SANYO LA4422 Datasheet

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

5.8W typ AF Power Amplifier for Car Stereos, Car Radios

Ordering number:ENN556F

LA4422

SANYO Electric Co.,Ltd. Semiconductor Company

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

Features

• High gain (53dB typ.) and high output (5.8W typ).

• Soft clip.

• Small number of external parts (4 pcs).

• Bridge construction usable (PO=18W/RL=4Ω).

• Built-in thermal shutdown circuit against load short, over load.

• Built-in circuit to prevent pop noise at the time of power supply ON.

• SIP package (single ended pins) facilitating easy mounting.

Specifications

Absolute Maximum Ratings at Ta = 25˚C

* : 100×100×1.5mm3 Al heat sink used.

Operating Conditions at Ta = 25˚C

Operating Characteristics at Ta = 25˚C, VCC=13.2V, RL=4Ω, f=1kHz, 100×100×1.5mm3 Al heat sink.

Package Dimensions

unit:mm

3018A-SIP10FD

[LA4422]

25.5

24.0

12.0

3.6

16.7max

13.5

8.4

3.5

1.6min

1.32

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Continued on next page

3.6

0.45

1.6

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21500TH (KT)/O281TS/D177KI/5085MW/6250KI, TS No.556–1/10

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Equivalent Circuit Block Diagram

LA4422

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Proper Cares in Using IC

1. Maximum ratings Extreme caution should be excrcised when using the IC in the vicinity of the maximum ratings as a slight factor may cause the maximum ratings to be exceeded, thereby leading to a breakdown accident.

2. Pin-to-pin short If the power supply is truned ON with pin-to-pin short, a breakdown or de-gradation may occur. When installing the IC on the board, be sure to check that pin-to-pin area is not shorted with solder, etc. and turn ON the power supply.

3. Printed Circuit Board When designing the printed circuit board, make the power supply and ground lines thicker and shorter so that no feedback loop of input/output is formed. When using under the condition where the signal source impedance (Rg) is large, a stable operation against distortion is obtained by separating the input /output ground line at the root of GND pin [pin (8)]. The heat sink fin must be reliably connected to the external line of the same potential as pin (8) (GND).

No.556–2/10

LA4422

Functions of External Parts

The recommended number of external parts of the LA4422 is 4 pcs. as follows.

· Feedback capacitor from pin (5) CNF.

· Pin (7) to (10) bootstrap capacitor CBS.

· Output capacitor from pin (10) C

· High frequency parasitic oscillation compensating capacitor CX.

The fixed values of these parts are CNF=100µF, CBS=100µF, C when these values are changed. (a) Feedback capacitor C

If CNF is made smaller, the combined series impedance with RNF at a low frequency is increased, the amplification degree Avf is decreased, and the low cutoff frequency is made higher as seen from the following equation.

Avf=

VG=20log A vf (dB)

The ripple rejection is also lowered. It is possible, however, to make the starting time earlier at the time of the power supply switch ON. If CNF is made larger, these are reversed.

OUT

(RNF+ )

jωC

=1000µF, CX=0.15µF . We no w consider what will occur

OUT

(b) Bootstrap capacitor C

The low cutoff frequency may be somewhat influenced, but the drive at a low frequency is more influenced. If CBS is made smaller, power at a low frequency may be reduced. Therefore, CBS should be more than 47µF.

OUT

The low cutoff frequency may be somewhat influenced, but the most influence is that power is reduced as the impedance at a low frequency is increased. Therefore, C

should be determined by the power band width. 470µF min. is

OUT

required.

(d) High frequency parasitic oscillation compensating capacitor CX.

CX should be a polyester film capacitor of good frequency characteristic. If a ceramic capacitor is used, oscillation may occur.

Features of IC System and Functions of Remaining Pins

· Since the input circuit uses pnp and the input potential is designed to be 0 bias, no input coupling capacitor is needed and

the direct coupling is available.

· The thermal shutdouwn protection circuit is built in to prevent breakdown or degradation attributable to generation of heat

at the time of load short or overload.

· The overvoltage protection circuit is built in to protect the IC from breaking down when a surge is applied to the power

supply line.

· The prevention circuit is provided to prevent pop noise which occures when the power supply is turned ON.

· The voltage gain of open loop is lo wered and the nagative feedback is made smaller to obtain a soft clip. Radiation to the

high frequency circuit and stability are considered.

· The feedback resistor Rf is set up at such a large value as 40kΩ and the cutof f frequency point fL is considered so that the

frequency characteristic is fully externded to a low frequency even if the capacity of capacitor CNF is small.

· The high frequency parasitic oscillation compensating capacitor is built in as a means to reduce the number of external

parts. Therefore, the high cutoff frequency point fH is fixed.

· The feedback resistor RNF is built in and the voltage gain is fixed to be 53dB in order to reduce the number of external

parts and to minimize the variations of voltage gain. Pins (5) and (6) are provided to control the voltage gain externally. The voltage gain is lowered by inserting a resistor in series with pin (5). The voltage gain is increased by inserting a resistor between pin (5) and (6). If CR are connected to pin (6), the voltage gain is freely controlled through pin (6) alone.

· Pin (4) is provided as a decoupling pin.

Even if the power suppy is turned ON/OFF in succession, pop noise is minimized by connecting a capacitor to this pin, provided that a condition CD≥CNF is recommended. CNF is related to the starting time. The ripple rejection is improved by connecting the decoupling capacitor CD.

No.556–3/10

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