 13https://e2echina.ti.com/support/tools/sim-hw-system-design/f/simulation-hardware-system-design-tools-forum/1072115/lm3481-lm3481-dr/3860296Wed, 06 May 2026 04:19:00 GMT91561404-af28-475a-b96b-cb6cbaadd097:50b7c7f1-5654-433f-a541-10cf179b1ba4Alice您好， 根据R44电阻值，频率稍微低了（47.02KΩ对应417KHZ）。 duty cycle请参考 数据手册 Equation 43 计算 根据数据手册，DR引脚的额定电压最低可支持 -0.4V，最高可 支持 7V。 然而，由于这是一个输出引脚，因此驱动器不太可能输出会损坏自身的信号。 根据布局和设计的功率水平，这也可能是接地电平上的噪声注入到测量中。 如果您担心负向过冲，可以添加门极电阻来减慢信号，同时减少过冲。 芯片产品网页 上提供了计算工具，建议使用“LM3481-SEPIC-CALC — LM3481 quick start calculator for SEPIC”工具辅助设计。https://e2echina.ti.com/support/tools/sim-hw-system-design/f/simulation-hardware-system-design-tools-forum/1072115/lm3481-lm3481-drWed, 06 May 2026 03:14:00 GMT91561404-af28-475a-b96b-cb6cbaadd097:76e25f95-d02e-49f5-a329-29fbd488eaeawenbo zhaoPart Number: LM3481LM3481车身电子装置与照明https://e2echina.ti.com/support/tools/sim-hw-system-design/f/simulation-hardware-system-design-tools-forum/1071910/ucc256404-simulation-issues-with-ucc256404-and-ucc28056/3859408Tue, 05 May 2026 08:58:00 GMT91561404-af28-475a-b96b-cb6cbaadd097:c2623b63-1bed-46a8-97da-41a12f62635cEirwenHello, we have received your case and the investigation will take some time. Thank you for your patience.https://e2echina.ti.com/support/tools/sim-hw-system-design/f/simulation-hardware-system-design-tools-forum/1071910/ucc256404-simulation-issues-with-ucc256404-and-ucc28056Tue, 05 May 2026 07:50:00 GMT91561404-af28-475a-b96b-cb6cbaadd097:51c9206b-e56b-47a4-8c95-289c242f4cb4XX WPart Number: UCC256404 Other Parts Discussed in Thread: UCC24624 , UCC28056 Dear TI Technical Support Team, Hello! I am currently designing a half-bridge LLC resonant converter using the UCC256404B controller, the UCC28056B PFC controller, and the UCC24624 synchronous rectifier driver. During simulation and design, I have encountered several critical issues and would greatly appreciate your professional guidance. First, regarding MOSFET current and voltage spikes at startup: In simulation, when using MOSFET models, I observed large current and voltage spikes on the primary-side MOSFETs at the moment of startup. Adding a small amount of parasitic inductance does not eliminate these spikes. After reviewing relevant materials, I suspect the issue is caused by the MOSFETs' initial parasitic capacitance being zero and hard switching. Is there a solution for this? Second, regarding soft start and output voltage overshoot: I am facing a dilemma with the soft start implementation. Increasing the soft start capacitor value to slow down the voltage ramp‑up causes severe output voltage overshoot. Adjusting the feedback loop parameters to suppress the overshoot then introduces loop stability problems. Is there a way to solve both issues simultaneously? Third, regarding the UCC28056 startup issue: Sometimes, due to a small voltage difference during startup, the UCC28056 enters CCM mode, which creates an inductor current spike. How can this problem be resolved? Fourth, regarding integrated simulation of multi‑controller designs: My design uses three separate ICs (UCC256404B, UCC28056B, UCC24624), each with its own simulation model. I would like to simulate the complete system in the same environment to verify end‑to‑end performance. Is it possible to place the three model files into the same project? If so, how should I do it? Thank you for your time and support. I look forward to your reply. Best regards,UCC24624UCC256404UCC28056https://e2echina.ti.com/support/tools/sim-hw-system-design/f/simulation-hardware-system-design-tools-forum/1071763/tina-ti_simp_chinese-uaf42-50hz/3859314Mon, 04 May 2026 22:48:00 GMT91561404-af28-475a-b96b-cb6cbaadd097:40dbc47c-a1cf-4f88-a88e-59ada51024d0Taylor您好， 已经收到了您的案例，调查需要些时间，感谢您的耐心等待。https://e2echina.ti.com/support/tools/sim-hw-system-design/f/simulation-hardware-system-design-tools-forum/1071763/tina-ti_simp_chinese-uaf42-50hzMon, 04 May 2026 13:44:00 GMT91561404-af28-475a-b96b-cb6cbaadd097:7b41922d-bc90-429d-b893-fadc73cc7c58xh zPart Number: TINA-TI 求问各位大佬为什么，图片中能看到中心频率在40hz，但是傅里叶分析产生了多余的50hz分量，这个分量的数值比中心频率40hz的幅值还要大， 542143.TSCTINA-TI_SIMP_CHINESEuaf42TINA-TIhttps://e2echina.ti.com/support/tools/sim-hw-system-design/f/simulation-hardware-system-design-tools-forum/1071046/tina-ti_simp_chinese/3857614Fri, 01 May 2026 03:31:00 GMT91561404-af28-475a-b96b-cb6cbaadd097:4f3a1ddb-8aa9-40bf-ab94-6d5eec48ef10Lydia您好， 您可以参考这个帖子换一个浏览器试试， e2echina.ti.com/.../tina-ti_simp_chinesehttps://e2echina.ti.com/support/tools/sim-hw-system-design/f/simulation-hardware-system-design-tools-forum/1071046/tina-ti_simp_chineseWed, 29 Apr 2026 13:49:00 GMT91561404-af28-475a-b96b-cb6cbaadd097:c2a521a6-94de-496e-b60c-c892a552d79eyang liuPart Number: TINA-TI 无法下载该软件TINA-TI_SIMP_CHINESETINA-TIhttps://e2echina.ti.com/support/tools/sim-hw-system-design/f/simulation-hardware-system-design-tools-forum/1070500/ucc28070-why-are-the-output-and-input-voltage-values-the-same-in-the-ucc28070-transient-simulation-project-downloaded-from-the-ti-website/3856061Wed, 29 Apr 2026 01:39:00 GMT91561404-af28-475a-b96b-cb6cbaadd097:90f9749b-4727-4fab-bbcd-2d3647f5dba0Vivian GaoPlease refer to link below e2e.ti.com/.../2905812https://e2echina.ti.com/support/tools/sim-hw-system-design/f/simulation-hardware-system-design-tools-forum/1070500/ucc28070-why-are-the-output-and-input-voltage-values-the-same-in-the-ucc28070-transient-simulation-project-downloaded-from-the-ti-website/3854442Sun, 26 Apr 2026 23:11:00 GMT91561404-af28-475a-b96b-cb6cbaadd097:25ee9f8b-33ef-4885-92ed-6c66d28749a5LydiaHello, we have received your case and the investigation will take some time. Thank you for your patience.https://e2echina.ti.com/support/tools/sim-hw-system-design/f/simulation-hardware-system-design-tools-forum/1070500/ucc28070-why-are-the-output-and-input-voltage-values-the-same-in-the-ucc28070-transient-simulation-project-downloaded-from-the-ti-websiteSat, 25 Apr 2026 09:18:00 GMT91561404-af28-475a-b96b-cb6cbaadd097:ecbd706d-42e6-40e3-8126-24e655bcb872wen maoquanPart Number: UCC28070 The official simulation circuit does not perform voltage boosting. What's the problem here? I didn't make any changes to the circuit. Does not match the application description. PFC has no drive output.医疗和保健UCC28070https://e2echina.ti.com/support/tools/sim-hw-system-design/f/simulation-hardware-system-design-tools-forum/1069698/tps1689-calc-pspice-for-ti-concurrent-device-access-limit/3852034Wed, 22 Apr 2026 23:48:00 GMT91561404-af28-475a-b96b-cb6cbaadd097:8e7997f1-b17f-4a17-908f-06f0e02d79c5LydiaA faster method is to register a TI account with another email and then reapply for Pspice. We can also assist you with internal processing, but the process may take some time. Please provide your account information.https://e2echina.ti.com/support/tools/sim-hw-system-design/f/simulation-hardware-system-design-tools-forum/1069698/tps1689-calc-pspice-for-ti-concurrent-device-access-limit/3851943Wed, 22 Apr 2026 23:22:00 GMT91561404-af28-475a-b96b-cb6cbaadd097:c78eb93f-12ac-4a7a-8d5b-d3e5eb325cc0LydiaHello, we have received your case and the investigation will take some time. Thank you for your patience.https://e2echina.ti.com/support/tools/sim-hw-system-design/f/simulation-hardware-system-design-tools-forum/1069698/tps1689-calc-pspice-for-ti-concurrent-device-access-limitWed, 22 Apr 2026 14:43:00 GMT91561404-af28-475a-b96b-cb6cbaadd097:34f084cf-355d-4d43-b17c-1a45ff0f6eb6user6369895Part Number: TPS1689-CALC I get a "concurrent device access limit" error when I try to install PSpice on my computer at work. please help delink the previous installations. The computers are no longer in service.TPS1689-CALCPSPICE-FOR-TIhttps://e2echina.ti.com/support/tools/sim-hw-system-design/f/simulation-hardware-system-design-tools-forum/1069662/c2000ware-digitalpower-sdk-skd/3850960Wed, 22 Apr 2026 02:45:00 GMT91561404-af28-475a-b96b-cb6cbaadd097:747fca94-0ec2-4ed6-a301-18b8fddc06c6Eirwen关于软件遭拒，可以联系客户支持部门，会有客服为您提供帮助。 打开链接 ticsc.service-now.com/csm 点击“申请新的支持”下面的“提交申请”按钮 在新打开的窗口中点击“其他”下面的“创建案例”按钮 在打开的表格中您可以使用中文描述您的问题并且递交。https://e2echina.ti.com/support/tools/sim-hw-system-design/f/simulation-hardware-system-design-tools-forum/1069662/c2000ware-digitalpower-sdk-skd/3850957Wed, 22 Apr 2026 02:40:00 GMT91561404-af28-475a-b96b-cb6cbaadd097:7403f7ca-7513-4da9-96d6-6b6fbeb3121cEirwen已经收到了您的案例，调查需要些时间，感谢您的耐心等待。https://e2echina.ti.com/support/tools/sim-hw-system-design/f/simulation-hardware-system-design-tools-forum/1069662/c2000ware-digitalpower-sdk-skdWed, 22 Apr 2026 02:37:00 GMT91561404-af28-475a-b96b-cb6cbaadd097:6ef961ad-2911-470f-b9fb-4c4c5a15fe4dRoy YanPart Number: C2000WARE-DIGITALPOWER-SDK 下载SKD遭拒C2000WARE-DIGITALPOWER-SDKhttps://e2echina.ti.com/support/tools/sim-hw-system-design/f/simulation-hardware-system-design-tools-forum/1069440/tida-010963-tida-010963/3850124Tue, 21 Apr 2026 06:47:00 GMT91561404-af28-475a-b96b-cb6cbaadd097:9ce297d4-35b7-45c1-9fee-e7cd051cb060Taylor可以参考 PCB layout — TIDA-010963 文件。https://e2echina.ti.com/support/tools/sim-hw-system-design/f/simulation-hardware-system-design-tools-forum/1069440/tida-010963-tida-010963/3850123Tue, 21 Apr 2026 06:46:00 GMT91561404-af28-475a-b96b-cb6cbaadd097:26d8d579-dfc0-4ef0-ad4d-ee3467f29737Taylor您好， 已经收到了您的案例，调查需要些时间，感谢您的耐心等待。https://e2echina.ti.com/support/tools/sim-hw-system-design/f/simulation-hardware-system-design-tools-forum/1069452/tida-010270/3850122Tue, 21 Apr 2026 06:45:00 GMT91561404-af28-475a-b96b-cb6cbaadd097:c7032dfd-eacc-4668-a7be-3b307a187d54Taylor关于申请问题，我们这边并没有审批权限，请联系客服说明具体情况 ti.com.cn/zh-cn/info/contact-us.html