Sanyo LA4510 Specifications

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.

Monolithic Linear IC

240mW AF Power Amplifier

Ordering number:ENN1161D

LA4510

SANYO Electric Co.,Ltd. Semiconductor Company

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

Applications

• Especially suited for use in 3V micro cassette recorder, mini cassette recorder, headphone stereo applications.

Features

• Operating supply voltage range : 2 to 5V.

• Low current dissipation (7mA typ/VCC=3V).

• Output power :

240mW typ at VCC=3V, RL=4Ω, THD=10% 40mW typ at VCC=3V, RL=32Ω, THD=10%

• Built-in muting circuit to be operated at the time of power switch ON capable of varying starting time and making pop noise low.

• Soft clipping.

Specifications

Absolute Maximum Ratings at Ta = 25˚C

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erutarepmetegarotSgtsT 051+ot55–

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Package Dimensions

unit:mm

3017C-SIP9

[LA4510]

1.5

4.8

1.0

0.99

2.54

22.3

0.5

0.51min

1.3

SANYO : SIP9

3.0

5.7max

3.2

0.25

1.35

075Am

˚C ˚C

Operating Conditions at Ta = 25˚C

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0.35.4V 23ot423ot8

Operating Characteristics at Ta = 25˚C, VCC=3.0V, RL=4Ω, f=1kHz, See Sample Application Circuit 1.

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tnerructnecseiuQ

niagegatloVGVR1001= Ω 245484Bd

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OCC

2V,langisoN

%01=DHT002042Wm

k1=gR Ω zHk02otzH02=WB,2.05.0Vm

V5.4=5.851Am

V,zH001=

Vm05=7.0Vm

21500TN (KT)/41594HK/O147KI/2126KI/4225MW/D132KI, TS No.1161–1/8

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Ω

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Equivalent Circuit Block Diagram

Sample Application Circuit 1 : Speaker load

LA4510

Description of external parts

C1 (1µF) · Input capacitor (Coupling capacitor for input signal)

Decreasing the capacitance value lowers the frequency response at low frequencies.

C2 (22µF) · Feedback capacitor (Bypass of feedback signal)

Decreasing the capacitance value lowers the frequency response at low frequencies ; increasing the capacitance value makes the starting time latar.

C3 (4.7µF) · Muting capacitor

Decreasing the capacitance value makes the starting time earlier ; removing C3 causes pop noise. Increasing the capacitance value makes the starting time later.

C4 (220pF) · Phase compensation capacitor (Phase compensation by local feedback) Decreasing the capacitance

value causes the frequency response to extend at high frequencies, and thereby oscillation is liable to occur. Increasing the capacitance value worsens distortion factor at high frequencies.

C5 (0.47µF) · Oscillation blocking capacitor

Decreasing the capacitance value causes oscillation to liable to occur. Using an ordinary electrolytic capacitor may cause oscillation to occur at a low temperature. Use a tantalum or alsicon electrolytic capacitor that is good in temperature characteristic.

C6 (470µF) · Output capacitor (Cutoff of DC to speaker)

Decreasing the capacitanc value causes insufficient power at low frequencies.

C7 (220µF) · Bootstrap capacitor (Feedback from output stage)

Decreasing the capacitance value causes insufficient power at low frequencies, especially when voltage is reduced.

C8 (220µF) · Power capacitor (Drop in power impedance)

Decreasing the capacitance value causes motor noise, etc. to be entered easily. Removing C8 may cause oscillation to occur.

C9 (47µF) · Capacitor for ripple filter (Filter for bias voltage)

Decreasing the capacitance value causes the circuit to be subjected to the influence of power supply, and thereby ripple is liable to occur.

ri (100Ω) · Feedback resistor (Setting of voltage gain)

Decreasing the resistance value increases voltage gain, but worsens distortion factor, and thereby gain varies. Increasing the resistance value causes oscillation to liable to occur.

No.1161–2/8

LA4510

Setting of Starting Time

The LA4510 contains a muting circuit to be operated at the time of power switch ON/OFF. Thus, pop noise coming from power amplifier and preamplifier is rejected. The starting time depends on the capacitance value of feedback capacitor C2 as well as muting capacitor (C3).

V oltage Gain

Voltage gain depends on the ratio of internal resistance value (20kΩ) to external resistance value (R1). However, since setting of open loop voltage gain is a little on the low side (62dB) due to soft cliping, it is not recommendable to use the IC at a voltage gain greater than recommended. If the IC is used at a voltage gain less than recommended, take care not to cause oscillation to occur.

Action to Prevent Oscillation

If oscillation occurs, check C5. The larger the capacitance value is or the smaller the value of tan δ is if the capacitance value is the same, C5 acts more effectively against oscillation. Using an electrolytic capacitor as C5 may cause oscillation to occur at a low temperature. It is recommendable to use a tantalum or alsicon electrolytic capacitor that is good in temperature characteristic. For oscillation that occurs at a decreased voltage gain, increase the capacitance value of C4. If it is impossible for C4, C5 to act effectively against oscillation, add a ceramic capacitor of 470 to 1000pF across pin (4) and GND. In this case, distortion factor at high frequencies worsens to some extent.

No.1161–3/8

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