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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LTC4244IGN датащи(PDF) 21 Page - Linear Technology |
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LTC4244IGN датащи(HTML) 21 Page - Linear Technology |
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21 / 28 page  21 LTC4244/LTC4244-1 42441f are experimentally determined based on the board’s para- sitic resonance circuits. As a starting point, the capacitors in these networks are chosen to be 10 × to 100× the power MOSFET’s COSS under bias. The series resistor is a value determined experimentally that ranges from 1 Ω to 50Ω, depending on the parasitic resonance circuit. Note that in all LTC4244 circuit schematics, both transient voltage limiters and snubber networks have been added to the 12VIN and VEEIN supply rails and should always be used. Snubber networks are not necessary on the 3.3VIN or the 5VIN supply lines since their absolute maximum voltage ratings are 13.5V. Transient voltage limiters, however, are recommended as these devices provide large-scale tran- sient protection for the LTC4244 in the event of abrupt changes in supply current. All protection networks should be mounted very close to the LTC4244’s supply pins using short lead lengths to minimize trace resistance and induc- tance. This is shown schematically in Figures 12 and 13 and a recommended layout of the transient protection devices around the LTC4244 is shown in Figure 14. APPLICATIO S I FOR ATIO C1 0.047 µF 3.3VIN 3VIN 3.3V 5VIN 5V 3.3VSENSE 17 3.3VOUT 18 5VIN 13 5VOUT 3 5VSENSE 14 16 GATE 15 R3 10 Ω R4 10 Ω 5VOUT 5V 3VOUT 3.3V R5 1k R1 0.005 Ω Q1 IRF7457 Q2 IRF7457 R2 0.007 Ω Z3 Z4 LTC4244* 4244 F12 GND 8 Z3, Z4: SMAJ5.0A *ADDITIONAL DETAILS OMITTED FOR CLARITY Figure 12. Place Transient Protection Devices Close to LTC4244’s 5VIN and 3.3VIN Pins 12VIN 1 VEEIN 12VIN –12VIN 2 Z1 Z2 R14 10 Ω C5 0.1 µF LTC4244* 4244 F16 GND 8 Z1, Z2: SMAJ12CA *ADDITIONAL DETAILS OMITTED FOR CLARITY R13 10 Ω C4 0.1 µF VIAS TO GND PLANE C4 R13 GND 5VIN LTC4244* *ADDITIONAL DETAILS OMITTED FOR CLARITY DRAWING IS NOT TO SCALE! 4244 F14 3.3VIN VEEIN 12VIN C5 R14 Z4 Z1 Z1 Z3 Figure 13. Place Transient Protection Devices Close to LTC4244’s 12VIN and VEEIN Pins Figure 14. Recommended Layout for Transient Protection Components |
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