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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) 41 Page - STMicroelectronics |
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PM6686TR датащи(HTML) 41 Page - STMicroelectronics |
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41 / 50 page  PM6686 Application information Doc ID 15281 Rev 4 41/50 The power dissipation of the low-side MOSFET is given by: Equation 17 Maximum conduction losses occur at the maximum input voltage: Equation 18 Choose a synchronous rectifier with low RDS(on). When high-side MOSFET turns on, the fast variation of the phase node voltage can bring up even the low-side gate through its gate-drain capacitance CRSS, causing cross-conduction problems. Choose a low-side MOSFETs that minimizes the ratio CRSS/CGS (CGS = CISS - CRSS). Below there is a list of some possible low-side MOSFETs. Dual N-channel MOSFETs can be used in applications with a maximum output current of about 3 A. Below there is a list of some MOSFETs manufacturers. Table 17. High-side MOSFET manufacturer Manufacturer Type Gate charge (nC) RDS(on) (mΩ) Rated reverse voltage (V) ST STS12NH3LL 10 8 30 ST STS17NH3LL 18 4 30 Table 18. Low-side MOSFET manufacturer Manufacturer Type RDS(on) (mΩ) Rated reverse voltage (V) ST STS17NF3LL 5.5 0.047 30 ST STS25NH3LL 3.5 0.011 30 Table 19. Dual MOSFET manufacturer Manufacturer Type RDS(on) (mΩ) Gate charge (nC) Rated reverse voltage (V) ST STS8DNH3LL 25 10 30 ST STS4DNF60L 65 32 60 conduction DLowSide P P = 2 LOAD max IN OUT DSon conduction (max) I V V 1 R P × ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ − × = GS RSS C C |
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