Datasheet LA4277 Datasheet (SANYO)

Ordering number: ENN7095

SANYO Electric Co.,Ltd. Semiconductor Company

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

Monolithic Linear IC

LA4277

5 W 2-Channel Power Amplifier

Overview

The LA4277 is a 5 W 2-channel power amplifier intended
for televisions.
This IC has a series of pin compatible monaural and 2­channel power amplifiers, thus allows the end product to
use a common circuit boad.

Features

• Television audio output.

• Pin compatible with the LA4266 (3 W)/LA4267 (5 W)/

4268 (10 W) and the LA4276 (3 W × 2)/4278(10 W × 2).

• Package: SIP-10HD (2.54 mm pitch, straight pins).

• Thermal protection circuit and overvoltage protection
circuit on chip.

• Output power: 5 W × 2(VCC = 20 V/RL = 8 Ω).

Specifications

Maximum Ratings at Ta = 25°C

Package Dimensions

unit: mm

3248-SIP10HD

[LA4277]

15.4max

(11.8)

4.5

2.4

0.4

1.2

25.6

C0.7

110

1.37

2.54

3.4

0.5

(10.0)

1.15

2.0

13.9

11.2

1.0 min

SANYO: SIP10HD

Parameter Symbol Conditions Ratings Unit

Maximum supply voltage V

Allowable power dissipation Pd max Infinite heat sink 15.0 W

Thermal resistance

Operating temperature Topr –20 to +75 °C

Storage temperature Tstg –40 to +150 °C

CC

θ

j-c 3.0 °C/W

Rg = 0 25 V

Operating Conditions at Ta = 25°C

Parameter Symbol Conditions Ratings Unit

Recommended supply voltage V

Load resistance R

Operating supply voltage range VCC op Range does not exceed Pd 10 to 24 V

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.

CC

L

20 V

8 Ω

41202RM (II) No. 7095-1/6

LA4277

Operating Characteristics at Ta = 25°C, VCC = 20 V, RL = 8 Ω, f = 1 kHz, RNF = 150 Ω, Rg = 600 Ω, with specified

board, in specified circuit

Parameter Symbol Conditions

Quiescent current I

CCO

Rg = 0 50 70 mA

Voltage gain VG VO = 0 dBm 38 40 42 dB

Total harmonic distortion THD PO = 0.5 W 0.1 0.8 %

Output noise voltage V

Output power P

NO

O

Rg = 10 kΩ, BPF = 20 Hz to 20 kHz 0.25 1.0 mV

THD = 10 % 4.0 5.0 W

Ripple rejection SVRR Rg = 0, fr = 100 Hz, Vr = 0.5 Vrms 35 45 dB

Crosstalk CT Rg = 10 kΩ, VO = 0 dBm 40 45 dB

Ratings

min typ max

Unit

Pd max – Ta

200 40 60 80 100 120 140

Allowable power dissipation, Pd max – W

16

15

14

12

10

Infinite heat sink

100 × 100 × 1.5 mm

11.7

8

50 × 50 × 1.5 mm

5.8

6

4

No heat sink

2

2

0

--20

Ambient temperature, Ta – °C

Pin Assignment and Equivalent Circuit Diagram

20 kΩ56 Ω

15

3

7.02

3

3.48

1.2

AI heat sink
Mounting
torque 39N•cm
Flat washer
Silicone grease
applied

ILA00835

160

20 kΩ

NF1

1 2 3 4

R1

150 Ω

+

C1

100 µF

IN1

C2

Filter

PRE GND

IN2

NF2

56 Ω

OUT2

Power GND

V

CC

OUT1

5 6 7 8910

R5

150 Ω

R4

R2

100 kΩ

+

C3

100 µF

R3

200 Ω

4.7 µF

100 kΩ

+

+

C4

C5

4.7 µF

+

C6

100 µF

1000 µF

R

L

C7

R6

0.1 µF

1.0 Ω

+

C8

+

1000 µF

C9

R

L

C10

R7

0.1 µF

1.0 Ω

1000 µF

* For Muting, add a resistor between pin 3 and GND. 750 Ω for the LA4266/67/68, 200 Ω for the LA4276/77.

No. 7095-2/6

LA4277

Description of External Parts

C1, C5: Feedback capacitors

Decreasing the capacitance value lowers the low frequency response. Increasing the capacitance value makes the

starting time later.
C2, C4: Input capacitors
C3: Ripple filter capacitor

Decreasing the capacitance value too far or eliminating it altogether causes ripple to occur. However, ripple is not

necessarily reduced if the capacitance value is increased. This capacitor also affects the starting time; decreasing the

capacitance value makes the starting time earlier.
C6, C9: Output capacitors

Decreasing the capacitance value causes insufficient power at low frequencies.
C7, C10: Oscillation blocking capacitors

Decreasing the capacitance value causes oscillation to occur easily. Use a mylar film capacitor that has good high

frequency response and temperature characteristics. The use of an electrolytic capacitor or a ceramic capacitor may

cause oscillation to occur at low temperatures.
C8: Power capacitor

Decreasing the capacitance value causes ripple to occur easily. Locating this capacitor at a distance from the IC or

removing this capacitor may cause oscillation to occur.
R1, R5: Feedback resistors

Refer to supplementary discussion “Voltage Gain.”
R2, R4: Input bias resistors

These determine the bias (GND potential bias) and the input impedance of the input pins. If a variable resistor or

other device also serves this function, these resistors can be omitted.
R3: Muting resistor

Refer to supplementary discussion “External Muting.”
R6, R7: Resistors connected in series with oscillation blocking capacitor

These prevent phase shift in conjunction with the oscillation blocking capacitor so that oscillation does not easily

occur. There is an optimal value for the resistor; increasing or decreasing the resistance causes oscillation to occur

easily.

External Muting

• Pull down the electric potential of the ripple filter pin (pin 3).

Muting becomes possible by inserting the discharge resistor R3 between pin 3
and GND. If the resistance value of R3 is too low, a popping noise is generated; if
the resistance value is too high, the muting effect is reduced. (A value of 200 Ω is
recommended for R3.)

Voltage Gain

The voltage gain can be lowered by adding external resistors R1/R5 in
series to feedback capacitors C1/C5. When R1/R5 = 150 Ω, the voltage
gain is 40 dB. However, it is important to note that because there is no
phase compensation pin, decreasing the voltage gain can extend the high
frequency characteristics, allowing oscillation to occur easily.

RNF

IN1/2

5 6 7

R1/R5

C1/C5 C6/C9 C7/C10

+

C2/C4

Filter

IN1

2 3 4

C3

Rf 30 kΩ

300 Ω

NF1/2 OUT1/2

(1)(2) (10)

+

R

L

PRE GND

+

R3

Mute SW

+

R2/R3

No. 7095-3/6

LA4277

Notes on Using the IC

• Maximum ratings

When this IC is used near its maximum ratings, it is possible that a slight fluctuation in the operating conditions could
cause the maximum ratings to be exceeded, damaging the IC. Therefore, allow for an adequate safety margin in
regards to supply voltage, etc., so that the IC is never used under conditions that exceed its maximum ratings.

• Short circuit between pins

Applying power to the IC while a short circuit exists between two pins can cause damage or deterioration in the IC.
Therefore, after mounting the IC on a board, make sure that there are no solder bridges, etc., causing a short circuit
between any of the pins before applying power to the IC.

• Using the IC in a radio

When using this IC in a radio, make sure that there is enough distance between the IC and the bar antenna.

• Printed circuit pattern

When designing the printed circuit pattern, keep power, output, and ground lines thick and short, and determine the
placement of the pattern and the components in such a way as to prevent the generation of an I/O feedback loop.
In addition, power supply capacitor C8 and oscillation blocking capacitor C7 and C10 should be placed as close as
possible to the IC pins in order to prevent oscillation.

I

50

45

40

— mA

35

CCO

30

25

20

15

10

Quiescent current, I

5

Total harmonic distortion, THD -- %

1.0

0.1

0

2

10

7

5

3

2

7

5

3

2

7

5

3

5

0

V

CC

RL = 8 Ω

0.1 1.0

10 20 2515 30 35

Supply voltage, V

= 20 V

23 57

Output power, PO — W

CCO

THD – P

f = 10 kHz

f = 100 Hz

f = 1 kHz

– V

CC

CC

O

23 57

— V

Rg = 0

ILA00869

ILA00871

10

RL = 8 Ω
f = 1 kHz

8

— W

O

6

4

Output power, P

2

0

6

8162012 2414 1810 22 26

2

1.0

7

5

3

2

0.1

7

5

Total harmonic distortion, THD — %

3

23 57 23 57 23 5 23 57

10

10 100

P

V

–

O

CC

Supply voltage, V

THD – f

CH1

CH2

Frequency, f — Hz

1 k 10 k

CC

— V

ILA00870

V

CC

RL = 8 Ω
PO = 0.5 W

ILA00872

= 20 V

No. 7095-4/6

LA4277

1

V
RL = 8 Ω
VO = 0

0

--1

--2

--3

Response — dB

--4

--5
10 100

0.4

0.3

0.2

0.1

= 20 V

CC

23 57 2357 23 57 23 57

Response – f

Frequency, f — Hz

VNO – Rg

Output noise voltage, VNO — mVrms

0

1 k 10 k

7

6

5

4

3

2

23 5 23 57

Input signal source resistance, Rg — Ω

V

= 20 V

CC

RL = 8 Ω
f = 1 kHz
Pd = V

CC × ICC

— 2 × P

Power dissipation, Pd — W

1

0

20

23 57

0.1 1.0

Output power, PO — W

ATT – 3PINDC(2)

1 k

Pd – P

O

10 k 100 k

V

CC

RL = 8 Ω
DIN Audio

O

23 57

ILA00873

= 20 V

ILA00875

ILA00877

80

70

60

CT – f

CH2→CH1

V

= 20 V

CC

RL = 8 Ω
Rg = 10 kΩ
VO = 0

CH1→CH2

50

40

Crosstalk, CT — dB

30

20

23 57 23 57 2 3 57 2 3 57

10 100

3

V

2

RL = 8 Ω
Rg = 0

10

fr = 100 Hz

7

5

3

2

1.0

7

5

3

2

Output ripple voltage, Vro — mVrms

0.1

20

0

CC

= 20 V

Ripple voltage, Vr — V

ATT – 3PINDC(1)

1 k 10 k 100 k

Frequency, f — Hz

ILA00874

Vro – Vr

0.1 1.0

23 57357

ILA00876

Filter

--20

--40

--60

Muting attenuation, ATT — dB

--80

10

--100
24681012 151710 3579111314161819

3

100 F

External
power
supply

+

BPF = 20 Hz to 20 kHz

Pin 3 voltage can be adjusted

by the external power supply

Pin 3 voltage, V3 — V

V

= 20 V

CC

RL = 8 Ω

VO = 1 Vrms

f = 1 kHz

ILA00878

Muting attenuation, ATT — dB

--20

--40

--60

--80

--100

0

Filter

3

100 F

External
power
supply

+

V

VO = 2 Vrms

BPF = 20 Hz to 20 kHz

Pin 3 voltage can be adjusted

by the external power supply

24681012 151710 3579111314161819

Pin 3 voltage, V3 — V

= 20 V

CC

RL = 8 Ω

f = 1 kHz

ILA00879

No. 7095-5/6

LA4277

0.5 s/DIV

0

Pop noise waveform (1 V/DIV)

SP terminal AC

0

Pop noise waveform (1 V/DIV)

0.5 s/DIV

Output DC

Middle point rise waveform (5 V/DIV)

0

Power on output waveform

ILA00959

Middle point fall waveform (5 V/DIV)

0

Power off output waveform

ILA00960

Specifications of any and all SANYO products described or contained herein stipulate the performance,
characteristics, and functions of the described products in the independent state, and are not guarantees
of the performance, characteristics, and functions of the described products as mounted in the customer’s
products or equipment. To verify symptoms and states that cannot be evaluated in an independent device,
the customer should always evaluate and test devices mounted in the customer’s products or equipment.

SANYO Electric Co., Ltd. strives to supply high-quality high-reliability products. However, any and all
semiconductor products fail with some probability. It is possible that these probabilistic failures could
give rise to accidents or events that could endanger human lives, that could give rise to smoke or fire,
or that could cause damage to other property. When designing equipment, adopt safety measures so
that these kinds of accidents or events cannot occur. Such measures include but are not limited to protective
circuits and error prevention circuits for safe design, redundant design, and structural design.

In the event that any or all SANYO products (including technical data, services) described or contained
herein are controlled under any of applicable local export control laws and regulations, such products must
not be exported without obtaining the export license from the authorities concerned in accordance with the
above law.

No part of this publication may be reproduced or transmitted in any form or by any means, electronic or
mechanical, including photocopying and recording, or any information storage or retrieval system,
or otherwise, without the prior written permission of SANYO Electric Co., Ltd.

Any and all information described or contained herein are subject to change without notice due to
product/technology improvement, etc. When designing equipment, refer to the “Delivery Specification”
for the SANYO product that you intend to use.

Information (including circuit diagrams and circuit parameters) herein is for example only; it is not
guaranteed for volume production. SANYO believes information herein is accurate and reliable, but
no guarantees are made or implied regarding its use or any infringements of intellectual property rights
or other rights of third parties.

This catalog provides information as of April, 2002. Specifications and information herein are subject to
change without notice.

PS No. 7095-6/6