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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AN4192 датащи(PDF) 17 Page - STMicroelectronics |
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AN4192 датащи(HTML) 17 Page - STMicroelectronics |
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17 / 47 page  AN4192 High-side MOSFET selection Doc ID 023820 Rev 1 17/47 Figure 16. Asymmetric HS gate drive circuit Figure 17. 3-phase synchronous buck converter Let's now consider a 3-phase synchronous buck converter (Figure 17) (VIN = 12 V, VOUT = 1.25 V, fSW = 270 kHz, 2 x HS, 2 x LS, IOUT = 75 A). External gate resistances are connected to HS (2.2 Ω) and LS (2.2 Ω) FETs. An RC snubber network (RSNUB = 2.2 Ω, CSNUB =4.7nF)is usedto smooththephasenode.Two differentHSdriving configurations (standard with RG,EXT = 2.2 Ω, “asymmetric gate drive” with RG1 = 3.9 Ω, RG1 = 1.8 Ω) are compared in terms of phase node ringing and efficiency comparison. In Figure 18 and 19 the phase node waveforms of the two configurations are shown. AM16460V1 AM16461V1 |
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