E-L6911C STMicroelectronics, E-L6911C Datasheet - Page 14

• Manufacturer Part Number: E-L6911C
• Description: IC CTRLR 5BIT PROGR STPDN 20SOIC
• Manufacturer: STMicroelectronics
• Type: Step-Down (Buck)r

Specifications of E-L6911C

• Internal Switch(s): No
• Synchronous Rectifier: Yes
• Number Of Outputs: 1
• Voltage - Output: 1.3 ~ 3.5 V
• Current - Output: 1.3A
• Frequency - Switching: 200kHz
• Voltage - Input: 5 ~ 12 V
• Operating Temperature: -40°C ~ 150°C
• Mounting Type: Surface Mount
• Package / Case: 20-SOIC (7.5mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

L6911C
Figure 9. Voltage regulation with droop function block scheme
It results:
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 70 m 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
14/20
+5 VIN
+12Vcc
GNDIN
GND12
Z
OUT
V com p
S1
S2
S3
S4
S5
F1
C17
C16
=
--------------- -
I
LO AD
L1
V
R1
o
VID0
VID1
VID2
VID3
VID4
GND
D1
VCC
OSC
=
SS
R
18
11
4
5
6
7
8
3
20
15
d
9
L6911C
C19
A v(s)
1
----------------- -
1
U1
R (s )
C18
+
+
R5
R2
s
s
19
10
14
13
17
16
12
L
d
2
1
C20
OCSET
UGATE
PHASE
LGATE
PGND
PGOOD
VSEN
---------------------------- -
1
G1
R3
C24
R4
G
+
LO O P
G
L O O P
R13
R14
C23
Q8
R7
Q1-2
Q4-5
R
V out
=
OUT
R
C21-22
D2
OUT
1
1
R8
s
s
C25
R9
L2
d
L
1
------------------
1
+
+
C6-15
s
s
C1-5
L
d
Iout
L6911-L6912 EVALUATION KIT REV.
R12
VOUTCORE
GNDCORE
PWRGD