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AN4192 Folha de dados(PDF) 33 Page - STMicroelectronics

Nome de Peças AN4192
Descrição Electrónicos  In the latest generation of CPUs for modern desktop and notebook platforms
PDF  47 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4192 Folha de dados(HTML) 33 Page - STMicroelectronics

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AN4192
Low-side FET selection
Doc ID 023820 Rev 1
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Figure 39.
2-phase synchronous buck converter
In a 2-phase synchronous buck converter (Figure 39) (VIN = 12 V, VOUT = 1.5 V, IOUT = 44 A,
1 x HS, 2 x LS, fSW = 440 kHz), two LS FETs with different RG,INT values (RG1 = 1.3 Ω, RG2
= 2.8
Ω) are compared. External HS and LS gate resistances are present in the layout
(RG,HS = 2.2 Ω, RG,LS = 2.2 Ω).
Higher intrinsic gate resistance is helpful to smooth the phase node overshoot, when no RC
snubber network is connected in parallel to the LS FET. In Figure 40 and 41 the phase node
waveforms of the two LS FETs tested at full load conditions (IOUT = 44 A) are compared.
AM16482V1



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