LV56801P

No.A1901-10/14

• ILM output voltage setting method

Formula for ILM voltage calculation

Example : ILM = 9V setting method

The ILM_F voltage is determined by the

internal band gap voltage of the IC (typ = 1.26V).

When R3 = 150k, the ILM output voltage will be as follows:

• AUDIO output voltage setting method

Formula for AUDIO voltage calculation

The circuit must be designed in such a way that the R1:R2 ratio

satisfies the formula given above for the AUDIO voltage that

has been set.

Example : AUDIO = 8.5V setting method

The AUDIO_F voltage is determined by the

internal band gap voltage of the IC (typ = 1.26V).

Note : In the above, the typical values are given in all instances for the values used and, as such, they will vary due to the

effects of production-related variations of the IC and external resistors.

V

V

V

AUDIO

8.49

1.26

5.74

1.26

≅

+

×

=

V

V

k

k

V

ILM

8.94

1.26

Ω

42.69

Ω

7

1.26

≅

+

×

=

ILM

ILM_F

Z1=R2/R3

R3

R2

59.67k

Ω

1.26V

R1

7k

Ω

1

2

3

2

3

2

3

2

1

//

R

R

R

R

R

R

Z

+

⋅

=

=

]

[

26

.

1

]

[

1.26

1

1

V

Z

R

V

ILM

+

×

=

(

)

1.26

1.26

1

1

R

ILM

Z

⋅

−

=

1

2

1

2

3

Z

R

Z

R

R

−

⋅

=

(

)

Ω

43

1.26

Ω

7

1.26

9

1

k

V

k

V

V

Z

≅

⋅

−

=

Ω

42.69

Ω

150

Ω

59.67

Ω

150

Ω

59.67

1

k

k

k

k

k

Z

≅

+

⋅

=

′

AUDIO

AUDIO_F

R1

1.26V

R2

5

4

]

1.26[

]

1.26[

1

2

V

R

R

V

AUDIO

+

×

=

(

)

1.26

1.26

2

1

−

=

AUDIO

R

R

(

)

5.75

1.26

1.26

8.5

2

1

≅

−

=

R

R

5.74

Ω

4.7

Ω

27

2

1

≅

=

k

k

R

R