L6911D

14/17

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.

Application Idea: 1.100V to 1.850V / 25A

Figure 10 shows an application schematic for a 1.100V to 1.850V conversion with 25A of current capability.

Since the device's high gate drive, more than one mosfet for both high side and low side can be used: three

STS11NF30L (30V, 9mW typ @ Vgs=10V) mosfet are suggested for high side while four of them are suggested

as low side switch.

Figure 10. Schematic Circuit

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

+

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

⋅

==

=

L2

L1

R7

R8

R9

C1-3

C23

C4-9

C17

Q4,Q5,Q6

Q1,Q2, Q3

D2

C17

F1

16

17

13

14

2

4

5

6

7

8

U1

L6911D

+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

VFB

COMP

R3

R4

R5

R2

C18

C19

C20

VID0

VID1

VID2

VID3

VID25mV

C24

D1

R6

R1

OVP

R10

C16

PWRGD

R15

R14

R13

C21-22

BOOT