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データシートサーチシステム |
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データシートサーチシステム |
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IRF7807APBF データシート(PDF) 4 Page - International Rectifier |
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IRF7807APBF データシート(HTML) 4 Page - International Rectifier |
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4 / 8 page  www.irf.com 4 IRF7807/APbF 5V Supply : Q1=Q2=IRF7807 89 90 91 92 93 94 95 11.522.533.544.5 5 Load Current (A) Vin = 10V Vin = 14V Vin=24V Typical Mobile PC Application The performance of these new devices has been tested in circuit and correlates well with performance predic- tions generated by the system models. An advantage of this new technology platform is that the MOSFETs it produces are suitable for both control FET and syn- chronous FET applications. This has been demon- strated with the 3.3V and 5V converters. (Fig 3 and Fig 4). In these applications the same MOSFET IRF7807 was used for both the control FET (Q1) and the syn- chronous FET (Q2). This provides a highly effective cost/performance solution. 3.3V Supply : Q1=Q2=IRF7807 84 85 86 87 88 89 90 91 92 93 11.522.5 33.5 44.5 5 Load Current (A) Vin = 10V Vin = 14V Vin = 24V Figure 3 Figure 4 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 IRF7807 can be downloaded in ma- chine readable format at www.irf.com. |
同様の部品番号 - IRF7807APBF |
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同様の説明 - IRF7807APBF |
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