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STD60NH03L Scheda tecnica(PDF) 10 Page - STMicroelectronics |
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STD60NH03L Scheda tecnica(HTML) 10 Page - STMicroelectronics |
10 / 12 page STD60NH03L 10/12 SW1 SW2 APPENDIX A Buck Converter: Power Losses Estimation The power losses associated with the FETs in a Synchronous Buck converter can be estimated using the equations shown in the table below. The formulas give a good approximation, for the sake of performance comparison, of how different pairs of devices affect the converter efficiency. However a very important parameter, the working temperature, is not considered. The real device behavior is really dependent on how the heat generated inside the devices is removed to allow for a safer working junction temperature. The low side (SW2) device requires: • Very low RDS(on) to reduce conduction losses • Small Qgls to reduce the gate charge losses • Small Coss to reduce losses due to output capacitance • Small Qrr to reduce losses on SW1 during its turn-on • The Cgd/Cgs ratio lower than Vth/Vgg ratio especially with low drain to source voltage to avoid the cross conduction phenomenon; The high side (SW1) device requires: • Small Rg and Ls to allow higher gate current peak and to limit the voltage feedback on the gate • Small Qg to have a faster commutation and to reduce gate charge losses • Low RDS(on) to reduce the conduction losses. |
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