전자부품 데이터시트 검색엔진 |
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L6743 데이터시트(PDF) 10 Page - STMicroelectronics |
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L6743 데이터시트(HTML) 10 Page - STMicroelectronics |
10 / 17 page Device description and operation L6743, L6743Q 10/17 When designing an application based on L6743, L6743Q it is recommended to take into consideration the effect of external gate resistors on the power dissipated by the driver. External gate resistors helps the device to dissipate the switching power since the same power PSW will be shared between the internal driver impedance and the external resistor resulting in a general cooling of the device. Referring to Figure 6, classical MOSFET driver can be represented by a push-pull output stage with two different MOSFETs: P-MOSFET to drive the external gate high and N- MOSFET to drive the external gate low (with their own RDS(on): Rhi_HS, Rlo_HS, Rhi_LS, Rlo_LS). The external power MOSFET can be represented in this case as a capacitance (CG_HS, CG_LS) that stores the gate-charge (QG_HS, QG_LS) required by the external power MOSFET to reach the driving voltage (PVCC for HS and VCC for LS). This capacitance is charged and discharged at the driver switching frequency FSW. The total power Psw is dissipated among the resistive components distributed along the driving path. According to the external gate resistance and the power-MOSFET intrinsic gate resistance, the driver dissipates only a portion of Psw as follow: The total power dissipated from the driver can then be determined as follow: Figure 6. Equivalent circuit for MOSFET drive P SW HS – 1 2 --- C GHS PVCC 2 Fsw R hiHS R hiHS R GateHS R iHS ++ ---------------------------------------------------------------- R loHS R loHS R GateHS R iHS ++ ---------------------------------------------------------------- + ⎝⎠ ⎛⎞ ⋅⋅ ⋅ ⋅ = P SW LS – 1 2 --- C GLS VCC 2 Fsw R hiLS R hiLS R GateLS R iLS ++ -------------------------------------------------------------- R loLS R loLS R GateLS R iLS ++ -------------------------------------------------------------- + ⎝⎠ ⎛⎞ ⋅⋅ ⋅ ⋅ = PP DC P SW HS – P SW LS – ++ = RGATELS RILS CGLS VCC LS DRIVER LS MOSFET GND LGATE RGATEHS RIHS CGHS BOOT HS DRIVER HS MOSFET PHASE HGATE VCC |
유사한 부품 번호 - L6743_08 |
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유사한 설명 - L6743_08 |
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