LA4598.PDF

Ordering number: EN4087C

Monolithic Linear IC

LA4598

Two-channel Power Amplifier for Radio Cassette

Players (No Heat Sink Needed during 9 V Operation)

Overview

Package Dimensions

unit : mm

The LA4598 is a two-channel power IC that is intended for

use in portable audio equipment. Needing no heat sink during

9 V operation facilitates set design with a small footprint.

3113-SIP14HZ

[LA4598]

Functions

. Thermal shutdown protector built in.

Features

. No heat sink needed during 9 V operation

. Less quiescent current. (V CC = 9 V, 20 mA, typ).

SANYO : SIP14HZ

With arbitrarily large heat

sink

Al heat sink tightening

torque 4kg . cm

With silicone grease

applied

With Sanyo-

recommended board

Independent IC

Specifications

Ambient temperature, Ta − ° C

Maximum Ratings atTa=25 ° C

Parameter

Symbol

Conditions

Ratings

Unit

Maximum supply voltage

V CC max

Allowable power dissipation

Pd max* No heat sink

3.6

Junction temperature

Tj max

+150

° C

Operating temperature

Topr

–20 to +75

° C

Storage temperature

Tstg

–40 to +150

° C

* With Sanyo-recommended board (9.0 cm ´ 8.5 cm ´ 1.5 mm (thickness))

SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters

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

D3095HA/N1792TS(II) No.4087-1/9

. Standby switch built in.

. P O = 2.9 W ´ 2(V CC =9V,R L = 3.2 W, THD = 10%).

. Operating voltage range: V CC op = 4.2 to 16 V.

LA4598

Operating Conditions atTa=25 ° C

Parameter

Symbol

Conditions

Ratings

Unit

Recommended supply voltage

V CC

Recommended load resistance

R L

3.2

Operating voltage range

V CC op

4.2 to 16.0

Operating Characteristics atTa=25 ° C, V CC =9V,f=1kHz, Rg = 600

,R L = 3.2

Parameter

Symbol

Conditions

min typ max unit

Quiescent current

I CCO

10 20 40 mA

Voltage gain

47 49 51 dB

Output power

P O 1 THD = 10%

2.2 2.9

P O 2 THD = 10%, R L =4 W

2.3

Total harmonic distortion

THD V O = 2 V

0.3 1.0 %

Input resistance

20 30

Output noise voltage

V NO1 Rg = 0, B.P.F = 20 Hz to 20 kHz

0.4 1.0 mV

V NO2 Rg=10k W , B.P.F = 20 Hz to 20 kHz

0.6 2.0 mV

Ripple rejection ratio

Rr Rg = 0, fr = 100 Hz, V CC r = 150 mV

40 50

Channel separation

CH Sep Rg = 10 k W ,V O =0dB

45 55

Standby current

Isd

10 µA

Block Diagram

ch1 BS

ch1 Input

Input

amplifier

Predrive

amplifier

Power

amplifier

ch1 output

ch1 NF

Pre GND

Power GND

Thermal shutdown

protector

V CC

D.C

Bias circuit

Standby switch

Standby

ch2 Input

Input

amplifier

Power

amplifier

Predrive

amplifier

ch2 output

ch2 NF

ch2 BS

Sample Print Pattern

Unit (resistance: W , capacitance: F)

Copper-foiled side 85 ´ 90 mm 2

No.4087-2/9

LA4598

Sample Application Circuit

To large signal GND

Mylar capacitor

Unit (resistance: W , capacitance:F)

Mylar capacitor

C + R can be added to the negative side of the output capacitor.

However, this is true only for a Sanyo-recommended board; for a set board, artwork must also be

considered.

Description of External Components

C 1 ,C 8 : Bootstrap capacitors

These capacitors affect low-region output; if the capacitor value is reduced, the low-region output decreases. Therefore,

47 µF or more is desirable.

C 2 ,C 6 : Output capacitors

If the capacitor value is reduced, low-region roll-off frequency f L and low-region Po worsen.

C 3 ,C 7 : Oscillation blocking capacitors

Mylar capacitor, which is excellent in temperature characteristics and frequency characteristics is used.

C 4 : Power supply capacitor

The capacitor values depends on the power supply line loads (motor, and the like.) and transformer ripple component.

1000 µF to 2200 µF is recommended.

C 5 : Standby capacitor

Pop noise reduction capacitor

C 9 ,C 11 : Feedback capacitors

In addition to affecting low-region roll-off frequency f L , if the capacitor value is increased, the start-up time is extended.

C 10 : Decoupling capacitor

This capacitor absorbs power supply ripples; 220 µF is recommended.

R 1 ,R 2 : Oscillation blocking resistors

The resistor value may be varied 3.3 W to 1.0 W.

No.4087-3/9

Quiescent current, I CCO −mA

Current drain, I CC −A

Total harmonic distortion, THD − %

Power dissipation, Pd − W

Output power, P O −W

Current drain, I CC −A

Power dissipation, Pd − W

LA4598

CH2 to CH1

leak

CH1 to CH2

leak

Frequency,f−Hz

Supply voltage, V CC −V

Frequency,f−Hz

Output power, P O −W

DIN Audio with

20 Hz to 20 kHz BPF

Supply voltage, V CC −V

No.4087-5/9

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