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Details, datasheet, quote on part number:NJU8754
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| Part: | NJU8754 |
| Category: | Multimedia => Audio => Amplifiers => Power Amplifiers => Class D Amplifier |
| Description: | Analog Signal Input Monaural Class D Power Amplifier |
| Company: | NJR Corporation |
| Datasheet: | Download NJU8754 datasheet File size : 92 kB |
| Request For quote: | Find where to buy NJU8754
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Datasheet text preview:
NJU8754
PRELIMINARY
Analog Signal Input Monaural Class D Power Amplifier
GENERAL DESCRIPTION The NJU8754 is an analog signal input monaural class D power amplifier. The NJU8754 includes Inversion operatinal amplifier input circuit, PWM modulator, an output-short protector and a low voltage detector. The NJU8754 incorporates BTL amplifier, which eliminate AC coupling capacitors, capable of driving up to 0.6W at 3.6V supply voltage with simple external LC low-pass filters. The NJU8754 features high power-efficiency by class-D operation and very small package, and is suited for cellular phone, PDA, etc. FEATURES Monaural Analog Signal Input Monaural BTL Output :1.2W at 5V into 8Ohms :0.6W at 3.6V into 8Ohms Standby(Hi-Z), Mute Control Built-in Short Protector Built-in Low Voltage Detector Operating Voltage :2.7 ~ 5.25V CMOS Technology Package Outline :SSOP10, QFN20 PACKAGE OUTLINE
NJU8754V
NJU8754KM1
PIN CONFIGURATION
15 16
NC OUTP VDDO OUTN NC QFN20
11 10
VDD IN COM MUTE STBY
1 2 3 4 5 SSOP10
10 9 8 7 6
VSS OUTP VDDO OUTN VSS
VSS VSS NC VDD NC
20
VSS VSS NC STBY NC NC IN COM MUTE NC
1 5 6
Ver.2003-03-12
-1-
NJU8754
BLOCK DIAGRAM
VDD
VSS
IN
+ Pulse Width Modulator
OUTP VDDO OUTN
COM
+
Short Protection
Soft Start
Control
Logic
Low BATT Protection
MUTE
STBY
PIN DESCRIPTION No. SSOP10 1 2 3 QFN20 19 2 3 SYMBOL VDD IN COM I/O - I - FUNCTION
Power supply : VDD=3.6V Signal input Analog common Mute control 4 4 MUTE I Low : Mute ON High : Mute OFF Standby control 5 7 STBY I Low : Standby ON High : Standby OFF 6 9,10 VSS - Power GND : VSS=0V 7 12 OUTN O Negative output 8 13 VDDO - Output power supply 9 14 OUTP O Positive output 10 16,17 VSS - Power GND : VSS=0V - 1,5,6,8,11,15,18,20 NC - Non connection *The relations of "VSS= 0V" and "VDD= VDDO" must be maintained. *VSS(SSOP10:Pin No.6,10, QFN20:Pin No.9,10,16,17) should be connected at a nearest point to the IC. *VDDO(SSOP10:Pin No.8, QFN20:Pin No.13) should be connected at a nearest point to the IC. *MUTE(SSOP10, QFN20:Pin No.4) and STBY(SSOP10:Pin No.5, QFN20:Pin No.7) must be connected to VDD, when these pins are not used.
-2-
Ver.2003-03-12
NJU8754 NJU3555
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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