LA4625-E Ver la hoja de datos (PDF) - ON Semiconductor

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componentes Descripción

Fabricante

LA4625-E

2-channel 13.5W BTL Audio Power Amplifier

ON Semiconductor 

LA4625

Pin Voltages

VCC = 12V, with 5V applied to STBY through a 10kΩ resistor, RL = 4Ω, Rg = 0

Pin No.

1

2

3

4

5

Pin name

IN1

DC

PRE-GND

STBY

ON TIME

Pin voltage

1.46V

5.18V

0V

3.21V

2.26V

6

IN2

1.46V

7

POP

2.05V

Pin No.

Pin name

Pin voltage

8

+OUT2

5.21V

9

−OUT2

5.21V

10

PWR-GN

0V

11

+OUT1

5.21V

12

PWR-GN

0V

13

−OUT1

5.21V

14

VCC

12V

External Components

C1 and C4: Input capacitors. A value of 2.2μF is recommended. Determine the polarity based on the DC potential of

the circuit connected directly to the LA4625 front end. Note that the low band response can be adjusted by

varying fL with the capacitors C1 and C4.

C2

: Decoupling capacitor (ripple filter)

C3

: Sets the amplifier starting time, which will be approximately 0.6 seconds for a value of 33μF. The starting

time is proportional to the value of this capacitor, and can be set to any desired value.

C5

: Power-supply capacitor

C6, C7, C8, and C9 :

Oscillation prevention capacitors. Use polyester film capacitors (Mylar capacitors) with excellent

characteristics. (Note that the series resistors R2, R3, R4, and R5 are used in conjunction with these

capacitors to achieve stable amplifier operation.) A value of 0.1μF is recommended.

C10 : Impulse noise reduction capacitor. A value of 0.47μF is recommended. Caution is required when selecting

the value for this capacitor, since increasing its value influences the operation of the circuits that protect

against shorting the amplifier output pins to VCC or to ground when higher VCC voltages (approximately

16V or higher) are used.

R1

: Standby switch current limiting resistor. A value of 10kΩ is recommended when a voltage in the range 2.5 to

12V will be applied as the standby switching voltage. Note that this resistor is not optional: it must be included.

IC Internal Characteristics and Notes

1. Standby function

• Pin 4 is the standby switch. A voltage of 2.5V or

higher must be applied through an external resistor to

turn the amplifier on.

• If a voltage of over 12V will be applied as the

standby mode switching voltage, use the following

formula to determine the value of R1 so that the

current entering at pin 4 remains under 500μA.

Pin 4 Internal Equivalent Circuit

500μA or lower

4

R1

10kΩ

Applied standby

voltage

About 1.4V

(2VBE)

R1 =

<applied voltage> − 1.4

500μA

− 10kΩ

2. Muting function

• Pin 5 connects the capacitor that determines the starting time to prevent impulse noise. It can also be used to mute

the amplifier output by shorting pin 5 to ground. When this function is used, the recovery time depends on C3.

3. Impulse noise improvements

• While the LA4625 achieves a low level of impulse noise, if even further reductions in impulse noise at power

on/off (and when switching into or out of standby mode) a 0.47μF capacitor may be inserted between pin 7 and the

PRE GND pin (pin 3). (Pin 7 is the output amplifier bias pin. Since the ability to withstand shorting the output pins

to VCC or ground is reduced for supply voltages over 16V if the pin 7 capacitance is large, we recommend a value

of 0.47μF or lower for this capacitor.)

No.6631-4/8

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