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AN4192 bảng dữ liệu(PDF) 18 Page - STMicroelectronics

tên linh kiện AN4192
Giải thích chi tiết về linh kiện  In the latest generation of CPUs for modern desktop and notebook platforms
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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AN4192 bảng dữ liệu(HTML) 18 Page - STMicroelectronics

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High-side MOSFET selection
AN4192
18/47
Doc ID 023820 Rev 1
Figure 18.
Phase node waveform - standard configuration
Figure 19.
Phase node waveform - HS asymmetric gate drive configuration
Looking at the previous waveforms, due to the reduced HS turn-on speed, there is a clear
reduction of the phase node spike (21 V vs. 24.4 V), when the HS asymmetric gate drive is
used. Moreover, the LS gate-source bouncing, induced at HS turn-on, is smoothed.
Comparing the efficiency curves (Figure 20), the asymmetric gate drive has slightly better
efficiency (+0.7% at full load). This can be explained considering that:
1.
The HS turn-off resistor is smaller (1.8
Ω vs. 2.2 Ω) and consequently the switching
losses at turn-off are lower.
2.
Even if the HS turn-on resistor is bigger, the switching losses at turn-on are negligible.
AM16462V1
AM16463V1



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