[问答]

为什么TDA7498E应用电路在输出端有肖特基二极管但TDA7498没有？

问答对人有帮助，内容完整，我也想知道答案 0 嗨ST。关于TDA7498和TDA7498E的应用，我有几个问题。 TDA7498E应用电路在输出端有肖特基二极管，但TDA7498没有，有这样的原因吗？由于音圈和交叉网络的组合电感约为4mH，我想要驱动的扬声器设计具有高电感。你能协助计算缓冲电路的C和R的正确值吗？我的低通滤波器基于6欧姆滤波器值（由于扬声器阻抗下降）。数据简报以330pF和22R为起点，我怀疑我需要与此不同。扬声器系统是8欧姆系统，但最小阻抗为4.9欧姆。我更好地将PCB改为使用TDA7498而不是TDA7498，从可靠性的角度来看，IC更好。该设计旨在尽可能可靠，从0.4K / W散热器开始，以保持封装冷却。谢谢，马库斯以上来自于谷歌翻译以下为原文 Hi ST. I have a few questions regarding the application of the TDA7498 and TDA7498E. The TDA7498E application circuit has schottky diodes on the output but the TDA7498 does not, is there a reason for this? The loudspeaker design I am wanting to drive has high inductance due to both the voice coil and crossover network with a combined inductance of approximately 4mH. Can you assist in calculating the correct values for C and R for the snubber circuit. I am basing my low pass filter on the 6 ohm filter values (due to speaker impedance dips). The data brief says 330pF and 22R as a starting point, I suspect I need to differ from this. The loudspeaker system is an 8 ohm system but has a minimum impedance of 4.9 ohms. Is it better for me to change my PCB to use the TDA7498E instead of the TDA7498 and from a reliability point of view which IC is better. The design is intended to be as reliable as practically possible starting with a 0.4K/W heatsink to keep the package running cold. Thanks, Marcus 0
2019-7-24 14:09:19　　评论淘帖0 邀请回答您可以邀请以下用户，快速回答问题 × wang21cj 该类别下有 44 个回答。邀请回答新星之火12138 该类别下有 41 个回答。邀请回答 chm5 该类别下有 39 个回答。邀请回答 hgimtk 该类别下有 33 个回答。邀请回答 HengDu 该类别下有 30 个回答。邀请回答 hwp0415229 该类别下有 28 个回答。邀请回答 jghgfdssas 该类别下有 28 个回答。邀请回答 kingnet6688 该类别下有 26 个回答。邀请回答颜刚YanG 该类别下有 26 个回答。邀请回答可口可甜该类别下有 26 个回答。邀请回答柱子图宁该类别下有 25 个回答。邀请回答 jenny042 该类别下有 25 个回答。邀请回答 kingnet9999 该类别下有 25 个回答。邀请回答 andyfly7 该类别下有 25 个回答。邀请回答麻酱该类别下有 25 个回答。邀请回答 zyh34997 该类别下有 25 个回答。邀请回答哼小曲该类别下有 24 个回答。邀请回答云汉007 该类别下有 24 个回答。邀请回答 ggfvxv 该类别下有 24 个回答。邀请回答 heks 该类别下有 24 个回答。邀请回答举报刘桂兰相关推荐 • 请问我能在直流放大器应用中使用TDA7498E吗？ 1871 • TDA7498E封装 2718 • 求TDA7498E封装SSO36 2666 • 求TDA7498E的封装 SSO-36 3065 • 我们应该如何为TDA7498E提供输入电压呢？ 431 • TDA7498没有任何输入信号，但也产生40KHZ调制波输出 2907 • 肖特基二极管应用的电路 3694 • TDA7498 100W2 功放板PCB,设计不成功请教大神 6390* • TDA-7498-L数据表烧伤该怎么办？ 886 • 肖特基二极管的应用电路是怎样的？ 2964 1个回答

答案对人有帮助，有参考价值 0 在Marcus，由于TDA7498E可以在单声道BTL模式下提供更高的输出电流来驱动低阻抗负载（2欧姆），那么这些二极管已用于降低尖峰电压电平。我想你在谈论BTL输出之间的缓冲网络22R + 330pF，你可以在输出和地之间将其改为10R + 680pF。但是对于感性负载，你需要用低输出功率的扬声器加交叉滤波器检查实际频率响应（否则你的高音扬声器可能烧坏），然后调整L + C值以平衡你在高频段的响应。由于你的负载阻抗可能是4.9欧姆，那么36V电源的输出电流可能很小，最好使用TDA7498E。谢谢 YT 以上来自于谷歌翻译以下为原文 hi Marcus,due to TDA7498E can deliver higher output current to drive low impedance load (2 ohm ) in mono BTL mode , then those diode had been used to reduce spike voltage level. I supposed you are talking about snubber networks 22R+330pF between BTL output, you may change it to 10R+680pF between output and ground . but regarding inductive load , you need to check the real frequency response with speaker plus crossover filter in low output power(otherwise your tweeter may be burnt out) , then adjusted L+C value to flat your response in upper audio band . since your load impedance could be 4.9 ohm , then output current may be marginal with 36V supply , it's better to use TDA7498E . Thanks YT

2019-7-24 14:18:26 评论举报王云