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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PM6686TR датащи(PDF) 40 Page - STMicroelectronics |
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PM6686TR датащи(HTML) 40 Page - STMicroelectronics |
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40 / 50 page  Application information PM6686 40/50 Doc ID 15281 Rev 4 Finally the output capacitor choice deeply impacts on the load transient response. Below there is a list of some capacitor manufacturers. Output capacitor manufacturer 10.1.4 MOSFET Logic-level MOSFETs are recommended, since low-side and high-side gate drivers are powered by PVCC. Their breakdown voltage (VBRDSS) must be higher than the maximum input voltage. In notebook applications, power management efficiency is a high level requirement. The power dissipation on the power switches becomes an important factor in switching selections. Losses of high-side and low-side MOSFETs depend on their working conditions. The power dissipation of the high-side MOSFET is given by: Equation 14 Maximum conduction losses are approximately: Equation 15 Where RDS(on) is the drain-source on resistance of the high-side MOSFET. Switching losses are approximately: Equation 16 Where ton and toff are the switching times of the turn off and turn off phases of the MOSFETs. As general rule, high-side MOSFETs with low gate charge are recommended, in order to minimize driver losses. Below there is a list of possible choices for the high-side MOSFETs. Table 16. Input capacitor manufacturer Manufacturer Series Capacitor value (µF) Rated voltage (V) E SR max (mΩ) SANYO POSCAP TPB 150 to 330 2.5 to 6.3 35 to 65 SANYO POSCAP TPF 150 to 470 2.5 to 6.3 7 to 15 switching conduction DHighSide P P P + = 2 LOAD min IN OUT DSon conduction (max) I V V R P × × = 2 f t ) 2 I (max) I ( V 2 f t ) 2 I (max) I ( V P sw off L LOAD IN sw on L LOAD IN switching × × Δ + × + × × Δ − × = |
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