AN2622

Description of the evaluation board

3/5

Caution:

When you apply the power supply through P2, do not invert the polarity because it would

destroy the amplifier at U1.

Figure 1.

Schematic diagram

VCC

1uF

C6

100nF

C7

VCC

1

2

3

P1

20k

R1

20k

R3

20k

R2

20k

R4

1uF

C5

VCC

220uF

C8

220uF

C9

1

2

3

4

P5

Input

1

2

P2

Vcc

VCC

1

2

3

P4

OUT1/SE

OUT1/PHG

PHG

PHG

OUT2/PHG

OUT2/SE

1

2

3

4

5

6

7

8

P3

Output

GND

GND

C4

C2

Input1

GND

GND

Input2

330nF

C1

330nF

C3

Jumper J1

Jumper J2

SE

ON

Standby

PHG

1k

R6

1k

R5

Vin1

1

Vin2

5

Vout2

7

Vout1

9

BIAS

BPS

4

Vout3

8

STDB

2

U1

TS4909 DFN10

Cn2

Cn1

3

5

4

2

1

Cn3

SE Output

Table 3.

Component list for the evaluation board

Designation

Quantity

Description

C1, C3

2

330nF/16V, ceramic capacitors, 0805

C2, C4

0

Not connected, 0603

C7

1

100nF/16V, ceramic capacitors, 0805

C5, C6

2

1

μF/50V, electrolytic capacitor

C8, C9

2

220

μF/10V, electrolytic capacitor

P2

1

2-pin header 2.54mm pitch

P3, P4

2

3-pin header 2.54mm pitch

P3

1

8-pin header 2.54mm pitch

P5

1

4-pin header 2.54mm pitch

J1, J2

2

Jumper, 2.54mm pitch

Cn1, Cn2

2

Not connected, phono plug

Cn3

1

Not connected, stereo headphone jack 3.5

U1

1

TS4909