Tel: 886-2-66296288

Fax: 886-2-29174598

URL: http://www.princeton.com.tw

PT2001 PRE1.0

- 3 -

October , 2007

2.2W×2 Class-D Audio Power Amp.

with Headphone Output

Preliminary

PT2001

APPICATION CIRCUIT DIAGRAM

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

NC

INRP

INRN

VCC

HPIN

SD

REF

INLN

INLP

NC

OUTLP

GND

GNDL

VDDL

OUTLN

OUTRN

VDDR

GNDR

GND

OUTRP

C1

0.22uF

C2

0.22uF

C3

1uF

C4

1uF

C5

0.22uF

C6

0.22uF

C8

1uF

C7

1uF

C10

1nF

C11

1nF

C12

1nF

C13

1nF

C14

0.22uF

C15

0.22uF

R-IN

L-IN

L3

FB

L4

FB

L5

FB

L6

FB

L7

100uH

L8

100uH

2

3

1

11

10

U1

PHONEJACK

R3

82

R4

82

C16

220uF

C17

220uF

R5

1K

R6

1K

R1

150K

R2

150K

SW1

shutdown

L1

FB

L2

FB

C9

10uF

PT2001

SP1

R-SPEAKER

SP2

L-SPEAKER

+5V

Notes:

1. R3 and R4 is use to reduce gain when headphone is attached to the PT2001, recommend range is

from 56Ω to 82Ω value depends on headphone’s sensitivity. Larger resistance will limit the

maximum volume of headphone and also reduced residual noise.

2. Speaker Output CAN NOT use LC low pass filter because the chip would malfunction.

3. Parts List :

PTC Parts No.

Vendor‘s

Name

Component

Type

Vendor No.

Specification

L1, L2,

L3,L4,L5,L6

3L COILS

Ferrite Bead

SMB-201209-F2-121P

DCR<0.1Ω

Isat>3A,

Z=120Ω@100MHz

L7,L8

3L COILS

Inductor

SMTSDR322520C-101K

L=100µH, Isat=100mA