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NJU8755 Datasheet(PDF) 3 Page - New Japan Radio |
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NJU8755 Datasheet(HTML) 3 Page - New Japan Radio |
3 / 6 page NJU3555 NJU8755 -3 - Ver.2003-03-12 ! FUNCTIONAL DESCRIPTION (1) Signal Output The OUTLP/LN and OUTRP/RN generate respectively L-channel and R-channel PWM output signals, 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 VDDL and VDDR, which are the power supply for output drivers. To obtain better THD 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 NJU8755 enter a low-power state, and the output pins(OUTLP/LN and OUTRP/RN) are high impedance. (3) Mute By setting the MUTE pin to “L”, the Mute function is enabled. In the Mute mode, the output pins(OUTLP/LN and OUTRP/RN) 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 for prevention to generate unwanted frequency, and the output pins(OUTLP/LN and OUTRP/RN) become in high impedance. (5) Short Circuit Protection The short protector, which protects the NJU8755 against high short-circuit current, turns off the output drivers of L-channel and R-channel independently. After about 5 seconds from the protection, the NJU8755 returns to normal operation. The short protector functions at following accidents. • Short between OUTLP and OUTLN • Short between OUTLP and VSSL • Short between OUTLN and VSSL • Short between OUTRP and OUTRN • Short between OUTRP and VSSR • Short between OUTRN and VSSR 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 NJU8755. |
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