15/29

L6910 - L6910A

6.5 APPLICATION SUGGESTIONS FOR HIGHER CURRENTS

For higher output currents, up to 20A, the following configuration can be used (with reference to the demo board

schematic):

Q1,Q2,Q3: STS11NF30L

Q4,Q5,Q6: STS17NF3LL

L: 2.5

µH Magnetic 77121A7 Core 7T 2x AWG16

In these conditions, the following performance have been achieved:

Table 8.

For currents higher than 20A, bigger mosfets should be selected (e.g. STS25NH3LL) both for the high side and

low side (depending on the duty cycle and input voltage).

7

6A DEMO BOARD DESCRIPTION

A compact demo board has been realized to manage currents in the range of 5A-6A .

The external power mosfets are included in a single SO8 package to save space and increase power density.

voltage available on the demo board. In case of input voltage higher than 7V (PGOOD Pin Maximum Ab-

solute Rating) a 5V reference is required.

Figure 17. 6A Demo Board Schematic

η (%)

η (%)

5

1.2

20

81

12

1.2

20

80

5

1.5

20

83

12

1.5

20

83

5

1.8

20

85

12

1.8

20

85

5

2.5

20

89

12

2.5

20

88

5

3.3

20

91

12

3.3

20

91

12

5

20

93

L1

R7

C1- C2

C7

C3-4

Q1/Q1

D2

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

VFB

COMP

C19

R10

C9

C6

D1

GNDOUT

GNDIN

R2

C8

C5

R6

C18

8

GNDCC

VCC

R5

J1

R3

R4

C20

EAREF

BOOT

R1

C10

R11

Q2/Q1

R8

R9

L1

R7

C1- C2

C7

C3-4

Q1/Q1

D2

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

VFB

COMP

C19

R10

C9

C9

C6

D1

GNDOUT

GNDIN

GNDIN

R2

C8

C5

R6

C18

8

GNDCC

VCC

R5

J1

R3

R4

R4

C20

C20

EAREF

BOOT

R1

C10

R11

Q2/Q1

R8

R9