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LM5145 bảng dữ liệu(PDF) 39 Page - Texas Instruments

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Giải thích chi tiết về linh kiện  LM25139 42V, Synchronous Buck DC/DC Controller With Dual Random Spread Spectrum for Advanced EMI Mitigation
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LM5145 bảng dữ liệu(HTML) 39 Page - Texas Instruments

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7.2.2 Design 2 – High-Efficiency, 440kHz, Synchronous Buck Regulator
The following figure shows the schematic diagram of a single-output synchronous buck regulator with an output
voltage of 3.3V and a rated load current of 12A. In this example, the current is sensed using a resistor placed in
series with the output inductor. The switching frequency is set at 440kHz by resistor RT. The 3.3V output voltage
is achieved by connecting FB directly to VCC.
FPWM/SYNC
AGND
PGND
VOUT
ISNS
LO
SW
HO
CBOOT
VIN
COMP
VCC
PG
EN
RT
LM25139
FB
RT
RCOMP
CCOMP
CHF
CVCC
CBOOT
CIN
COUT
RS
LO
VIN = 5.5V...36V
VOUT = 3.3V
IOUT = 12A
High = FPWM
Low = PFM
Q2
Q1
VCC
4
47 F
15nF
2
10 F
6.04k
100pF
1.5 H
53.6k
4.7 F
3m
0.1 F
Figure 7-13. Application Circuit 2 With the LM25139 Buck Regulator at 440kHz
www.ti.com
LM25139
SLVSJ80 – OCTOBER 2025
Copyright © 2025 Texas Instruments Incorporated
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Product Folder Links: LM25139



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