ANPEC APA2020 Service Manual

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APA2020

Stereo 2-W Audio Power Amplifier

Features

••

• Depop Circuitry Integrated

••

••

• Thermal Shutdown Circuitry Integrated

••

••

• Output Power at 1% THD+N, VDD=5V

••

- 1.8 W/Ch (typ) into a 4 Ω Load

- 1.2 W/Ch (typ) into a 8 Ω Load

••

• Bridge-Tied Load (BTL) or Single-Ended

••

(SE) Modes Operation

••

• Various 24-Pin Power Packages Available

••

SOP, TSSOP-P

••

• Shutdown Control Mode , IDD= 0.5µA

••

Applications

••

• Stereo Audio Power Amplifier for Notebook

••

Computer

General Description

The APA2020 is a stereo bridge-tied audio power am­plifier in various 24-pin power packages , including
SOP , TSSOP-P. When connecting to a 5V voltage
supply , the APA2020 is capable of delivering 1.8W/

1.2W of continuous RMS power per channel into 4Ω/
8Ω loads with less than 1% THD+N , respectively.
The APA2020 simplifies design and frees up board
space for other features.

The APA2020 also served well in low-voltage
applications , which provides 800-mW per channel
into 4Ω loads with a 3.3V supply voltage. Both of the
depop circuitry and the thermal shutdown protection
circuitry are integrated in the APA2020 , that reduces
pops and clicks noise during power up and when
using the shutdown or mute modes and protects the
chip from being destroyed by over-temperature
failure.
To simplify the audio system design in notebook
computer applications , the APA2020 combines a
stereo bridge-tied loads (BTL) mode for speaker drive
and a stereo single-end (SE) mode for headphone
drive into a single chip , where both modes are easily
switched by the SE/BTL input control pin signal. For
power sensitive applications , the APA2020 also
features a shutdown function which keeps the supply
current only 0.5 µA (typ).

Ordering and Marking Information

APA 2020

Lead Free Code
Handling Code
Tem p. Range
Package C ode

AP A2020 K :

AP A2020 R :

APA2020
XXXXX

APA2020
XXXXX

* TSSOP-P is a standard TSSOP package with a thermal pad exposure on the bottom of the package.

ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and advise
customers to obtain the latest version of relevant information to verify before placing orders.

Copyright  ANPEC Electronics Corp.
Rev. A.8 - Nov., 2002

Package C ode
K : SOP R : TSSOP-P *
Tem p. Range
I : - 4 0 to 8 5 C
Handling C ode
T U : T u b e T R : T a pe & R e e l
T Y : T ra y
Lead Free Code
L : L ea d F re e De v ic e B la n k : O rig in a l D e vic e

XX X X X - D ate Co d e

XX X X X - D ate Co d e

°

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APA2020

Block Diagram

MUX

MUX

MUX SE/BTL

Absolute Maximum Ratings

(Over operating free-air temperature range unless otherwise noted.)

Symbol Parameter Rating Unit

V

CC

T

A

T

J

T

STG

T

S

V

ESD

Note: 1. Human body model : C=100pF , R=1500Ω , 3 positive pulses plus 3 negative pulses

2. Machine model : C=200pF , L=0.5mH , R=0Ω , 3 positive pulses plus 3 negative pulses

Supply Voltage 6 V
Operating Ambient Temperature Range -40 to 85

Maximum Junction Temperature 150
Storage Temperature Range -65 to +150
Soldering Temperature,10 seconds 300
Electrostatic Discharge -3000 to 3000

-200 to 200

*1

*2

C

°

C

°

C

°

C

°

V

Copyright  ANPEC Electronics Corp.
Rev. A.8 - Nov., 2002

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APA2020

Recommended Operating Conditions

Min. Typ. Max. Unit

Supply Volt age , V

DD

355.5V

VDD=5V, 4-Ω stereo BTL drive,

Operating free-air
temperature, T

A

250mW/Ch average power, with proper PCB
design

-20 85

VDD=5V, 3-Ω stereo BTL drive,
2 W/Ch average power, with proper PCB design

-20 85
and 300 CFM
forced-air cooling

Common mode
input voltage, V

VDD=5 V 1.25 4.5

ICM

VDD=3.3V 1.25 2.7

Electrical Characteristics (Cont.)

AC Operating Characteristics , VDD= 5V , TA= 25°C , RL= 4Ω (unless otherwise noted)

Symbol Parameter Test Condition

P(out) Output power (each channel )

see Note 1

THD = 10% , BTL , RL=4

R

THD = 1% , BTL , RL=4

R

THD = 10% , SE , RL=4

R

THD = 1 % , SE , R

R

THD = 0.5% , SE , R

THD + N Total harmonic distortion plus

noise

PO = 1.6W , B T L , RL=4

P

= 1W , B T L , RL=8

O

P

= 78mW , SE ,RL=32

O

L

L

L

=4

L

=8

L

=32

L

=8

=8

=8

Min. Typ.Max.

Ω
Ω

Ω

Ω

Ω

Ω

Ω

Ω

Ω
Ω
Ω

Ω

APA2020

2.3

1.5

1.8

1.2

650
400

500
320

90

300
150

20

C

°

V

Unit

W

mW

m%

= 1V , RL=4

V

1

B

Maximum output power

OM

bandwidth
Phase margin

G = 10 , THD < 1% >20
RL = 4Ω , BTL

Ω ,

G = 1

RL = 4Ω , Open Load
R

= 4Ω , SE

L

Notes 1 : Output power is meaured at the output teminals of the IC at 1 KHz.

Copyright  ANPEC Electronics Corp.
Rev. A.8 - Nov., 2002

10

72
71

52

KHz

°

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APA2020

Electrical Characteristics (Cont.)

AC Operating Characteristics , VDD= 5V , TA= 25°C , RL= 4Ω (unless otherwise noted)

Symbol Parameter Test Condition

APA2020

Min. Typ.Max.

PSRR Power supply ripple rejection f =100 Hz 80 dB

Mute attenuation
Channel-to-channel output

separation
Line HP input separation
BTL attenuation in SE mode

ZI Input impedance

Signal-to-noise ratio Po = 500 mW , BTL

Vn Output noise voltage

85 dB
85 dB
75 dB

80 dB

2MW
90 dB
80 ìV(rms)

Notes 1 : Output power is meaured at the output teminals of the IC at 1 KHz.

Electrical Characteristics (Cont.)

AC Operating Characteristics , VDD= 3.3V , TA= 25°C , RL= 4Ω (unless otherwise noted)

Symbol Parameter T est Condition

P(out) Output power (each channel )

see Note 2

THD = 10% , BTL , RL=4

R

THD = 1% , B T L , RL=4

R

THD = 10% , SE , RL=4

R

THD = 1% , S E , R

R

THD = 0.5% , SE , R

THD + N Total harmonic distortion plus

noise

PO = 1.6W , BT L , RL=4
P

= 1W , BTL , RL=8

O

= 78mW , SE ,RL=32

P

O

L

L

=4

L

=8

L

=32

L

=8

L

=8

=8

Ω
Ω

Ω

Ω

Ω

Ω

Ω

Ω

Ω

Ω

Ω

Ω

APA2020

Min. Typ.Max.

1

0.6

0.8

0.5

290

180

230

140

43

270

150

20

Unit

Unit

W

mW

m%

= 1V , RL=4

V

1

B

Maximum output power

OM

bandwidth
Phase margin

G = 10 , THD < 1% >20 KHz
RL = 4Ω , BTL

Ω ,

G = 1

RL = 4Ω , Open Load
R

= 4Ω , SE

L

Notes 2 : Outp ut power is m eaured at the o utput teminals of th e IC at 1 KHz.

Copyright  ANPEC Electronics Corp.
Rev. A.8 - Nov., 2002

10

92
70

57

°

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APA2020

Electrical Characteristics (Cont.)

AC Operating Characteristics , VDD= 3.3V , TA= 25°C , RL= 4Ω (unless otherwise noted)

Symbol Parameter Test Condition

APA2020

Min. Typ.Max.

PSRR Power supply ripple rejection f =100 Hz 70 dB

Mute attenuation
Channel-to-channel output

separation
Line HP input separation
BTL attenuation in SE mode

ZI Input impedance

Signal-to-noise ratio Po = 500 mW , BTL

Vn Output noise voltage

f =1 KHz

85 dB
85 dB
75 dB

80 dB

2MW
90 dB
50 ìV(rms)

Notes 2 : Output power is meaured at the output teminals of the IC at 1 KHz.

DC Electrical Characteristic , TA=25 °C

APA2020Symbol Parameter Test Conditions

= 5V

DD

I

DD

Supply Current

V

DD

= 3.3 V

Stereo BTL 8 11 mAV
Stereo SE 4 6.5 mA
Stereo BTL 7 9 mA

Typ. Max.

Stereo SE 3.5 5.6 mA

V

O (DIFF)

DC Di fferen tia l Output

=5V , Gain = 2, see Note3 5 25 mV

V

DD

Voltage

I

DD(MUTE)

I

SD

Supply Current in Mute Mode V
IDD in Shutdow n V

= 5V 8 11 mA

DD

= 5V 0.5 5

DD

Unit

Unit

A

µ

Note 3 : at 3V<VDD<5V , the DC output voltage is approximately V

Copyright  ANPEC Electronics Corp.
Rev. A.8 - Nov., 2002

DD

/ 2.

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APA2020

Pin Description

GND/HS

T

J

LOUT+

LLINEIN

LHPIN

LBYPASS

LV

SHUTDOWN

DD

MUTE OUT

LOUT-

MUTE IN

GND/HS

1

2
3
4
5
6

7
8
9

10
11
12

Top View

For SOP and TSSOP-P

Pin

Name No

GND/HS 1,12,

13,24

TJ 2 O

24
23
22
21
20

19
18
17
16

15
14
13

GND/HS
NC
ROUT+
RLINEIN
RHPIN
RBYPASS
RV

DD

NC
HP/LINE

ROUT­SE/BTL

GND/HS

Thermal

Pad

Bottom View

For TSSOP-P Only

I/O

Description

Ground connection for circuitry, directly connected to thermal pad
(only in TSSOP-P package).

Shutdown mode control signal input, sources a current proportional
to the junction temperature. This pin should be left unconnected
during norma l operation. For more information, see the junction
temperature measurem ent section of this document.

LOUT + 3 O Left channel + output in BTL m ode, + output in SE mode.

L LINE IN 4 I

LHP IN

5I

Left channel line input, selected when H P /

pin (16) is held low.

LINE

Left channel headphone input, selected when HP/

LINE

pin (16) is

held high.

LBYPASS 6 Connect to voltage divider for left channel internal mid-supply bias.

LV

DD

7 I Supply voltage input for left channel and for primary bias circuits.

SHUTDO W N 8 I Shutdown mode control signal input, places entire IC in shutdown

mode when held high, I

= 0.5µA.

DD

MUTE O U T 9 O Follows MUTE in pin (11), provides buffered output.

LOUT - 10 O Left channel - output in BTL mode, high-impedance state in SE

mode.

MUTE IN 11 I

Mute control signal input, hold low for normal operation, hold high to
mute.

SE/BTL

14 I Mode control signal input, hold low for BTL mode, hold high for SE

mode.

ROUT- 15 O

Right channel - output in BTL mode, high impedance state in SE
mode.

HP/

LINE

16 I MUX control input, hold high to select headphone inputs (5,20),

hold low to s ele c t line in pu ts (4 ,21).

Copyright  ANPEC Electronics Corp.
Rev. A.8 - Nov., 2002

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APA2020

Pin Description (Cont.)

Pin

Name No

I/O

Description

NC 17,23 No internal connection.

RV

DD

RBYPASS 19

18 I Supply voltage input for right channel.

Connect to voltage divider for right channel internal mild-supply
bias.

RHP IN 20 I

Right channel headphone input, selected when HP/
held high.

RLINE IN 21 I

Right channel line input, selected when HP/

pin (16) is held

LINE

low.

ROUT+ 22 O Right channel + output in BTL mode, + o utput in SE m od e.

Test Information

R

F

CIR

4.7µFC

MUX

I

B

SE/BTL

HP/LINE

RL=4 Ω , 8Ω or

32 Ω

CIR

4.7µF

R

F

MUX

I

C

B

SE/BTL
HP/LINE

LINE

V

pin (16) is

C

O

RL= 4
or 32

DD

Ω , 8 Ω

Ω

Figure 2. BTL Test Circuit

Customer Service

Anpec Electronics Corp.

Head Office :

5F, No. 2 Li-Hsin Road, SBIP,
Hsin-Chu, Taiwan, R.O.C.
Tel : [phone]
Fax : [phone]

Taipei Branch :

7F, No. 137, Lane 235, Pac Chiao Rd.,
Hsin Tien City, Taipei Hsien, Taiwan, R. O. C.
Tel : [phone]
Fax : [phone]

Copyright  ANPEC Electronics Corp.
Rev. A.8 - Nov., 2002

Figure 3. SE Test Circuit

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APA2020

Typical Characteristics

10

VDD=5V

5

f=1 KHz
BTL

2

1

%

0.5

0.2

0.1

0.06
0 3500m 1 1.5 2 2.5

THD+N- Total Harmonic Distortion + Noise

Po - Output Power

RL=8

ΩΩ

Ω

ΩΩ

W

RL=3

ΩΩ

Ω

ΩΩ

Figure 4

10

VDD=5V

5

PO=1.5W

ΩΩ

RL=4

Ω

ΩΩ

BTL

2

AV=20

1

%

0.5

0.2

0.1

0.06
20 20k50 100 200 500 1k 2k 5k

THD+N- Total Harmonic Distortion + Noise

AV=10 AV=2

PO=1.8W, RL=3

AV=2

Hz

f - Frequency

Ω

Figure 5

10

VDD=5V

5

AV=2

ΩΩ

RL=4

Ω

2

1

%

0.5

0.2

0.1

0.06

THD+N- Total Harmonic Distortion + Noise

ΩΩ

BTL

PO=1.8W, RL=3

20 20k50 100 200 500 1k 2k 5k

Ω

PO=0.75W PO=1.5W

Hz

PO=0.25W

f - Frequency

Figure 6

10

VDD=5V

5

RL=3

ΩΩ

Ω

ΩΩ

BTL

2

1

%

0.5

0.2

0.1

0.06

100m 10200m 500m 1 2 5

THD+N- Total Harmonic Distortion + Noise

f=20KHz

f=20Hzf=1KHz

W

Po - Output Power

Figure 7

Copyright  ANPEC Electronics Corp.
Rev. A.8 - Nov., 2002

www.anpec.com.tw8

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