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Ordering number: EN4087C
Monolithic Linear IC
LA4598
Two-channel Power Amplifier for Radio Cassette Players (No Heat Sink Needed during 9 V Operation)
Overview
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.
Package Dimensions
unit : mm
3113-SIP14HZ
[LA4598]
Functions
. Thermal shutdown protector built in. . Standby switch built in.
Features
. No heat sink needed during 9 V operation . P = 2.9 W x 2 (V = 9 V, R = 3.2 , THD = 10%). . Less quiescent current. (V = 9 V, 20 mA, typ). . Operating voltage range: V op = 4.2 to 16 V.
O CC L CC CC
SANYO : SIP14HZ
Allowable power dissipation, Pd max - W
With arbitrarily large heat sink
Al heat sink tightening torque 4kg.cm With silicone grease applied
With Sanyorecommended board
Independent IC
Specifications
Maximum Ratings at Ta = 25 C
Parameter Maximum supply voltage Allowable power dissipation Junction temperature Operating temperature Storage temperature Symbol VCC max Pd max* Tj max Topr Tstg No heat sink Conditions
Ambient temperature, Ta - C
Ratings 18 3.6 +150 -20 to +75 -40 to +150
Unit V W C C C
* With Sanyo-recommended board (9.0 cm x 8.5 cm x 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 Recommended supply voltage Recommended load resistance Operating voltage range Symbol VCC RL VCC op Conditions Ratings 9 3.2 4.2 to 16.0 Unit V V
Operating Characteristics at Ta = 25 C, VCC = 9 V, f = 1 kHz, Rg = 600 , RL = 3.2
Parameter Quiescent current Voltage gain Output power Total harmonic distortion Input resistance Output noise voltage Ripple rejection ratio Channel separation Standby current Symbol ICCO VG PO1 PO2 THD ri VNO1 VNO2 Rr CH Sep Isd Conditions min 10 47 2.2 typ 20 49 2.9 2.3 0.3 30 0.4 0.6 50 55 max 40 51 unit mA dB W W % k mV mV dB dB A
THD = 10% THD = 10%, RL = 4 VO = 2 V Rg Rg Rg Rg = = = = 0, B.P.F = 20 Hz to 20 kHz 10 k, B.P.F = 20 Hz to 20 kHz 0, fr = 100 Hz, VCCr = 150 mV 10 k, VO = 0 dB
1.0 1.0 2.0
20
40 45
10
Block Diagram
ch1 BS ch1 Input ch1 NF Pre GND
Thermal shutdown protector
Input amplifier
Predrive amplifier
Power amplifier
ch1 output Power GND VCC Standby
D.C
Bias circuit
Standby switch
ch2 Input ch2 NF
Input amplifier
Predrive amplifier
Power amplifier
ch2 output ch2 BS
Sample Print Pattern
Copper-foiled side 85 x 90 mm2
Unit (resistance: , capacitance: F) No.4087-2/9
LA4598
Sample Application Circuit
To large signal GND
Mylar capacitor Unit (resistance:, 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 F 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 F to 2200 F is recommended. Standby capacitor Pop noise reduction capacitor
C5:
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 F is recommended.
R1, R2: Oscillation blocking resistors The resistor value may be varied 3.3 to 1.0 .
No.4087-3/9
Quiescent current, ICCO - mA mA Current drain, ICC - A Total harmonic distortion, THD - %
Frequency, f - Hz
Supply voltage, VCC - V Output power, PO - W Power dissipation, Pd - W Current drain, ICC - A
Pd when VCC=12 V Pd when 9 V
LA4598
Output power, PO - W
Current drain, ICC - A
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
Channel separation - dB
CH2 to CH1 leak
CH1 to CH2 leak
Frequency, f - Hz
Total harmonic distortion, THD - %
Supply voltage, VCC - V
Frequency, f - Hz
Total harmonic distortion, THD - %
Response - dB
Output power, PO - W
Output ripple noise voltage, VNOR - mV
Supply voltage, VCC - V
Output noise voltage, VNO - mV
DIN Audio with 20 Hz to 20 kHz BPF
Supply voltage, VCC - V
No.4087-5/9
LA4598
Output ripple noise voltage, VNOR - mV
Output ripple noise voltage, VNOR - mV
Ripple frequency, fR - Hz
Power supply ripple, VR - mV
BTL Sample Application Circuit
To large signal GND
Unit (resistance:, 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
Response - dB
Output power, PO - W
Current drain, ICC - A
Output power, PO - W
Supply voltage, VCC - V
Frequency, f - Hz Total harmonic distortion, THD - % Output power, PO - W Output power, PO - W
Power dissipation, Pd - W Current drain, ICC - A
LA4598
No.4087-7/9
Power dissipation, Pd - W
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 k, RNF = 62 . 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. 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. 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. 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. 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. 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 F is inserted against pop noise.
2. 3. 4. 5.
6.
Proper Cares in Mounting a Radiator Fin
1. 2. The tightening torque should be in a range from 4 to 6 kg.cm. 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. 4. 5.
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. 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. 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.
No.4087-9/9

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