Diodes PAM8124 User Manual

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PAM8124

Description

The PAM8124 is a 15W efficient, Class-D audio power amplifier for

driving stereo speakers in a single-ended configuration; or a mono

speaker in a bridge-tied-load configuration. The PAM8124 can drive

stereo speakers (SE) as low as 4Ω. Due to the low power dissipation

and high efficiency, up to 95%, the device can be used without any

external heat sink when playing music.

The gain of the amplifier is controlled by 2 gain selectable pins,

offering 20dB, 26dB, 32dB, and 36dB gain selections.

The PAM8124 is available in a TSSOP-24-EP package.

NEW PRODUCT

Features

• 30W/Ch into 8Ω BTL Load from 22V Supply

• 15W/Ch into 4Ω SE Load from 22V Supply

• 10W/Ch into 8Ω SE Load from 24V Supply

• Operate from 10V to 26V

• Single-Ended Analog Inputs

• Supports Multiple Output Configurations:

 2-Ch Single-Ended (SE, Half-Bridge)

 1-Ch Bridge-Tied Load (BTL, Full-Bridge)

• Four Selectable Fixed-gain Settings

• No Pop Noise for Start-up and Shut-down Sequences

• Internal Oscillator (No External Components Required)

• High Efficient Class-D Operation Eliminates Need for Heat Sinks

• Thermal and Short-Circuit Protection with Auto Recovery

• Space-Saving Surface-Mount TSSOP-24EP Package

• Pb-Free Package

Pin Assignments

PVCCL

SDN

PVCCL

MUTE

LIN

RIN

VCM
AGND
AGND

PVCC R

VCLAMP

PVCCR PGNDR

Applications

• Televisions

• Home Sound Systems

• Active Speakers

HIGH POWER AUDIO

TSSOP-24-EP

1
2
3

4

XXXYWWLL

PAM8124

5
6
7
8
9

10
11
12 13

24

23

22

21

20
19
18
17
16
15
14

PGNDL

PGNDL
LOUT
BSL
AVCC
SE_BTL

GAIN 0

GAIN1

BSR

ROUT

PGNDR

Typical Applications Circuit

U1

10V_to_26V

SD

Mute

L_in

R_i n

10V_to_26V

1

PVCCL

2

SDN

3

PVCCL

4

MUTE

5

LIN

6

RIN

7

C1
1uF

C3
1uF

VCM

8

AGND

9

AGND

10

PVCCR

11

VCL A M P

12

PVCCR

PAM8124

PGNDL

PGNDL

LOUT

BSL

AVCC

SE_BT L

GAIN0

GAIN1

BSR

ROUT

PGNDR

PGNDR

24

23

22

21

C2 1uF

20

19

18

17

16

C4 1uF

15

14

13

L1

33uH

10V_to_26V

SE_BT L

G0

G1

L2

33uH

C5
220nF

C6
220nF

R1

4.7K

R2

4.7K

C7
470uF

C8
470uF

L_out1

8ohm

8ohm

R_out1

PAM8124

Document number: DS36627 Rev. 1 - 2

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Pin Descriptions

Pin Name I/O/P Function

1, 3 PVCCL P Power supply for left channel H-bridge, not connected to PVCCR or AVCC

2 SDN I Shutdown signal for IC (low = shutdown, high = operational). TTL logic levels with compliance to AVCC

4 MUTE I

5 LIN I Audio input for left channel

6 RIN I Audio input for right channel

7 VCM O Reference for analog cells

8, 9 AGND P Analog ground for digital/analog cells in core

10, 12 PVCCR P Power supply for right channel H-bridge, not connected to PVCCL or AVCC

NEW PRODUCT

11 VCLAMP P

13, 14 PGNDR P Power ground for right channel H-bridge

15 ROUT O Class-D H-bridge output for right channel

16 BSR I/O Bootstrap I /O for right channel H-bridge

17 GAIN1 I Gain select most-significant bit. TTL logic levels with compliance to AVCC

18 GAIN0 I Gain select least-significant bit. TTL logic levels with compliance to AVCC

19 SE_BTL I

20 AVCC P High-voltage analog power supply

21 BSL I/O Bootstrap I /O for left channel H-bridge

22 LOUT O Class-D H-bridge output for left channel

23, 24 PGNDL P Power ground for left channel H-bridge

Functional Block Diagram

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PAM8124

A logic high on this pin disables the outputs. A low on this pin enables the outputs. TTL logic levels with
compliance to AVCC

Internally generated voltage supply for bootstrap. Not to be used as a supply or connected to any
component other than the decoupling capacitor.

A logic low on this pin enables one single-ended input in BTL configuration. A logic high on this pin
enables two inputs in SE/BTL configuration. TTL logic levels with compliance to AVCC

PAM8124

Document number: DS36627 Rev. 1 - 2

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PAM8124

Absolute Maximum Ratings (@T

Parameter Rating Unit

Supply Voltage (VCC) 28 V

Logic Input Voltage (SDN, MUTE, GAIN0, GAIN1, SE_BTL)

Analog Input Voltage (LIN, RIN) -0.3 to +5.5 V

Storage Temperature -65 to +150 °C

Maximum Junction Temperature 150 °C

Junction to ambient thermal resistance 40 °C/W

Recommended Operating Conditions (@T

NEW PRODUCT

Symbol Parameter Min Max Unit

VCC

TA

TJ

Operating Ambient Temperature Range

Electrical Characteristics (@T

Symbol Parameter Test Conditions Min Typ Max Units

|VOS|

I

CC(q)

I

CC(MUTE)

I

CC(SDN)

R

DS(ON)

G Gain

Mute Attenuation Vi = 1Vrms -60 dB

PSRR Power Supply Rejection Ratio

PO

THD+N Total harmonic distortion + noise

Vn Output integrated noise floor

Cs Crosstalk

SNR Signal-to-noise ratio THD+N<1%, f = 1kHz, Gain = 20dB 92 dB

OTP Thermal trip point 160 °C

OTH Thermal hysteresis 60 °C

fosc Oscillator frequency

PAM8124

Document number: DS36627 Rev. 1 - 2

Class-D output offset voltage(measured
differently)

Quiescent supply current SDN = 2.5V, MUTE = 0V, No Load 25 40 mA

Quiescent supply current in mute mode MUTE = 2.5V, No load 25 40 mA

Quiescent current in shutdown mode SDN = 0.8V, No load 30 60 µA

Drain-source on-state resistance

Output Power at 1% THD+N

Output Power at 10% THD+N

= +25°C, unless otherwise specified.)

A

-0.3 to V

= +25°C, unless otherwise specified.)

A

Supply Voltage 10 26 V

Junction Temperature Range

= +25°C, VCC = 24V, Gain = 20dB, RL = 8Ω unless otherwise specified.)

A

= 0V, AV = 36dB

V

i

IO = 0.5A

GAIN1 = 0.8V, GAIN0 = 0.8V 18 20 22

GAIN1 = 0.8V, GAIN0 = 2.5V 24 26 28

GAIN1 = 2.5V, GAIN0 = 0.8V 30 32 34

GAIN1 = 2.5V, GAIN0 = 2.5V 34 36 38

V

= 200mVpp,

RIPPLE

f = 1kHz,gain = 20dB

= 4Ω, f = 1kHz

R

L

RL = 8Ω, f = 1kHz

= 4Ω, f = 1kHz

R

L

RL = 8Ω, f = 1kHz

=4Ω, f = 1kHz, Po = 10W

R

L

RL = 8Ω, f = 1kHz, Po = 5W

20Hz to 22kHz, A-weighted,
Gain = 20dB

P

= 1W, f = 1kHz, Gain = 20dB

O

SE_BTL = 2.5V 250 300 350

SE_BTL = 0.8V 360

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+0.3

CC

-40 +85 °C

-40 +125 °C

20 100 mV

150 mΩ

-52 dB

14

8

18

10

0.15

0.08

200 µV

-70 dB

V

dB

W

%

kHz

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PAM8124

Performance Characteristics (@T

20

10

5

2

1

%

0.5

0.2

NEW PRODUCT

0.1

0.06

1m 302m 5m 10m 20m 50m 100m 200m 500m 1 2 5 10 20

20

10

5

2

1

%

0.5

0.2

0.1

0.05

0.03
20 20k50 100 200 500 1 k 2k 5k 10k

20

10

5

2

1

%

0.5

0.2

0.1

0.05

0.03
1m 502m 5m 10m 20m 50m 100m 200m 500m 1 2 5 10 20

PAM8124

Document number: DS36627 Rev. 1 - 2

THD+N vs. Output Power (RL = 4Ω, SE)

W

THD+N vs. Frequency (R

L

PO = 2W/ 5W/ 8W
(Red / Blue/ Pink)

Hz

THD+N vs. Output Power (R

W

= +25°C, VCC = 24V, f = 1kHz, Gain = 20dB unless otherwise specified.)

A

THD+N vs. Output Power (R

20

10

5

2

1

%

0.5

0.2

0.1

0.05

0.03
1m 202m 5m 10m 20m 50m 100m 200m 500m 1 2 5 10

= 4Ω, SE)

%

0.5

0.2

0.1

0.05

0.02

THD+N vs. Frequency (R

20

10

PO = 1W/ 2W/ 6W
(Red / Blue/ Pink)

5

2

1

20 20k50 100 200 500 1k 2k 5k 10k

= 8Ω, BTL)

L

20

10

0.5

%

0.2

0.1

0.05

0.02

0.01

THD+N vs. Frequency (R

PO = 5W/ 10W/ 15W

5

(Red / Blue/ Pink)

2

1

20 20k50 100 200 500 1k 2k 5k 10k

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W

Hz

L

= 8Ω, SE)

L

Hz

= 8Ω, BTL)

L

= 8Ω, SE)

October 2013

© Diodes Incorporated

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(

Performance Characteristics (@T

Crosstalk vs. Frequency (RL = 4Ω, SE)

PO = 1W
L to R/ R to L

Red /Blue)

20 20k50 100 200 500 1k 2k 5k 10k

PSRR vs. Frequency (R

TT

PSRR vs. Frequency (R

NEW PRODUCT

+0

-5

-10

-15

-20

-25

-30

-35

-40

-45

d

-50

B

-55

-60

-65

-70

-75

-80

-85

-90

-95

-100

+0

-5

-10

-15

-20

-25

-30

-35

d

-40

B

-45

-50

-55

-60

-65

-70

-75

-80
20 20k50 100 200 500 1k 2k 5k 10k

+0

TTT TT T

-5

-10

-15

-20

-25

-30

-35

d

-40

B

-45

-50

-55

-60

-65

-70

-75

-80
20 20k50 100 200 500 1k 2k 5k 10k

Hz

Hz

L

Hz

= +25°C, VCC = 24V, f = 1kHz, Gain = 20dB unless otherwise specified.)

A

= 4Ω, SE)

L

= 8Ω, BTL)

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+0

-5

-10

-15

-20

-25

-30

-35

-40

-45

d

-50

B

-55

-60

-65

-70

-75

-80

-85

-90

-95

-100
20 20k50 100 200 500 1k 2k 5k 10k

TT

PO = 1W
L to R/ R to L
(Red / Blue)

PSRR vs. Frequency (R

Crosstalk vs. Frequency (R

+0

TTT

-5

-10

-15

-20

-25

-30

-35

d

-40

B

-45

-50

-55

-60

-65

-70

-75

-80

20 20k50 100 200 500 1k 2k 5k 10k

Noise Floor (RL = 8Ω, SE)

+0

-10

-20

-30

-40

-50

d

-60

B

r

-70

A

-80

-90

-100

-110

-120

-130
20 20k50 100 200 500 1k 2k 5k 10k

Hz

Hz

Hz

= 8Ω, SE)

L

= 8Ω, SE)

L

PAM8124

PAM8124

Document number: DS36627 Rev. 1 - 2

5 of 15

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October 2013

© Diodes Incorporated