Sanyo LA4265 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

3.5W Monaural Power Amplifier

Ordering number:ENN1463C

LA4265

SANYO Electric Co.,Ltd. Semiconductor Company

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

Features

• Minimum number of external parts requierd (No input capacitor, bootstrap capacitor requierd).

• High output : 3.5W typ (VCC=16V, RL=8Ω, THD=10%).

• Soft clip, causing little harmonic disturbance to radios.

• Small pop noise at the time of power switch ON/OFF.

• Built-in protector against abnormal modes (Thermal shut-

Package Dimensions

unit:mm

3018A-SIP10FD

[LA4265]

25.5

24.0

12.0

3.6

down, overvoltage)

16.7max

13.5

8.4

3.5

Specifications

1.32

1.6min

2.54

0.5

1.3

101

SANYO : SIP10FD

Absolute Maximum Ratings at Ta = 25˚C

retemaraPlobmySsnoitidnoCsgnitaRtinU egatlovylppusmumixaMV tnerructuptuomumixaMI

noitapissidrewopelbawollAxamdP001htiW × 021 × mm5.1

erutarepmetgnitarepOrpoT 57+ot02–

erutarepmetegarotSgtsT 051+ot04–

xam 52V

kaep 2A

knistaehlA5.7W

Operating Conditions at Ta = 25˚C

retemaraPlobmySsnoitidnoCsgnitaRtinU

egatlovylppusdednemmoceRV

ecnatsiserdaoldednemmoceRR

egnaregatlovylppusgnitarepOV

Operating Characteristics at Ta = 25˚C, VCC=16V, RL=8Ω, f=1kHz, Rg=600Ω, See specified test circuit

(based on sample application circuit).

retemaraPlobmySsnoitidnoC

tnerructnecseiuQI

niagegatloVGV840525Bd

rewoptuptuOP

noitrotsidcinomrahlatoTDHTPOW5.0=3.00.1%

egatlovesiontuptuOV

noitcejerelppiRRRVSf,0=gR

OCC

%01=DHT0.35.3W

k01=gR Ω zHk02otzH02=FPB,56.05.1Vm

V,zH001=

V5.0=0405Bd

nimpytxam

sgnitaR

5305Am

3.6

0.45

1.6

˚C ˚C

61V

Ω

8 42ot9V

tinU

21500TH (KT)/33194HO/0237KI/8064KI/4034KI, TS No.1463–1/8

LA4265

Equivalent Circuit Block Diagram

Sample Application Circuit 1 Sampl Application Circuit 2

(Recommended circuit) (Circuit with minimum number of external parts)

Sample Printed Circuit Pattern

No.1463–2/8

LA4265

Description of External Parts

C1 (330pF) : Input short capacitor

Reduces the high frequency noise when the input impedance is increased. Not required when the input impedance is decreased.

C2 (100µF) : Feedback capacitor

Decreasing the capacitance value lowers the low frequency response. Increasing the capacitance value makes the starting time later.

C3 (0.1µF : Oscillation blocking capacitor polyester film Decreasing the capacitance value causes oscillation to occur easily. Use a polyester film capacitor that is capacitor) good in high frequency response and temperature characteristic. The use of an electrolytic capacitor may

cause oscillation to occur at low temperatures.

C4 (470µF) : Output capacitor

Decreasing the capacitance value causes insufficient power at low frequencies.

C5 (470µF) : Power capacitor

Decreasing the capacitance value causes ripple to occur easily. Locating at a distance from the IC or removing this capacitor may cause oscillation to occur.

C6 (100µF) : Ripple filter capacitor

Decreasing the capacitance value excessiv ely or remo ving this capacitor causes ripple to occur. Howe v er, increasing the capacitance value does not always cause ripple to be reduced. Decreasing the capacitance value makes the starting time earlier.

R1 (100kΩ) : Input bias resistor

Determines the bias (bias of zero potential) to be applied to the input pin and the input impedance. Not required if a variable resistor is also used as this resistor.

R2 (3.3Ω) : Resistor connected in series with oscillation blocking capacitor

Prevents phase shift attributable to the oscillation blocking capacitor so that oscillation is hard to occur.

Note for Changing Voltage Gain

The voltage gain can be reduced by adding an external resistor (RNF) in series with the feedback capacitor. (See VG · R characteristic curve). Howe v er , it should be noted that v arious character istics are also changed (THD-VG, VNO-VG, VroVG). The voltage gain must not be reduced to be less than 30dB. Since the frequenc y response is extended and oscillation is liable to occur when the voltage gain is reduced, high-cut must be made as required. (High-cut is made by connecting a capacitor of approximately 30pF across pins (6) and (7).)

External Muting

If external muting is required, make the circuit as shown on next pag e. In this case, the pop noise is similar to that which occurs at the time of power switch ON/OFF. If the value of the series resistor is decreased, more pop noise is heard at the time of attack ; if increased, muting is hard to work.

Measure against Fold-back of Output Waveform

Since the input pin is zero-biased, the circuit may be saturated at an overinput, causing a part of the output wa veform to be folded back (e. g. when the peak input voltage exceeds 600mV). In such a case, the fold-back of the wav eform can be prevented by using the built-in diode (also can be prevented by using an external diode). When the b uilt-in diode is used, a resistor must be connected in series with the input pin to cause the diode to conduct no overcurrent (10mA or less).

No.1463–3/8

+ 5 hidden pages