https://e2echina.ti.com/support/power-management/f/power-management-forum/1078328/lm74700-q1-gatePart Number: LM74700-Q1 通过仿真，在改变负载电阻和输入电压后，发现GATE输出电压总是仅高于输入电压2.97Vzh-CNTelligent Community 13Wed, 10 Jun 2026 02:38:25 GMThttps://e2echina.ti.com/thread/3883042?ContentTypeID=1Wed, 10 Jun 2026 02:38:25 GMT91561404-af28-475a-b96b-cb6cbaadd097:775c31bb-0020-411c-af6a-84fde9dd0445Daniel<p>您好</p> <p>For the LM74700-Q1 to operate in full conduction mode the gate driver must be enabled as described in the Gate Driver section and the current from source to drain of the external MOSFET must be large enough to result in an ANODE to CATHODE voltage drop of greater than 50-mV typical. If these conditions are achieved the GATE pin is internally connected to the VCAP pin resulting in the GATE to ANODE voltage being approximately the same as the VCAP to ANODE voltage. By connecting VCAP to GATE the external MOSFET&#39;s RDS(ON) is minimized reducing the power loss of the external MOSFET when forward currents are large.</p> <p>这是官方datasheet给出的操作建议。</p><div style="clear:both;"></div>https://e2echina.ti.com/thread/3883036?ContentTypeID=1Wed, 10 Jun 2026 02:24:47 GMT91561404-af28-475a-b96b-cb6cbaadd097:55d96a5e-a1d8-4494-bf55-9003e9bc86b6ZG QU<p>所以在MOS管型号确定的情况下，我要提高GATE电压，只能不断提高负载电流，且LM74700只能工作在调节导通模式</p><div style="clear:both;"></div>https://e2echina.ti.com/thread/3883032?ContentTypeID=1Wed, 10 Jun 2026 02:07:04 GMT91561404-af28-475a-b96b-cb6cbaadd097:95abd3f6-6024-4d4c-99d3-3de6ebfe8a43Daniel<p>您好</p> <p>您如果问Gate的输出电压与什么有关上述回复中的datasheet有详细说明。</p> [quote userid="168436" url="~/support/power-management/f/power-management-forum/1078328/lm74700-q1-gate/3883020"]比如在完全导通模式下，GATE电压永远仅比输入电压高2.97V[/quote] <p>根据datasheet说明这个不是处于完全导通的模式下，以下帖子有相关说明</p> <p><a href="https://e2echina.ti.com/support/power-management/f/power-management-forum/219222/faq-oring">e2echina.ti.com/.../faq-oring</a></p><div style="clear:both;"></div>https://e2echina.ti.com/thread/3883020?ContentTypeID=1Wed, 10 Jun 2026 00:41:09 GMT91561404-af28-475a-b96b-cb6cbaadd097:e9d2706a-39c5-49f1-ad0f-f0381ef70702ZG QU<p>那它的输出的电压幅值大小和什么有关？比如在完全导通模式下，GATE电压永远仅比输入电压高2.97V</p><div style="clear:both;"></div>https://e2echina.ti.com/thread/3883017?ContentTypeID=1Tue, 09 Jun 2026 23:42:17 GMT91561404-af28-475a-b96b-cb6cbaadd097:2ac722fe-c8f2-4937-8d9e-b5feb48d7982Daniel<p>您好</p> [quote userid="168436" url="~/support/power-management/f/power-management-forum/1078328/lm74700-q1-gate/3882136"]我是想知道GATE引脚输出电压，是由什么决定的[/quote] <p><a id="" href="https://www.ti.com/lit/ds/symlink/lm74700-q1.pdf">https://www.ti.com/lit/ds/symlink/lm74700-q1.pdf</a></p> <p>9.3.3 Gate Driver</p> <p>有详细的图文说明。</p><div style="clear:both;"></div>https://e2echina.ti.com/thread/3882140?ContentTypeID=1Tue, 09 Jun 2026 08:53:26 GMT91561404-af28-475a-b96b-cb6cbaadd097:622826a8-d0b5-4db4-83a3-25ebf1550969Lydia<p><span style="font-family:&#39;MS Gothic&#39;;" lang="zh-CN">您好，</span><span style="font-family:&#39;MS Gothic&#39;;" lang="en-US">已</span><span style="font-family:&#39;Microsoft YaHei&#39;;" lang="en-US">经</span><span style="font-family:&#39;MS Gothic&#39;;" lang="en-US">收到了您的案例，</span><span style="font-family:&#39;Microsoft YaHei&#39;;" lang="en-US">调查</span><span style="font-family:&#39;MS Gothic&#39;;" lang="en-US">需要些</span><span style="font-family:&#39;Microsoft YaHei&#39;;" lang="en-US">时间</span><span style="font-family:&#39;MS Gothic&#39;;" lang="en-US">，感</span><span style="font-family:&#39;Microsoft YaHei&#39;;" lang="en-US">谢</span><span style="font-family:&#39;MS Gothic&#39;;" lang="en-US">您的耐心等待。</span></p><div style="clear:both;"></div>https://e2echina.ti.com/thread/3882137?ContentTypeID=1Tue, 09 Jun 2026 08:44:29 GMT91561404-af28-475a-b96b-cb6cbaadd097:42d04746-8f50-4d5e-ad87-5b77cc4f0f00ZG QU<p><img style="max-height:240px;max-width:320px;" alt=" " src="https://e2echina.ti.com/resized-image/__size/640x480/__key/communityserver-discussions-components-files/24/8836._3575EF8DFE56_.png" />20V输入的仿真电路图</p><div style="clear:both;"></div>https://e2echina.ti.com/thread/3882136?ContentTypeID=1Tue, 09 Jun 2026 08:40:57 GMT91561404-af28-475a-b96b-cb6cbaadd097:70b526ee-1d53-48ec-b50f-79ce2a89f393ZG QU<p>我是想知道GATE引脚输出电压，是由什么决定的</p><div style="clear:both;"></div>