SANYO LA4628 Datasheet

Ordering number : ENN6632

92900RM (OT) No. 6632-1/8

Overview

The LA4628 is a 2-channel general-purpose BTL audio
power amplifier provided in a miniature package. It was
designed for the best possible audio quality and features
an extended low band roll-off frequency provided by a
newly-developed NF circuit that does not require an
external capacitor. Furthermore, crosstalk, which can
cause muddiness in the audio output, has been
significantly reduced by both circuit and wiring pattern
improvements. Thus this amplifier can provide powerful
lows and clear highs.

Note that this device is pin compatible with the 13.5 W ×
2-channel LA4625, and allows end products differentiated
by their power rating to share the same printed circuit
board.

Features

• Total output: 20 W + 20 W (at VCC= 13.5 V, RL = 4 Ω,
THD = 10%)

• High-fidelity design (fL< 10 Hz, fH= 130 kHz)

• Extremely low impulse noise levels

• An arbitrary amplifier startup time can be set up with
external components.

• Full complement of built-in protection circuits (includes
circuits that protect against shorting to VCC, shorting to
ground, load shorting, overvoltages and excessive
temperatures)

Package Dimensions

unit: mm

3113A-SIP14HZ

27.0

20.0

R1.7

0.5

1.94

8.4

7.8

14.5max

14

1

0.4

11.8

5.2

4.6

1.6

2.2

4.0

1.78 3.56

3.56

SANYO: SIP14HZ

[LA4628]

LA4628

SANYO Electric Co.,Ltd. Semiconductor Company

TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN

Two-Channel 20 W BTL Audio Power Amplifier

Monolithic Linear IC

Any and all SANYO products described or contained herein do not have specifications that can handle
applications that require extremely high levels of reliability, such as life-support systems, aircraft’s
control systems, or other applications whose failure can be reasonably expected to result in serious
physical and/or material damage. Consult with your SANYO representative nearest you before using
any SANYO products described or contained herein in such applications.

SANYO assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other
parameters) listed in products specifications of any and all SANYO products described or contained
herein.

No. 6632-2/8

LA4628

Parameter Symbol Conditions Ratings Unit

Maximum supply voltage V

CC

max No signal 24 V

Maximum output current I

O

peak Per channel 4 A
Allowable power dissipation Pd max With an arbitrarily large heat sink 32.5 W
Operating temperature Topr –20 to +85 °C
Storage temperature Tstg –40 to +150 °C

Specifications

Maximum Ratings at Ta = 25°C

Parameter Symbol Conditions Ratings Unit

Recommended supply voltage V

CC

13.5 V
Recommended load resistance range RL op 4 to 8 Ω
Allowable operating supply voltage range V

CC

op 9 to 20 V

Operating Conditions at Ta = 25°C

Note: With VCC, RL, and the output level in ranges such that the Pdmax for the heat sink used is not exceeded.

Parameter Symbol Conditions

Ratings

Unit

min typ max

Quiescent current I

CCO

With Rg = 0 and RL open. 70 130 250 mA

Standby mode current drain I

st

Standby mode (amplifier off), with no power supply capacitor.

10 60 µA

Voltage gain V

G

VO= 0 dBm 38 40 42 dB

Total harmonic distortion THD P

O

= 1 W, Filter = FLAT 0.06 0.2 %

Output power

P

O

1 VCC= 13.5 V, THD = 10%, RL = 4 Ω 16 20 W

P

O

2 VCC= 16.5 V, THD = 10%, RL = 4 Ω 30 W

Output offset voltage V

N

offset Rg = 0 –300 +300 mV
Output noise voltage VNO Rg = 0, BPF = 20 Hz to 20 kHz 0.1 0.5 mV
Ripple rejection ratio SVRR Rg = 0, VR = 0 dBm, fR = 100 Hz 40 50 dB
Channel separation CH Sep Rg = 10 kΩ, V

O

= 0 dBm 50 60 dB
Input resistance Ri 21 30 39 kΩ
Standby pin applied voltage V

ST

Amplifier on (applied through an external 10 kΩ resistor) 2.5 V

CC

V

Operating Characteristics at Ta = 25°C, VCC= 13.5 V, RL = 4 Ω, f = 1 kHz, Rg = 600 Ω

Pd max — Ta

Ambient temperature, Ta —°C

10

15

0
–20 0 20 40 1601401201008060

5

20

25

30

35

Allowable power dissipation, Pd max — W

θjc=2.0°C/W

θf=3°C/W

θf=4°C/W

θf=7°C/W
θf=10°C/W

No Fin

Equivalent Circuit Block Diagram

No. 6632-3/8

LA4628

C8 0.1 µ
R4

2.2

C9 0.1 µ

R5

2.2

RL
4 Ω

–OUT2

+OUT2

–

+

Standby
SW

OFF

RIPPLE
FILTER

+

BIAS
CIRCUIT

STANDBY
SW

POP NOISE
PREVENTION
CIRCUIT

PREDRIVER

PREDRIVER

POWER

POWER

LOAD SHORT
PROTECTOR

OUTPUT PIN TO V

CC

SHORT PROTECTOR

OUTPUT PIN TO V

CC

SHORT PROTECTOR

OUTPUT PIN TO GND
SHORT PROTECTOR

OUTPUT PIN TO GND
SHORT PROTECTOR

PREDRIVER

PREDRIVER

POWER

POWER

OVER VOLTAGE/
SURGE

THERMAL
SHUT DOWN

LOAD SHORT
PROTECTOR

V

CC

+

+

ON

R1
10 K

+5 V

C4

2.2 µ
10 V

33 µ
10 V

0.47 µ
10 V

2.2 µ
10 V

C1

100 µ/16 V

V

CC

C5

2200 µ
25 V

+

**

**

C6 0.1 µ
R2

2.2

C7 0.1 µ

R3

2.2

RL
4 Ω

–OUT1

+OUT1

–

+

**

**

POWER
GND2

+ +

C3

C10

**
(POLYESTER
FILM
CAPACITOR)

+
–

IN

+
–

IN

C2

PRE GND

IN2

C3 C10
Sets the amplifier starting time
(Approximately 0.6 seconds when 33 µF)

Impulse noise reduction
(Note: The device’s ability to withstand shorting
to V

CC

or shorting to ground when VCC is around
16 V may be reduced as the value of this
capacitor is increased. We recommend 0.47 µF.)

POWER
GND1

14

2

1

3

4

6

7

5

8

10

9

11

12

13