NJU8754 Просмотр технического описания (PDF) - Japan Radio Corporation

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NJU8754

Analog Signal Input Monaural Class D Power Amplifier

Japan Radio Corporation  

NJU8754

ABSOLUTE MAXIMUM RATINGS

PARAMETER

Supply Voltage

Input Voltage

Operating Temperature

Storage Temperature

Power Dissipation

SYMBOL

VDD

VDDO

Vin

Topr

Tstg

PD

RATING

-0.3 ~ +5.5

-0.3 ~ +5.5

-0.3 ~ VDD+0.3

-40 ~ +85

-40 ~ +125

250 (SSOP10)

TBD(QFN20)

(Ta=25°C)

UNIT

V

V

V

°C

°C

mW

Note 1) All voltage are relative to “VSS= 0V” reference.

Note 2) The LSI must be used inside of the “Absolute maximum ratings”. Otherwise, a stress may cause

permanent damage to the LSI.

Note 3) De-coupling capacitors for VDD-VSS and VDDO-VSS should be connected for stable operation.

Note 4) Power Dissipation

The class-D amplifiers are more power efficient, and dissipate power less than general

analog-amplifiers. In theory, the NJU8754 actualize quite high output-power such as 1.2W at =5V

operation with 8ohms load, it looks as if the NJU8754 exceeds the absolute maximum rating of the power

dissipation. However, in practice, the effective output-power of usual music sound is only about 1/10 of its

maximum output power, thus it may never exceed the absolute maximum rating.

The maximum power dissipation in the system is calculated, as shown below.

Pdmax(W) = (Tjmax(°C) - Ta(°C)) /θja

Pdmax: Maximum Power Dissipation, Tjmax: Junction Temperature = 125°C

Ta: Ambient Temperature, θja: Thermal Resistance of package(SSOP10) = 400°C/W

Power dissipation of the NJU8754 itself is calculated, as shown below.

Pd(W) = PO(W) X RO(Ω) / RL(Ω) + PdIC(W)

Pd: Power Dissipation, PO: Output Power, RO: Internal Resistance(output driver)

RL: Load Resistance, PdIC: Power of internal circuit

-4-

Ver.2003-03-12

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