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AN4192 Folha de dados(PDF) 28 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) 28 Page - STMicroelectronics

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Low-side FET selection
AN4192
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Doc ID 023820 Rev 1
Figure 31.
LS with monolithic Schottky diode waveforms @ 20 A
The efficiency improvement caused by an optimized LS body diode can be appreciated only
if the converter switching frequency increases: in fact, the higher the fSW, the larger the
reverse recovery losses (see (5)). We compare the above mentioned LS FETs (LS and
LS+Sch.) in a 2-phase synchronous buck converter (VIN = 12 V, VOUT = 1.5 V, fSW = 610
kHz, 2 x HS, 2 x LS, IOUT = 60 A - Figure 32). External gate resistances are connected to
HS (2.2
Ω) and LS (2.2 Ω) FETs. No snubber network is mounted on the board.
As can be seen in Figure 33, at high output currents, due to lower diode conduction and
reverse recovery losses, the solution with LS+Sch. has higher efficiency (+1.5% at full load).
AM16474V1



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