NJU8755

NJU8755 PRELIMINARY Analog Signal Input Stereo Class D Power Amplifier ! GENERAL DESCRIPTION The NJU8755 is an analog signal input stereo class D power amplifier. The NJU8755 includes Inversion operational amplifier input circuit, PWM modulators, an output-short protector and a low voltage detector. The NJU8755 incorporates BTL amplifiers, which eliminate AC coupling capacitors, capable of driving up to 1.2W/channel with simple external LC low-pass filters. Class-D operation achieves high power-efficiency, which achieves longer battery life for battery powered applications, thus the NJU8755 is suited for portable audio, note-PC, etc. ! PACKAGE OUTLINE NJU8755V ! FEATURES ! PIN CONFIGURATION # # # # # # # # 2-Channel Analog Signal Input 2-Channel BTL Outputs :1.2W/channel Standby(Hi-Z), Mute Control Built-in Short Protector Built-in Low Voltage Detector Operating Voltage 2.7 ~ 5.25V CMOS Technology Package Outline SSOP20 at 5V into 8Ohms VDD INL TEST MUTE VDDL OUTLP VSSL OUTLN VDDL ! BLOCK DIAGRAM VDD VDDL VSS 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 INL COM INR - + Pulse Width - Modulator + + - Pulse Width + Modulator - Short Protector VSS INR COM STBY VDDR OUTRP VSSR OUTRN VDDR VDDR VDDL OUTLP VSSL VDDL OUTLN VSSL VDDR OUTRP VSSR VDDR OUTRN VSSR Soft Start Control Logic Low Voltage Detector MUTE STBY TEST Ver.2003-03-12 -1- NJU8755 ! PIN DESCRIPTION No. SYMBOL I/O FUNCTION 1 VDD − Power Supply : VDD=5.0V 2 INL I L-c...