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NJU8754 Datasheet(PDF) 3 Page - New Japan Radio |
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NJU8754 Datasheet(HTML) 3 Page - New Japan Radio |
3 / 6 page NJU3555 NJU8754 -3 - Ver.2003-03-12 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. |
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