11/21

L6910A L6910

Figure 8. Asymptotic Bode plot of Converter's gain

20A Demo Board Description

The demo board shows the operation of the device in a general purpose application. This evaluation board al-

lows voltage adjustability from 0.9V to 5V through the switches S2-S5 according to the reported table when the

internal 0.9V reference is used (G1 closed). Output current in excess of 20A can be reached dependently on

the kind of mosfet used: up to three SO8 mosfet may be used for both High side and Low side switches. External

reference may be used for the regulation simply leaving open G1 and the switches S2-S5. The device may also

be disabled with the switch S1. The 12V input rail supplies the device while the power conversion starts from

the 5V input rail. The device is also able to operate with a single supply voltage; in this case the jumper G2 has

copper thickness is of 70

µm in order to minimize conduction losses considering the high current that the circuit

is able to deliver. Figure 9 shows the demo board's schematic circuit

Figure 9. 20A Demo Board Schematic

Error Amplifier

R5/R3

Modulator Gain

Compensation Network Gain

Error Amplifier

Closed Loop Gain

ω

dB

L2

L1

R7

C1 -C3

C14

C4 -11

Q4 -6

Q1 -3

D2

C17

F1

13

14

10

11

3

1

U1

L6910

VIN

VOUT

PWRGD

6

12

5

4

2

15

7

9

VCC

GND

VREF

SS

OSC

OCSET

UGATE

PHASE

LGATE

PGND

PGOOD

C19

R1

C21

C13

D1

GNDIN

GNDOU T

R2

GNDref

+Vref

C12

GNDRef

IN

Ref

IN

C16

G1

C15

R6

C18

8

GNDCC

VCC

R5

G2

R3

R4

C20

S1

S2

S3

S4

S5

R10

R11

R12

R13

EAREF

BOOT

Vout

S2 S3 S4 S5

0.9

1.2

1.5

1.8

2.5

3.3

5.0

Open Open

ON

Ope n Open

Open Open

Open Open

Open Open

Open Open

Open Open

Open Open

ON

ON

ON

Open

Open

ON

ON

ON

ON

Open

Open