LV4985VH 查看數據表（PDF） - SANYO -> Panasonic

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LV4985VH

For Portable Electronic Device Use 1.2W × 2ch BTL Power Amplifier

SANYO -> Panasonic 

LV4985VH

9. Electronic volume control (pin 10 control)

By changing voltage applied to the pin 10, the voltage gain of the built-in VCA(variable control amplifier) is varied.

Since the ripple component of applied voltage is generated, a stabilized power source must be used.

When controlling the amplifier using the PWM signal from the CPU, use a resistor and capacitor for DC conversion as

shown in Figure 4 and adjust the voltage gain by changing the pulse width of PWM signal. In this case, the frequency

of PWM signal used must be higher than audio frequency band.

PWM output

CPU

PWM signal

R7

C8 R8

10 VOL

LV4985VH

Discharge resistor

Fig. 4

10. Thermal protection circuit

The IC has a built-in thermal protection circuit that can reduce the risk of breakdown or degradation when the IC

becomes abnormally hot for some reason. When the internal chip junction temperature Tj rises to approximately 170°C,

this protective circuit operates to cut off the power supply to the power amplifier block and stop signal output.

Operation recovers automatically when the chip temperature drops to approximately 130°C.

Note that this circuit cannot always prevent breakdown or degradation, so sufficient care should be taken for using the

IC. When the chip becomes abnormally hot, immediately turn off the power and determine the cause.

11. Short-circuit between pins

Turning on the power supply with the short-circuit between terminals leads to the deterioration and destruction of IC.

When fixing the IC to the substrate, please check that the solder is not short-circuited between the terminals before

turning on the power.

12. Load Short-circuit

Leaving the IC in the load short-circuit for many hours leads to the deterioration and destruction of the IC.

The load must not be short-circuited absolutely.

13. Maximum rating

When the rated value used is just below to the absolute maximum ratings value, there is a possibility to exceed the

maximum rating value with slight extrusion variable. Also, it can be a destructive accident.

Please use within the absolute maximum ratings with sufficient variation margin of supply voltage.

In addition, the package of this IC has low thermal radiation characteristics, so secure sufficient thermal radiation by

providing a copper foil land on the printed circuit board near the heat sink.

No.A1568-10/15

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