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L6732 Datasheet(PDF) 26 Page - STMicroelectronics

Part # L6732
Description  Adjustable step-down controller with synchronous rectification
PDF  36 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6732 Datasheet(HTML) 26 Page - STMicroelectronics

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L6732 demoboards
L6732
26/36
7
L6732 demoboards
7.1
20A board description and PCB layout
L6732 20A demoboard realizes in a four layer PCB a step-down DC/DC converter and shows
the operation of the device in a general purpose application. The input voltage can range from
4.5V to 14V and the output voltage is at 3.3V. The module can deliver an output current in
excess of 20A. The switching frequency is set at 250KHz (controller free-running Fsw) but it
can be set to 500KHz acting on the EAREF pin.
Figure 20. Demoboard schematic
L1
Q1-3
Q4-6
D3
9
U1
L6732
VIN
VOUT
12
OCH
C11
GOUT
R9
C9
13
14
10
11
HGATE
PHASE
LGATE
PGND
7
VCC
16
VCC
6
SS
C4
BOOT
D1
15
VCCDR
C10
5
VFB
COMP
R3
R1
C1
R2
C2
C3
R4
R7
8
EAREF
C7
R8
4
3
GND
GIN
OCL
R10
R11
C12-C13
C16-C19
C5
R6
R5
C8
J1
R12
C15
EXTREF
J2
PGOOD
SYNCH
1
2
SYNCH
VCCDR
PGOOD
R13



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