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 3113-SIP14HZ
9 V operation facilitates set design with a small footprint.
[LA4598]
Functions
. Thermal shutdown protector built in.
. Standby switch built in.
Features
. No heat sink needed during 9 V operation
. P = 2.9 W × 2 (V = 9 V, R = 3.2 Ω, THD = 10%).
. Less quiescent current. (V = 9 V, 20 mA, typ).
O CC L
. Operating voltage range: V op = 4.2 to 16 V.
CC
CC
SANYO : SIP14HZ
Allowable power dissipation, Pd max − W
Al heat sink tightening
With arbitrarily large heat torque 4kg.cm
sink
With silicone grease
applied
With Sanyo-
recommended board
Independent IC
Specifications Ambient temperature, Ta − °C
Maximum Ratings at Ta = 25 °C
Parameter Symbol Conditions Ratings Unit
Maximum supply voltage VCC max 18 V
Allowable power dissipation Pd max* No heat sink 3.6 W
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
LA4598
Operating Conditions at Ta = 25 °C
Parameter Symbol Conditions Ratings Unit
Recommended supply voltage VCC 9 V
Recommended load resistance RL 3.2 Ω
Operating voltage range VCC op 4.2 to 16.0 V
Operating Characteristics at Ta = 25 °C, VCC = 9 V, f = 1 kHz, Rg = 600 Ω, RL = 3.2 Ω
Parameter Symbol Conditions min typ max unit
Quiescent current ICCO 10 20 40 mA
Voltage gain VG 47 49 51 dB
PO1 THD = 10% 2.2 2.9 W
Output power
PO2 THD = 10%, RL = 4 Ω 2.3 W
Total harmonic distortion THD VO = 2 V 0.3 1.0 %
Input resistance ri 20 30 kΩ
VNO1 Rg = 0, B.P.F = 20 Hz to 20 kHz 0.4 1.0 mV
Output noise voltage
VNO2 Rg = 10 kΩ, B.P.F = 20 Hz to 20 kHz 0.6 2.0 mV
Ripple rejection ratio Rr Rg = 0, fr = 100 Hz, VCCr = 150 mV 40 50 dB
Channel separation CH Sep Rg = 10 kΩ, VO = 0 dB 45 55 dB
Standby current Isd 10 µA
Block Diagram
ch1 BS
ch1 Input
Input Predrive Power
amplifier amplifier amplifier ch1 output
ch1 NF
Power GND
Pre GND
Thermal shutdown
protector
VCC
D.C Bias circuit
Standby switch Standby
ch2 Input Power
Input Predrive
amplifier amplifier amplifier ch2 output
ch2 NF
ch2 BS
Sample Print Pattern
Unit (resistance: Ω, capacitance: F)
Copper-foiled side 85 × 90 mm2
No.4087-2/9
LA4598
Sample Application Circuit
To large signal GND
Mylar capacitor
Unit (resistance:Ω, 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
C1, C8: 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.
C2, C6: Output capacitors
If the capacitor value is reduced, low-region roll-off frequency fL and low-region Po worsen.
C3, C7: Oscillation blocking capacitors
Mylar capacitor, which is excellent in temperature characteristics and frequency characteristics is used.
C4: 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.
C5: Standby capacitor
Pop noise reduction capacitor
C9, C11: Feedback capacitors
In addition to affecting low-region roll-off frequency fL, if the capacitor value is increased, the start-up time is extended.
C10: Decoupling capacitor
This capacitor absorbs power supply ripples; 220 µF is recommended.
R1, R2: Oscillation blocking resistors
The resistor value may be varied 3.3 Ω to 1.0 Ω.
No.4087-3/9
Quiescent current, ICCO − mA
Current drain, ICC − A Total harmonic distortion, THD − %
mA
Frequency, f − Hz
Supply voltage, VCC − V
Output power, PO − W
Power dissipation, Pd − W
Output power, PO − W Current drain, ICC − A
LA4598
Current drain, ICC − A
Pd when VCC=12 V
Pd when 9 V
Output power, PO − W
Supply voltage, VCC − V
Output power, PO − W
No.4087-4/9
Power dissipation, Pd − W Power dissipation, Pd − W
LA4598
Total harmonic distortion, THD − %
CH2 to CH1
Channel separation − dB
leak
CH1 to CH2
leak
Frequency, f − Hz Supply voltage, VCC − V
Total harmonic distortion, THD − %
Response − dB
Frequency, f − Hz Output power, PO − W
Output ripple noise voltage, VNOR − mV
DIN Audio with
20 Hz to 20 kHz BPF
Output noise voltage, VNO − mV
Supply voltage, VCC − V Supply voltage, VCC − V
No.4087-5/9
LA4598
Output ripple noise voltage, VNOR − mV
Output ripple noise voltage, VNOR − mV
Ω
Ripple frequency, fR − Hz Power supply ripple, VR − mV
BTL Sample Application Circuit
To large signal GND
Unit (resistance:Ω, 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.
No.4087-6/9
Output power, PO − W Current drain, ICC − A
Response − dB
Output power, PO − W
Frequency, f − Hz
Supply voltage, VCC − V
Power dissipation, Pd − W
Total harmonic distortion, THD − % Current drain, ICC − A
LA4598
Output power, PO − W
Output power, PO − W
Power dissipation, Pd − W
No.4087-7/9
LA4598
Features and Usage Notes
1. VG can be lowered by adding an RNF’ to the NF pins (pins 5 and 11).
Calculated as follows:
VG = 20log Rf/(RNF + RNF’)
The IC contains Rf = 20 kΩ, RNF = 62 Ω.
However, the following must be noted:
a) If RNF’ is added, the ripple bypass effect due to the NF capacitor will worsen, resulting in a worsening of ripple
rejection.
b) Oscillation stability requires, use at 40 dB or less to be avoided.
2. Pin 9 is intended for standby. It is used in conjunction with power supply pin 4. However, it should be noted that when
power supply pin 9 and pin 4 are used for separate systems, the output power is affected by the pin 9 supply voltage.
3. It is recommendable to use no input capacitor. However when rubbing noise generated by the volume control is offencive to
the ear, an input capacitor must be inserted.
4. Extreme caution must be exercised when the IC is used in the vincity of the maximum ratings, since even a slight variation
in conditions may cause the maximum ratings to be exceeded, thereby leading to breakdown.
5. When making the board, refer to the sample printed circuit pattern. No feedback loop must be formed between input and
output. Thick and short wiring is required so that no common resistance exists between the preamplifier GND and power
amplifier GND.
6. Addition of components as shown below enables use without introducing an increased distortion at VCC of up to
approximately 4.5 V. A capacitor of 470 µF is inserted against pop noise.
Proper Cares in Mounting a Radiator Fin
1. The tightening torque should be in a range from 4 to 6 kg.cm.
2. The spacing between the screw holes of the radiator fin must match the spacing between the screw holes of the IC. With case
outline dimensions L and R referred to, the screws must be tightened with the distance between them as close to each other
as possible.
3. The screws to be used must have a head equivalent to the one of truss machine screw or binder machine screw defined by
JIS. Washers must also be used to protect the IC case.
4. No foreign matter such as cutting particles should exist between heat sink and radiator fin. When applying grease on the
junction surface, it must be applied uniformly on the whole surface.
5. IC lead pins should be soldered to the printed circuit board after the radiator fin is mounted on the IC.
No.4087-8/9
LA4598
No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment,
nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of which may directly or
indirectly cause injury, death or property loss.
Anyone purchasing any products described or contained herein for an above-mentioned use shall:
1 Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors
and all their officers and employees, jointly and severally, against any and all claims and litigation and all damages, cost and
expenses associated with such use:
2 Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on SANYO
ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees jointly or severally.
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 December, 1995. Specifications and information herein are subject to change without notice.
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