NJU8754 查看數據表（PDF） - Japan Radio Corporation

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NJU8754

Analog Signal Input Monaural Class D Power Amplifier

Japan Radio Corporation  

NJU3857554

FUNCTIONAL DESCRIPTION

(1) Signal Output

The OUTP and OUTN generate PMW output signal, which will be converted to analog signal via external

2nd-order or higher LC filter. A switching regulator with a high response against a voltage fluctuation is the best

selection for the VDDO, which is the power supply for output driver. To obtain better T.H.D. performance, the

stabilization of the power is required.

(2) Standby

By setting the STBY pin to “L”, the standby mode is enabled. In the standby mode, the entire functions of the

NJU8754 enter a low-power state, and the output pins(OUTP and OUTN) are in high impedance.

(3) Mute

By setting the MUTE pin to “L”, the Mute function is enabled, and the output pins(OUTP and OUTN) output

square wave(Duty: 50%).

(4) Low Voltage Detector

When the power supply voltage drops down to below VDD(MIN), the internal oscillation is halted not to

generate unwanted frequency, and the output pins(OUTP and OUTN) become in high impedance.

(5) Short Protection Circuit

The short protector, which protects the NJU8754 from high short-circuit current, turns off the output driver.

After about 5 seconds from the protection, the NJU8754 returns to normal operation. The short protector is

enabled in response to following accidents.

Short between OUTP and OUTN

Short between OUTP and VSS

Short between OUTN and VSS

Note 1) The detectable current and the period for the protection depend on the power supply voltage and

ambient temperature.

Note 2) The short protector is not effective for a long term short-circuit but for an instantaneous accident.

Continuous high-current may cause permanent damage to NJU8754.

Ver.2003-03-12

-3-

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