NJU8752V-TE1

NJU8752/52B NJU3555 PRELIMINARY Analog Signal Input Class D Amplifier for Piezo Speaker ! PACKAGE OUTLINE ! GENERAL DESCRIPTION The NJU8752/NJU8752B is an analog signal input monaural class D amplifier for Piezo speaker. The NJU8752/52B includes Inversion operational amplifier input circuit, PWM modulator, an output-short protector and a low voltage detector. Input part operates on 3.3V(TYP) as power supply and Output part operates up to 16.0V(MAX). Therefore, it drives Piezo speaker with louder sound and High efficiency. The NJU8752/52B incorporates BTL amplifier, which eliminate AC coupling capacitors, capable of driving Piezo speaker with simple external LC low-pass filters. Class D operation achieves lower power operation for Piezo speaker, thus the NJU8752/52B is suited for battery powered applications. NJU8752V / 52BV NJU8752BKM1 ! FEATURES # # # # # # # # # NJU8752BKP4 Piezo Speaker Driving 1-channel Analog Signal Input, 1-channel BTL Output Standby(Hi-Z), Mute Control Voltage Gain 31dB(NJU8752) 20dB(NJU8752B) Built-in Low Voltage Detector Built-in Short Protector Operating Voltage Input: 2.7 ~ 3.6V (NJU8752) 3.1 ~ 3.6V (NJU8752B) Output: 6.0 ~ 16.0V C-MOS Technology Package Outline SSOP14 (NJU8752 / 52B) QFN20 / QFN28 (NJU8752B) VSS COM TEST 2 STBYB VSS OUTN VDDO 20 NC VDD NC VSS NC SSOP14 (NJU8752V / 52BV) 1 COM TEST 2 STBYB VSS OUTN 1 COM NC TEST 2 STBYB VSS NC OUTN IN TEST 1 MUTEB NC VSS NC OUTP QFN28 (NJU8752BKP4) VDDO VDDO NC VDDO VDDO IN TEST 1 MUTEB VSS OUTP 28 VDDO VDDO NC NC NC VDDO VDDO 14 13 12 11 10 9 8 1 2 3 4 5 6 7 VDD IN TEST 1 MUTEB VSS OUTP VDDO NC NC VDD NC VSS NC NC ! PIN CONFIGURATION QFN20 (NJU8752BKM1) Ver.2004-08-05 -1- NJU8752/52B ! BLOCK DIAGRAM VDD VSS VDDO IN OUTP + VSS Pulse Width Modulator - VDDO OUTN + COM VSS Short Protector Soft Start Control Low Voltage Detector Logic MUTEB TEST 1 STBYB TEST 2 ! PIN DESCRIPTION SSOP14 1 2 No. QFN20 19 1 QFN28 26 1 3 2 4 SYMBOL I/O VDD IN − I 2 TEST 1 I 3 3 MUTEB I 5,10,14 6 7,8 9 4,12,17 5 6,7,9,10 11 5,17,24 7 8,9,13,14 15 VSS OUTP VDDO OUTN − O − O 11 13 18 STBYB I 12 14 19 TEST 2 I Function Power Supply: VDD=3.3V Signal Input Maker test 1 This pin must be connected to GND. Mute Control Low : Mute ON High : Mute OFF Power GND: VSS=0V Positive Output Output Power Supply : VDDO=16.0V max. Negative Output Standby Control Low : Standby ON High : Standby OFF Maker test 2 This pin must be connected to GND. Analog common 21 COM − 4,6,10,11, Non connection − 8,16,18,20 12,16,20,22, NC − 23,25,27,28 *VSS(SSOP14:Pin No.5,10,14, QFN20:Pin No.4,12,17, QFN28:Pin No.5,17,24) should be connected at a nearest point to the IC. *VDDO(SSOP14:Pin No.7,8, QFN20:Pin No.6,7,9,10, QFN28:Pin No.8,9,13,14) should be connected at a nearest point to the IC. *MUTEB(SSOP14: Pin No.4, QFN20, QFN28:Pin No.3) and STBYB(SSOP14:Pin No.11, QFN20:Pin No.13, QFN28:Pin No.18) must be connected to VDD, when these pins are not used. 13 -2- 15 Ver.2004-08-05 NJU8752/52B NJU3555 ! FUNCTIONAL DESCRIPTION (1) Signal Output The OUTP and OUTN generate 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 VDDO, 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 STBYB pin to “L”, the standby mode is enabled. In the standby mode, the entire functions of the NJU8752/52B enter a low-power state, and the output pins (OUTP and OUTN) are high impedance. (3) Mute By setting the MUTEB pin to “L”, the Mute function is enabled. In the Mute mode, 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 for prevention to generate unwanted frequency, and the output pins (OUTP and OUTN) become in high impedance. (5) Short Circuit Protection The short protector, which protects the NJU8752/52B against high short-circuit current, turns off the output driver. After about 5 seconds from the protection, the NJU8752/52B returns to normal operation. The short protector functions at the following accidents. • Short • Short • Short between OUTP and OUTN between OUTP and VSS 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 the NJU8752/52B. Ver.2004-08-05 -3- NJU8752/52B ! ABSOLUTE MAXIMUM RATINGS (Ta=25°C) PARAMETER SYMBOL RATING UNIT Supply Voltage VDD VDDO -0.3 ~ +4.0 -0.3 ~ +18.0 V V Input Voltage Operating Temperature Storage Temperature SSOP14 Power Dissipation QFN20 QFN28 Vin Topr Tstg -0.3 ~ VDD+0.3 V -40 ~ +85 °C -40 ~ +125 °C 450 PD mW 620 640 * : Mounted on two-layer board of based on the JEDEC. Note 1) All voltage are relative to “VSS =0V” reference. Note 2) The LSI must be used inside of the “Absolute maximum ratings”. Otherwise, a stress may cause permanent damage to the LSI. Note 3) De-coupling capacitors for VDD-VSS and VDDO-VSS should be connected for stable operation. ! ELECTRICAL CHARACTERISTICS -NJU8752(Ta=25°C, VDD=3.3V, VDDO=12.0V, VSS=0V,Input Signal=1kHz, Input Signal Level=200mVrms, Frequency Band=20Hz~20kHz, Load Impedance=0.8µF, 2nd-order 34kHz LC Filter(Q=0.75)) PARAMETER VDD Supply Voltage VDDO Supply Voltage Input Impedance Voltage Gain Output THD Maximum Output S/N Dynamic Range Maximum Mute Attenuation Operating Current(Stanby) Operating Current (No signal input) Input Voltage Input Leakage Current -4- SYMBOL VDD VDDO ZIN AV THD Vo SN Drange MAT IST IDD VIH VIL ILK CONDITIONS IN pin Input Signal Level =200mVrms Output THD=10% A weight A weight No-load operating No Signal Input MUTEB, STBYB pins MUTEB, STBYB pins MUTEB, STBYB pins MIN 2.7 6.0 - TYP 3.3 12.0 20 31 MAX 3.6 16.0 - UNIT V V kΩ dB Note - 0.05 0.08 % 4 7 90 - 10 80 83 - 1 Vrms dB dB dB µA - 3.5 10 mA 0.7VDD 0 - - VDD 0.3VDD ±1.0 V V µA 4 4 Ver.2004-08-05 NJU8752/52B NJU3555 -NJU8752B(Ta=25°C, VDD=3.3V, VDDO=12.0V, VSS=0V,Input Signal=1kHz, Input Signal Level=700mVrms, Frequency Band=20Hz~20kHz, Load Impedance=0.8µF, 2nd-order 34kHz LC Filter(Q=0.75)) SYMBOL VDD VDDO ZIN AV PARAMETER VDD Supply Voltage VDDO Supply Voltage Input Impedance Voltage Gain THD Output THD Maximum Output S/N Dynamic Range Maximum Mute Attenuation Operating Current(Stanby) Operating Current (No signal input) Input Voltage Input Leakage Current Vo SN Drange MAT IST IDD VIH VIL ILK CONDITIONS IN pin Input Signal Level =700mVrms Output THD=10% A weight A weight No-load operating No Signal Input MUTEB, STBYB pins MUTEB, STBYB pins MUTEB, STBYB pins MIN 3.1 6.0 - TYP 3.3 12.0 20 20 MAX 3.6 16.0 - UNIT V V kΩ dB Note - 0.05 0.08 % 4 7 - 10 80 83 90 - 1 Vrms dB dB dB µA - 3.5 10 mA 0.7VDD 0 - - VDD 0.3VDD ±1.0 V V µA 4 4 Note 4) Test system of the output THD, S/N and Dynamic Range The output THD, S/N and dynamic range are tested in the system shown in Figure 1, where a 2nd-order LC LPF and another filter incorporated in an audio analyzer are used. Input Signal NJU8752/52B 2nd-order LC LPF NJU8752/52B Test Board Filter 20kHz (AES17) THD Measuring Apparatus Audio Analyzer Figure 1. Output THD, S/N and Dynamic Range Test System 2nd-order LPF Filters Ver.2004-08-05 : Refer to “Typical Application Circuit”. : 22Hz HPF + 20kHz LPF(AES17) (with the A-Weight filter for S/N and Dynamic-range tests) -5- NJU8752/52B ! TYPICAL APPLICATION CIRCUIT •LLB2520 is manufactured by TOKO, INC. For detail information, please refer its technical papers. VDD 10µF 0.1µF 5~10Ω OUTP(6) VDD(1) 2.2µF IN IN(2) COM(13) 0.01µF 10µF MUTEB(4) STBYB(11) NJU8752/52B VSS(14) 3.3kΩ 2.2µF IN IN(1) COM(15) 0.01µF 10µF MUTEB(3) STBYB(13) TEST1(2) TEST2(14) Figure 2.2 -6- LLB2520 33~47µH 0.1µF 10µF 0.1µF 10µF 0.5~2µF 0.1µF VDDO VSS(5) 5~10Ω LLB2520 33~47µH 5~10Ω LLB2520 33~47µH OUTP(5) VDD(19) VSS(17) 3.3kΩ 5~10Ω VDDO Application Circuit example (SSOP14) NJU8752/52B VDD VDDO(7) Piezo Speaker 0.1µF VSS(10) TEST2(12) 10µF 0.1µF OUTN(9) VDDO(8) TEST1(3) Figure 2.1 LLB2520 33~47µH OUTN(11) VDDO(6,7) Piezo Speaker 0.1µF 0.1µF 10µF 0.1µF 10µF 0.5~2µF 0.1µF VDDO VSS(4) VDDO(9,10) VDDO VSS(12) Application Circuit example (QFN20) Ver.2004-08-05 NJU8752/52B NJU3555 •LLB2520 is manufactured by TOKO, INC. For detail information, please refer its technical papers. VSS(24) 2.2µF 3.3kΩ IN IN(1) COM(21) 0.01µF 10µF MUTEB(3) STBYB(18) TEST1(2) TEST2(19) Figure 2.3 LLB2520 33~47µH 5~10Ω LLB2520 33~47µH OUTP(7) VDD(26) NJU8752/52B VDD 10µF 0.1µF 5~10Ω OUTN(15) VDDO(8,9) Piezo Speaker 0.1µF 0.1µF 10µF 0.1µF 10µF 0.5~2µF 0.1µF VDDO VSS(5) VDDO(13,14) VDDO VSS(17) Application Circuit example (QFN28) Note 5) De-coupling capacitors must be connected between each power supply pin and GND. The capacity value should be adjusted on the application circuit and the operation temperature. It may malfunction if capacity value is small. Note 6) The power supply for VDDO require fast driving response performance such as a switching regulator for better THD. THD performance becomes worse by ripple if the capacity of De-coupling capacitors is small. Note 7) The above circuit shows only application example and does not guarantee the any electrical characteristics. Therefore, please test the circuit carefully to fit your application. The cutoff frequency of the LC filter influences the quality of sound. The Q factor of the LC filter must be less than “1”. Otherwise, the operating current increase when the frequency of input signal is closed to the cutoff frequency. Note 8) The transition time for MUTEB and STBYB signals must be less than 100µs. Otherwise, a malfunction may be occurred. Note 9) (1)-(26) indicates pin number. [CAUTION] The specifications on this databook are only given for information , without any guarantee as regards either mistakes or omissions. The application circuits in this databook are described only to show representative usages of the product and not intended for the guarantee or permission of any right including the industrial rights. Ver.2004-08-05 -7-