L6911C

14/20

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

µm 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

Av(s)

R(s )

V out

Vco m p

Iout

d

s

L

s

OUT

R

τ

τ

⋅

+

⋅

+

⋅

1

1

Z

OUT

V

o

I

LO AD

----------------

R

d

1s

τ

L

+

1s

τ

d

+

------------------

G

LOOP

1G

L OOP

+

-----------------------------

⋅⋅

R

OUT

1s

τ

L

+

1s

τ

d

+

------------------

⋅

==

=

L6911-L6912 EVALUATION KIT REV.

L2

L1

R7

R8

R9

C1-5

C21-22

C23

C6-15

C25

Q4-5

Q1-2

D2

C17

F1

16

17

13

14

2

4

5

6

7

8

U1

L6911C

+5 VIN

+12Vcc

VOUTCORE

PWRGD

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

R1

C16

S1

S2

S3

S4

S5

C24

Q8

D1

GNDIN

GNDCORE

GND12

R12

R13

R14

G1