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[参考译文] UCC25600EVM:UCC25600参考设计

Guru**** 1737970 points
Other Parts Discussed in Thread: UCC25600, TL431, UCC25600EVM, UCC256303, PMP20694, UCC27714
请注意,本文内容源自机器翻译,可能存在语法或其它翻译错误,仅供参考。如需获取准确内容,请参阅链接中的英语原文或自行翻译。

https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/979206/ucc25600evm-ucc25600-ref-design

器件型号:UCC25600EVM
主题中讨论的其他器件:UCC25600TL431UCC256303PMP20694UCC27714

您好!

我想将 UCC25600控制器用于具有12V 输入和6V 输出的低电压 LLC 谐振转换器应用。

您是否会分享用于在输出和 RT 引脚之间创建隔离的光耦合器的器件型号? 或者、请提供光耦合器规格。

您能否解释一下我们为什么需要并联稳压器(TL431)?  

  • 请注意,本文内容源自机器翻译,可能存在语法或其它翻译错误,仅供参考。如需获取准确内容,请参阅链接中的英语原文或自行翻译。

    您好、Arteshir、

    UCC25600EVM 的光耦合器器件型号为 H11AB17A。我们也在其他设计中使用了 VO618A。

    并联稳压器充当误差放大器、可调节光耦合器中的电流量以实现输出调节。  

    此致、

    本·洛夫

  • 请注意,本文内容源自机器翻译,可能存在语法或其它翻译错误,仅供参考。如需获取准确内容,请参阅链接中的英语原文或自行翻译。

    您好 Ben、

    感谢您的意见。  

    我当前正在尝试使用 UCC25600运行仿真;但似乎我没有从 GD1和 GD2获取 PWM。

    我在几周前使用 TINA TI 运行了仿真、连接了中所示的相同电路、并且能够从转换器获得所需的输出。  

    我从 TI 网站下载了此控制器的 PSpice 模型;它如下所示-您是否确认此 Spice 模型是否准确?

  • 请注意,本文内容源自机器翻译,可能存在语法或其它翻译错误,仅供参考。如需获取准确内容,请参阅链接中的英语原文或自行翻译。

    请查看以下 LLC 转换器和控制器+反馈电路的原理图。  

    为了快速验证控制器功能、我现在对 SS 引脚施加5V 电压并禁用 OC。


    GD1和 GD2  

  • 请注意,本文内容源自机器翻译,可能存在语法或其它翻译错误,仅供参考。如需获取准确内容,请参阅链接中的英语原文或自行翻译。

    请在下面找到-"txt"中的模型

     UCC25600
    (小部分
    *(C)版权所有2013 Texas Instruments Incorporated。 保留所有权利。
    (小部分
    **此模型旨在为德州仪器(TI)的客户提供帮助。
    ** TI 及其许可人和供应商不作任何明示或默示的保证
    **或隐含的,关于本模型,包括的保证
    **用于特定目的的适销性或适销性。 是的
    **仅以"按原样"提供。 其质量的全部风险
    **且性能与客户有关
    (小部分
    *
    **发布者:德州仪器(TI)公司 WEBENCH 设计中心
    *部件:UCC25600
    *日期:2013年9月25日
    *模型类型:瞬态
    *仿真器:PSpice
    *仿真器版本:16.2.0.P001
    * EVM 订单号:EVM (HPA341)
    * EVM 用户指南:SLUU3612009年4月
    *数据表:SLUS846B 2008年9月 REVISED 2011年7月
    *
    *型号版本:最终版本1.00
    *
    (小部分
    *
    *更新:
    *
    *最终1.00版
    *发布到 Web
    *
    (小部分
    *
    *型号使用说明:
    *
    * 1. 已对以下功能建模
    *   a.开关频率 v/s RT 电阻器
    *   b.死区时间 v/s DT 电阻器
    * 2. 数据表中的图7、8、9、10、11未建模(考虑25°C 时的值)。
    *
    (小部分
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    CDNENCFINISH
    .ends UCC25600_trans

  • 请注意,本文内容源自机器翻译,可能存在语法或其它翻译错误,仅供参考。如需获取准确内容,请参阅链接中的英语原文或自行翻译。

    您好、Arteshir、

    您在 RT 和 DT 引脚上看到的电压是多少?

    此致、

    本·洛夫

  • 请注意,本文内容源自机器翻译,可能存在语法或其它翻译错误,仅供参考。如需获取准确内容,请参阅链接中的英语原文或自行翻译。

    您好 Ben、

    我确实看到 RT 引脚上的2.5V 电压和 DT 引脚上的2.25V 电压。

    此致、

    Ardy  

  • 请注意,本文内容源自机器翻译,可能存在语法或其它翻译错误,仅供参考。如需获取准确内容,请参阅链接中的英语原文或自行翻译。

    PSpice 模型是否正常? 是否已跳转? 请以粗体字查看下面的内容。

    SUBCKT UCC25600_TRANS DT OC RT SS VCC GD1 GD2 GND
    $CDNENCSTART
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    CDNENCFINISH
    .ends UCC25600_trans

  • 请注意,本文内容源自机器翻译,可能存在语法或其它翻译错误,仅供参考。如需获取准确内容,请参阅链接中的英语原文或自行翻译。

    您好、Arteshir、

    UCC25600 SPICE 模型采用这种方式、因为它是一个加密模型。

    检查从 RT 引脚拉出的电流大小。 如果从引脚上拉出的电流过大、控制器将不会切换。  

    此致、

    本·洛夫

  • 请注意,本文内容源自机器翻译,可能存在语法或其它翻译错误,仅供参考。如需获取准确内容,请参阅链接中的英语原文或自行翻译。

    是的、流出 RT 引脚的电流接近10mA (高于技术规格表中规定的值)

    它是否与软启动引脚相关? 现在、我将对 SS 引脚施加5Vdc 的电压。

    BTW、我已经使用脉冲发生器进行了开环仿真、一切都按预期工作。 只需使控制器正常工作。

    谢谢、

    Ardy

  • 请注意,本文内容源自机器翻译,可能存在语法或其它翻译错误,仅供参考。如需获取准确内容,请参阅链接中的英语原文或自行翻译。

    您好、Arteshir、

    现在尝试断开光耦合器。 也许有些事情并不完全正确。 查看移除 R10后 RT 引脚是否变得更合理。

    此致、

    本·洛夫

  • 请注意,本文内容源自机器翻译,可能存在语法或其它翻译错误,仅供参考。如需获取准确内容,请参阅链接中的英语原文或自行翻译。

    我做了三个实验来查看控制器是否正常工作:

    完全禁用反馈电路、而是添加了3.5mA 的电流源、使控制器以固定频率和开环方式进行脉冲。

    GD1和 GD2仍然不会产生 PWM、但输出电压(绿色)持续几微秒。

    2.我移除了整个 FB 电路并向 R10添加了3.3V 直流电源、并移除了 SS 引脚上的直流电源:

    仍然没有 PWM;但 RT 电流降至1.5mA。

    3.如果我移除 R10和光耦合器、RT 电流甚至更高-12mA

  • 请注意,本文内容源自机器翻译,可能存在语法或其它翻译错误,仅供参考。如需获取准确内容,请参阅链接中的英语原文或自行翻译。

    您好、Arteshir、

    很抱歉、我不认为您的图片会将其添加到您的帖子中。 您可以再次发布吗?

    此致、

    本·洛夫

  • 请注意,本文内容源自机器翻译,可能存在语法或其它翻译错误,仅供参考。如需获取准确内容,请参阅链接中的英语原文或自行翻译。

    您好、Arteshir、

    作为侧注、在图腾柱驱动结构中、PNP 看起来是颠倒的。 我建议翻转它们以获得正确的连接。

    此致、

    本·洛夫

  • 请注意,本文内容源自机器翻译,可能存在语法或其它翻译错误,仅供参考。如需获取准确内容,请参阅链接中的英语原文或自行翻译。

    抱歉-我注意到它没有上传图片-以下是每次试用的图片:

    我做了三个实验来查看控制器是否正常工作:

    完全禁用反馈电路、而是添加了3.5mA 的电流源、使控制器以固定频率和开环方式进行脉冲。

    GD1和 GD2仍然不会产生 PWM、但输出电压(绿色)持续几微秒。

    2.我移除了整个 FB 电路并向 R10添加了3.3V 直流电源、并移除了 SS 引脚上的直流电源:

    我做了三个实验来查看控制器是否正常工作:

    3.如果我移除 R10和光耦合器、RT 电流甚至更高-12mA

  • 请注意,本文内容源自机器翻译,可能存在语法或其它翻译错误,仅供参考。如需获取准确内容,请参阅链接中的英语原文或自行翻译。

    您好 Ben、

    我忘了说、我已经在 TINA TI 上毫无问题地仿真了相同的原理图、并且能够使用 ZVS 获得所需的输出。

    这就是为什么我认为 PSpice 模型可能有问题的原因。  

    请参见下图:

     

    您还向 TI 推荐了什么其他谐振控制器? 我已经了解  了 UCC256303;但没有可用的 PSpice 模型。

    此致、

    Ardy

  • 请注意,本文内容源自机器翻译,可能存在语法或其它翻译错误,仅供参考。如需获取准确内容,请参阅链接中的英语原文或自行翻译。

    您好 Ben、

    我能够使控制器正常工作-我更改了 RT1和 RT2电阻器、并删除了 BJT、控制器现在可以工作。 我最初在数据表中使用了每个参考设计的 BJT。 您能否解释一下为什么有必要将 BJT 作为栅极驱动电路的一部分?

    请提供 LM293AD SPICE 模型吗? 从网站上、我下载的文件似乎不是.lib 或.olb 文件。

    此致、

    Ardy

  • 请注意,本文内容源自机器翻译,可能存在语法或其它翻译错误,仅供参考。如需获取准确内容,请参阅链接中的英语原文或自行翻译。

    您好、Arteshir、

    BJT 结构只是一个图腾柱栅极驱动器。 它提高了进入栅极驱动变压器的栅极信号的电流驱动能力。 没有明确需要图腾柱驱动器。 您还可以将 UCC25600与半桥驱动器配对、例如 UCC27714。 您可以将 PMP20694称为基准。

    此致、

    本·洛夫