ANPEC APA2020 Service Manual

APA2020KI-TR

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

A P A 2 0 2 0

P a c k a g e C o d e

K : S O P

R : T S S O P - P *

T e m p . R a n g e

L e a d F re e C o d e

I : - 4 0 to 8 5 ° C

H a n d lin g C o d e

H a n d lin g C o d e

T U : T u b e

T R : T a p e & R e e l

T e m p . R a n g e

T Y : T ra y

P a c k a g e C o d e

L e a d F re e C o d e

L : L e a d F re e D e v ic e B la n k : O rig in a l D e v ic e

A P A 2 0 2 0 K :

A P A 2 0 2 0

X X X X X - D a te C o d e

X X X X X

A P A 2 0 2 0 R :

A P A 2 0 2 0

X X X X X - D a te C o d e

X X X X X

* 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.	1	www.anpec.com.tw
Rev. A.8 - Nov., 2002

APA2020

Block Diagram

M U X
M U X
M U X	SE/BTL

Absolute Maximum Ratings

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

Symbol	Parameter	Rating	Unit
VCC	Supply Voltage	6	V
TA	Operating Ambient Temperature Range	-40 to 85	° C
TJ	Maximum Junction Temperature	150	° C
TSTG	Storage Temperature Range	-65 to +150	° C
TS	Soldering Temperature,10 seconds	300	° C
VESD	Electrostatic Discharge	-3000 to 3000 *1	V
		-200 to 200 *2
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

Copyright ANPEC Electronics Corp.	2	www.anpec.com.tw
Rev. A.8 - Nov., 2002

APA2020

Recommended Operating Conditions

			Min.	Typ.	Max.	Unit
Supply Voltage, VDD			3	5	5.5	V
	VDD=5V,	4-Ω stereo BTL drive,
Operating free-air	250mW/Ch average power,	with proper PCB	-20		85	° C
temperature, TA		design
	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	VDD=5 V		1.25		4.5
input voltage, VICM						V
	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		APA2020			Unit
			Min.		Typ.	Max.
P(out)	Output power (each channel )	THD = 10% , BTL , RL=4Ω			2.3
	see Note 1	RL=8Ω			1.5
							W
		THD = 1% , BTL , RL=4Ω			1.8
		RL=8Ω			1.2
		THD = 10% , SE , RL=4Ω			650
		RL=8Ω			400
		THD = 1% , SE , RL=4Ω			500		mW
		RL=8Ω			320
		THD = 0.5% , SE , RL=32 Ω			90
THD + N	Total harmonic distortion plus	PO = 1.6W , BTL , RL=4Ω			300
	noise	PO = 1W , BTL , RL=8Ω			150
							m%
		PO = 78mW , SE ,RL=32Ω			20
		V1 = 1V , RL=4Ω , G = 1			10
BOM	Maximum output power	G = 10 , THD < 1%			>20		KHz
	bandwidth
	Phase margin	RL = 4Ω , BTL			72
		RL = 4Ω , Open Load			71		°
		RL = 4Ω , SE			52

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

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Rev. A.8 - Nov., 2002

APA2020

Electrical Characteristics (Cont.)

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

Symbol	Parameter	Test Condition		APA2020			Unit
			Min.		Typ.	Max.
PSRR	Power supply ripple rejection	f =100 Hz			80		dB
	Mute attenuation				85		dB
	Channel-to-channel output				85		dB
	separation
	Line HP input separation				75		dB
	BTL attenuation in SE mode				80		dB
ZI	Input impedance				2		MW
	Signal-to-noise ratio	Po = 500 mW , BTL			90		dB
Vn	Output noise voltage				80		ì V(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	Test Condition		APA2020			Unit
			Min.		Typ.	Max.
P(out)	Output power (each channel )	THD = 10% , BTL , RL=4Ω			1
	see Note 2	RL=8Ω			0.6
							W
		THD = 1% , BTL , RL=4Ω			0.8
		RL=8Ω			0.5
		THD = 10% , SE , RL=4Ω			290
		RL=8Ω			180
		Ω			230		mW
		THD = 1% , SE , RL=4
		RL=8Ω			140
		THD = 0.5% , SE , RL=32 Ω			43
THD + N	Total harmonic distortion plus	PO = 1.6W , BTL , RL=4Ω			270
	noise	PO = 1W , BTL , RL=8Ω			150
							m%
		PO = 78mW , SE ,RL=32Ω			20
		V1 = 1V , RL=4Ω , G = 1			10
BOM	Maximum output power	G = 10 , THD < 1%			>20		KHz
	bandwidth
	Phase margin	RL = 4Ω , BTL			92
		RL = 4Ω , Open Load			70		°
		RL = 4Ω , SE			57

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

Copyright ANPEC Electronics Corp.	4	www.anpec.com.tw
Rev. A.8 - Nov., 2002

APA2020

Electrical Characteristics (Cont.)

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

Symbol	Parameter	Test Condition		APA2020			Unit
			Min.		Typ.	Max.
PSRR	Power supply ripple rejection	f =100 Hz			70		dB
	Mute attenuation				85		dB
	Channel-to-channel output	f =1 KHz			85		dB
	separation
	Line HP input separation				75		dB
	BTL attenuation in SE mode				80		dB
ZI	Input impedance				2		MW
	Signal-to-noise ratio	Po = 500 mW , BTL			90		dB
Vn	Output noise voltage				50		ì V(rms)

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

DC Electrical Characteristic , TA=25 °C

Symbol	Parameter		Test Conditions		APA2020		Unit
					Typ.	Max.
IDD	Supply Current	V DD	= 5V	Stereo BTL	8	11	mA
				Stereo SE	4	6.5	mA
		V DD	= 3.3 V	Stereo BTL	7	9	mA
				Stereo SE	3.5	5.6	mA
VO (DIFF)	DC Differential Output	V DD =5V, Gain		= 2, see Note3	5	25	mV
	Voltage
IDD(MUTE)	Supply Current in Mute Mode	V DD	= 5V		8	11	mA
ISD	IDD in Shutdown	V DD	= 5V		0.5	5	A

Note 3 : at 3V<VDD<5V , the DC output voltage is approximately VDD / 2.

Copyright ANPEC Electronics Corp.	5	www.anpec.com.tw
Rev. A.8 - Nov., 2002

APA2020

Pin Description

					1	24				G N D / H S
G N D / H S
					2
T J						23				N C
					3	22				R O U T +
L O U T +
										RLINEIN
LLINEIN					4	21
LHPIN					5	20				RHPIN
LBYPASS					6	19				RBYPASS
LV DD					7	18				R V DD
S H U T D O W N					8	17				N C
MUT E OUT					9	16
										HP/LINE
LOUT -					10	15				R O U T -
MUTE IN					11	14				SE/BTL
G N D / H S					12	13				G N D / H S

Thermal Pad

Top View

Bottom View

For SOP and TSSOP-P

For TSSOP-P Only

Pin

I/O

Description

Nam e

No

GND/HS

1,12,

Ground connection for circuitry, directly connected to thermal pad

13,24

(only in TSSOP-P package).

TJ

2

O

Shutdown mode control signal input, sources a current proportional

to the junction temperature. This pin should be left unconnected

during normal operation. For more information, see the junction

temperature measurement section of this document.

LOUT +

3

O

Left channel + output in BTL mode, + output in SE mode.

L LINE IN

4

I

Left channel line input, selected when HP/

pin (16) is held low.

LINE

LHP IN

5

I

Left channel headphone input, selected when HP/

pin (16) is

LINE

held high.

LBYPASS

6

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

LVDD

7

I

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

SHUTDOWN

8

I

Shutdown mode control signal input, places entire IC in shutdown

mode when held high, IDD= 0.5 A.

MUTE OUT

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.

14

I

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

SE/BTL

mode.

ROUT-

15

O

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

mode.

HP/

16

I

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

LINE

hold low to select line inputs (4,21).

Copyright ANPEC Electronics Corp.

6

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Rev. A.8 - Nov., 2002

APA2020

Pin Description (Cont.)

Pin		I/O
			Description
Name	No
NC	17,23		No internal connection.
RVDD	18	I	Supply voltage input for right channel.
RBYPASS	19		Connect to voltage divider for right channel internal mild-supply
			bias.
RHP IN	20	I	Right channel headphone input, selected when HP/				pin (16) is
						LINE
			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, + output in SE mode.

Test Information

R F

C I R I

4.7µ F

M U X	Ω	, 8Ω	or 32 Ω
R L=4
C B
SE/BTL
HP/LINE

Figure 2. BTL Test Circuit

	C O
	RF
	M U X
C I	RI
4.7µ F	VDD
	C B
	SE/BTL
	HP/LINE

Figure 3. SE Test Circuit

R L= 4 Ω , 8 Ω or 32 Ω

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.	7	www.anpec.com.tw
Rev. A.8 - Nov., 2002

APA2020

Typical Characteristics

Noise	1 0
	5	VDD=5V
		f=1 KHz
+
Distortion	2	BTL
	1
	%
Harmonic	0.5			RL=8Ω		RL=3Ω
	0.2
Total	0.1
	0.06
THD+N-	0	5 0 0 m	1	1.5	2	2.5	3
				W
			Po - Output Power
				Figure 4

Noise	10
	5	VDD=5V
		AV=2
+		RL=4Ω
Distortion	2
		BTL
	1
	%	P O =1.8W, RL =3Ω	P O =0 . 25W
	0.5
Harmonic
	0.2
		P O =0.75W		PO =1 . 5W
	0.1
Total
	0.06
THD+N-	20	50 100 200 500 1k 2k		5k	20k
		Hz
		f - Frequency
		Figure 6

Noise	10	VDD=5V
	5	PO=1.5W
+		RL=4Ω
Distortion
	2	BTL
	1	A V =20 A V =10		A V =2
	%
Harmonic	0.5
	0.2	A V =2	P O =1.8W, RL =3Ω
Total	0.1
	0.06
THD+N-	20	50 100 200 500 1k 2k			5k	20k
			Hz
			f - Frequency
			Figure 5

	Noise	10	VDD=5V
		5
			RL=3Ω
	+		BTL
	Distortion
		2
		1
		%		f=20KHz
	Harmonic	0.5
		0.2		f=1KHz		f=20Hz
		0.1
	Total
		0.06
		1 0 0 m 2 0 0 m		5 0 0 m 1	2	5	10
	THD+N-
				W
				Po - Output Power
				Figure 7

Copyright ANPEC Electronics Corp.	8	www.anpec.com.tw
Rev. A.8 - Nov., 2002