LA4485.PDF

Ordering number: EN3680C

Monolithic Linear IC

LA4485

5 W, Two-channel Power Amplifier with Very Few

External Parts

Overview

Package Dimensions

unit : mm

The LA4485 is a 5 W, two-channel power amplifier IC that

requires a minimum of external parts, making it ideal for radio

cassette players and car stereo equipment.

3107-SIP13H

The LA4485 eliminates the need for bootstrap capacitors,

negative feedback capacitors, and oscillation prevention CR

parts, all of which were necessities for power ICs previously.

All of these functions are now on chip, keeping the number of

external parts to an absolute minimum. The LA4485 is part of

the Power (Stylish Power) Series, and supports two modes:

dual and BTL.

[LA4485]

. 5W´2 output power in dual mode, and 15 W in BTL mode

. Minimum external parts for the Power Series count:

4 or 5 parts in dual mode; 3 or 4 parts in BTL mode

. Protection circuits

Overvoltage protection

Thermal protection

DC output short-circuit protection (to V CC and to GND)

SANYO : SIP13H

. Circuitry designed to handle +V CC applied to the outputs

. Standby switch

. Muting function

Specifications

Maximum Ratings at Ta = 25°C

Parameter

Symbol

Conditions

Ratings

Unit

Maximum supply voltage

V CC max

No signal

Surge supply voltage

V CC surge * Based on the JASO standard

Peak output current

I O peak

Per channel

3.3

Allowable power dissipation

Pd max

With infinite heat sink

Operating temperature

Topr

–30 to +80

°C

Storage temperature

Tstg

–40 to +150

°C

*: By the p type B check point method.

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.

SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters

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

73096HA(II)/D2893TS/9041TS No.3680-1/21

Features

. Pop noise reduction

LA4485

Operating Conditions at Ta = 25°C

Parameter

Symbol

Conditions

Ratings

Unit

Recommended supply voltage

V CC

13.2

Supply voltage range

V CC op

Must not be over package Pd

7.5 to 18

Recommended load resistance range

R L

Dual

2 to 8

BTL

4to8

Operating Characteristics at Ta = 25°C, V CC = 13.2 V, R L =4

,Rg=600

,f=1kHz, Dual

Parameter

Symbol

Conditions

min typ max Unit

Standby current

Ist Pin 9 to GND, Standby switch OFF

10 µA

Quiescent supply current

I CCO Rg = 0

40 80 160 mA

Voltage gain

VG1 Dual: V O = 0 dBm

43 45 47 dB

VG2 BTL: V O = 0 dBm

Output power

P O 1 * Dual: THD = 10%

4 5

P O 2 BTL: THD = 10%

11 15

Total harmonic distortion

THD P O = 1 W

0.15 0.8 %

Channel separation

CH sep V O = 0 dBm, Rg = 0

45 55

Output noise voltage

V NO Rg = 0, 20 Hz to 20 kHz bandpass filter

0.15 0.5 mV

Rg = 0, 20 Hz to 20 kHz bandpass filter,

f R = 100 Hz, V R = 0 dBm, decoupling capacitor

connected

Ripple rejection ratio

SVRR

40 50

*: P O 1 = 6 W (typ) when V CC = 14.4 V

Voff ± 250 mV for BTL-mode

Pd max – Ta

Infinite heat sink

Al heat sink

mounting

conditions

Mounting

torque

39 N v cm.

Flat washer

with silicone

grease

applied

No heat sink

Ambient temperature, Ta – °C

No.3680-2/21

LA4485

Equivalent Circuit Block Diagram

FILTER

Large signal

V CC

Small signal

V CC

Filter

CH1 IN

Pre

drive

amp

Output-to-ground

short-circuit

protection

Input

amp

CH1

Output

amp

CH1 OUT

Output-to-supply

short-circuit

protection

Thermal shutdown

protection

Small signal GND

REF

amp

Large signal GND

Overvoltage

protection

BTL IN

Output-to-supply

short-circuit

protection

Pre

drive

amp

Input

amp

CH2

Output

amp

CH2 OUT

CH2 IN

Output-to-ground

short-circuit

protection

Standby switch Mute

BTL OUT STANDBY MUTE

Recommended LA4485 External Parts Arrangement (Dual-mode)

95.0

67.0 mm 2

No.3680-3/21

LA4485

IC Usage Notes

Maximum ratings

Care must be taken when operating the LA4485 close to the maximum ratings as small changes in the operating conditions can

cause the maximum ratings to be exceeded, thereby breakdown will be caused.

Printed circuit board connections

Care must be taken when designing the circuit of printed board so as not to form feedback loops, particularly with the small-signal

and large-signal ground connections.

Notes on LA4485 heatsink mounting

1. Mounting torque must be in the range 39 to 59 Nvcm.

2. The spacing of the tapped holes in the heatsink must match the spacing of the holes in the IC tab.

3. Use screws with heads equivalent to truss head machine screws and binding head machine screws stipulated by JIS for the

mounting screws. Furthermore, washers must be used to protect the surface of the IC tab.

4. Make sure that there is no foreign matter, such as cutting debris, between the IC tab and the heatsink. If a heat conducting

compound is applied between the contact surfaces, make sure that it is spread uniformly over the entire surface.

5. Because the heatsink mounting tab and the heatsink are at the same electric potential as the chip’s GND (large signal GND),

care must be taken when mounting the heatsink on more than one device.

6. The heatsink must be mounted before soldering the pins to the PCB.

Comparison of External Parts Required

External parts

Existing device LA4485

Output coupling capacitors

Yes

Input coupling capacitors

Yes

Bootstrap capacitors

Yes

Feedback capacitors

Yes

Filter capacitor

Yes

Optional

Phase compensating capacitor

Yes

Oscillation-quenching mylar capacitors

Yes

Oscillation-quenching resistors

Yes

Others

Optional

Total (for dual-mode)

15 to 16 parts 4 to 6 parts

Note: Supply capacitors, contained within the power IC, are not counted in both existing and new devices.

No.3680-4/21

LA4485

Operating Pin Voltages at V CC = 13.2 V

Pin No. Name Function Pin voltage (Reference value)

1 CH1 IN Channel 1 input. 1.4 V (2 V BE )

2 CH2 IN Channel 2 input. 1.4 V (2 V BE )

3 SS GND Small-signal ground 0 V

4 BTL IN BTL-mode feedback input. 45 mV

5 BTL OUT BTL-mode feedback output. 3.1 V ( 6 1/4 V CC )

6 FILTER Filter capacitor connection. 6.6 V ( 6 1/2 V CC )

7 L CC Large-signal supply

13.2 V (V CC )

8 CC Small-signal supply

13.2 V (V CC )

9 STANDBY Standby control input.

5 V

10 MUTE Mute control input.

0 V

11 CH2 OUT Channel 2 output.

6.3 V

12 LS GND Large-signal ground

0 V

13 CH1 OUT Channel 1 output.

6.3 V

Note: Each pin is so arranged lest the IC should be broken even if inserted reversely.

LA4485 Sample Application Circuit

No.3680-5/21

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