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L6911E Datasheet(PDF) 24 Page - STMicroelectronics

Part # L6911E
Description  5-Bit programmable step down controller with synchronous rectification
PDF  34 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6911E Datasheet(HTML) 24 Page - STMicroelectronics

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VRM demo board description
L6911E
24/34
6
VRM demo board description
Figure 12 shows the schematic circuit of the VRM evaluation board. The design has been
developed for a VRM 8.5 Flexible Motherboard applicaton delivering up to 28.5A.
An additional circuit sense a Vtt bus (1.2V typ.) and generate a 2.5mS (typ.) delayed
Vtt_PWRGD signal when this rail is over 1.1V. The assertion of the Vtt_PWRGD signal
enables the device together with the ENOUT input.
Figure 12. Schematic circuit
L6911E CONNECTOR EVALUATION KIT REV. 1.1
L2
L1
R7
R8
R9
C1-3
C10
C4-9
C17
Q3,Q4,Q5
Q1,Q2
D2
C12
F1
16
17
13
14
2
4
5
6
7
8
U1
L6911E
+5 VIN
+12Vcc
VOUTCORE
Vss
10
15
9
3
20
18
11
19
12
1
VCC
GND
VID0
VID1
VID2
VID3
VID4
SS
OSC
OCSET
UGATE
PHASE
LGATE
PGND
PGOOD
VSEN
R3
R4
R5
R2
C18
C19
C20
VID0
VID1
VID2
VID3
VID25mV
C11
D1
R6
R1
Vtt_PGOOD
UZ
TLC7701
8
2
4
7
3
5
6
1
OUTEN
Vtt_sense
Vdd
NOT RESIN
GND
SENSE
CT
NOT RESET
CONTROL
RESET
R14
C15
R12
Q6
R10
R11
C16
C14
Q7
C13
R13
D3
PWRGD
R15



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