BA5416 Просмотр технического описания (PDF) - ROHM Semiconductor

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производитель

BA5416

High-output dual power amplifier

ROHM Semiconductor 

Audio ICs

FOperation notes

(1) Input circuit

The structure of the input circuit is shown in Fig. 4. The

IC can be used without coupling capacitors, but a maxi-

mum of 0.5µA of bias current (IBIN) flows from the input

pin, so if potentiometer sliding noise results from this,

connect an input capacitor CIN as shown below.

To prevent degradation of the IC characteristics, the input

bias resistor is not built into the IC. Connect an input bias

resistor (RIN) between the input and GND (the recom-

mended value is about 33kΩ).

BA5415A / BA5416

(3) Oscillation countermeasures

We recommend that the capacitor (C1) connected be-

tween the B. S pin and the VCC pin for oscillation preven-

tion be a metal-film component with good temperature

and high-frequency characteristics.

Ceramic capacitors have poor temperature characteris-

tics, so if used, allow sufficient oscillation margin. It is

also possible to connect a capacitor for oscillation pre-

vention between the output and GND (C2).

The oscillation margin depends on the PCB pattern and

the mounting position of the capacitor. Design your PCB

after referring to the application example PCB.

(2) Gain adjustment

The gain is given by the following formula.

RNF)RF

GV = 20log RF

It is possible to reduce the gain by increasing RF, but the

amount of feedback will increase, and oscillation will be

more likely to occur. We recommend that you set the gain

to 30dB or higher.

(4) VCC and GND lines

The Pre. GND and Pow. GND are joined at pin 12, so

there is a chance of crosstalk or degraded distortion per-

formance due to common ground impedance in the PCB

pattern. In addition, the power supply capacitor con-

nected between VCC and GND is influenced by the PCB

pattern, and common VCC and GND impedance may de-

grade the ripple rejection and distortion. Design the PCB

after referring to the application example PCB (the rec-

ommended value for the power supply capacitor is

1000µF of greater).

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