L6911C View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'L6911C' PDF : 20 Pages View PDF
L6911C
Figure 9. Voltage regulation with droop function block scheme
Vcomp
Av(s)
Vout
R (s )
R OUT ⋅ 1 + s ⋅ τ L
1+ s ⋅τd
Iout
It results:
ZOUT
=
-----V----o------
ILOAD
=
Rd
⋅
1-1----++-----ss----ττ--Ld--
⋅
-----G-----L---O----O----P-------
1 + GLOOP
=
ROUT ⋅ 11-----++-----ss----ττ--Ld--
Because in the interested range |Gloop|>>1.
To obtain a flat shape, the relationship considered will naturally follow.
Demo Board Description
The L6911C demo board shows the operation of the device in a standard VRM 8.4 application. This evaluation
board allows voltage adjustability (1.3V - 3.5V) through the switches S1-S5 and high output current capability
(up to 14A). The device is supplied by the 12V input rail while the power conversion starts from the 5V input rail.
The device is also able to operate with a 5V supply voltage; in this case 12V input can be directly connected to
the 5V power source. The four layers demo board's copper thickness is of 70µm in order to minimize conduction
losses considering the high current that the circuit is able to deliver. Figure 10 shows the demo board's sche-
matic circuit.
Figure 10. Demo Board Schematic
+5 VIN
F1
L1
GNDIN
Q8
G1
C21-22
C1-5
+12Vcc
GND12
C17
S1
S2
S3
S4
S5
C16
D1
C24
C23
15
VCC
18
19
OCSET
R7
2
GND
11
14
VID0
4
VID1
5
VID2
6
13
U1
17
VID3 7 L6911C
16
VID4
8
SS
12
3
UGATE
PHASE
LGATE
PGND
PGOOD
R13
Q1-2
R14
Q4-5
OSC
20
VSEN
1
9
10
R1
C18
R3
C19 R5
C20 R4
R2
L2
VOUTCORE
D2
C6-15
R12
GNDCORE
PWRGD
R8
R9
C25
L6911-L6912 EVALUATION KIT REV.
14/20
Share Link: 
