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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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NX2139A датащи(PDF) 17 Page - Microsemi Corporation |
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NX2139A датащи(HTML) 17 Page - Microsemi Corporation |
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17 / 21 page  NX2139A 17 Rev. 2.3 03/19/09 5. Source of the lower MOSFET needs to be con- nected to the GND plane with multiple vias. One is not enough. This is very important. The same applies to the output capacitors and input capacitors. 6. Hdrv and Ldrv pins should be as close to MOSFET gate as possible. The gate traces should be wide and short. A place for gate drv resistors is needed to fine tune noise if needed. 7. Vcc capacitor, BST capacitor or any other by- passing capacitor needs to be placed first around the IC and as close as possible. The capacitor on comp to GND or comp back to FB needs to be place as close to the pin as well as resistor divider. 8. The output sense line which is sensing output back to the resistor divider should not go through high frequency signals, should be kept away from the in- ductor and other noise sources. The resistor divider must be located as close as possible to the FB pin of the device. 9. All GNDs need to go directly thru via to GND plane. 10. In multilayer PCB, separate power ground and analog ground. These two grounds must be con- nected together on the PC board layout at a single point. The goal is to localize the high current path to a sepa- rate loop that does not interfere with the more sensi- tive analog control function. |
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