поискавой системы для электроныых деталей |
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IRF7805ATRPBF датащи(PDF) 4 Page - International Rectifier |
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IRF7805ATRPBF датащи(HTML) 4 Page - International Rectifier |
4 / 8 page www.irf.com 4 IRF7805/IRF7805APbF Figure 2: Q oss Characteristic For the synchronous MOSFET Q2, R ds(on) is an im- portant characteristic; however, once again the impor- tance of gate charge must not be overlooked since it impacts three critical areas. Under light load the MOSFET must still be turned on and off by the con- trol IC so the gate drive losses become much more significant. Secondly, the output charge Q oss and re- verse recovery charge Q rr both generate losses that are transfered to Q1 and increase the dissipation in that device. Thirdly, gate charge will impact the MOSFETs’ susceptibility to Cdv/dt turn on. The drain of Q2 is connected to the switching node of the converter and therefore sees transitions be- tween ground and V in. As Q1 turns on and off there is a rate of change of drain voltage dV/dt which is ca- pacitively coupled to the gate of Q2 and can induce a voltage spike on the gate that is sufficient to turn the MOSFET on, resulting in shoot-through current . The ratio of Q gd/Qgs1 must be minimized to reduce the potential for Cdv/dt turn on. Spice model for IRF7805 can be downloaded in ma- chine readable format at www.irf.com. |
Аналогичный номер детали - IRF7805ATRPBF |
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Аналогичное описание - IRF7805ATRPBF |
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