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Details, datasheet, quote on part number:NJU8752
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| Part: | NJU8752 |
| Category: | Multimedia => Audio => Amplifiers => Power Amplifiers => Class D Amplifier |
| Description: | Analog Signal Input Class D Amplifier For Piezo Speaker |
| Company: | NJR Corporation |
| Datasheet: | Download NJU8752 datasheet File size : 82 kB |
| Request For quote: | Find where to buy NJU8752
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Datasheet text preview:
NJU8752
PRELIMINARY
Analog Signal Input Class D Amplifier for Piezo Speaker
! GENERAL DESCRIPTION
The NJU8752 is an analog signal input monaural class D amplifier for Piezo speaker. The NJU8752 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 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 is suited for battery powered applications.
! PACKAGE OUTLINE
NJU8752V
! FEATURES
Piezo Speaker Driving 1-channel Analog Signal Input, 1-channel BTL Output Standby(Hi-Z), Mute Control Built-in Low Voltage Detector Built-in Short Protector Operating Voltage 2.7 ~ 3.6V (Input) 6.0 ~ 16.0V (Output) # C-MOS Technology # Package Outline SSOP14 # # # # # #
! PIN CONFIGURATION
VDD IN TEST 1 MUTE VSS OUT P VDDO 1 2 3 4 5 6 7 14 13 12 11 10 9 8 VSS COM TEST 2 STBY VSS OUT N VDDO
! BLOCK DIAGRAM
VDD VSS VDDO IN + COM +
Pulse Width Modulator
OUTP VSS VDDO OUTN VSS
Short Protector
Soft Start
Control
Logic
Low Voltage Detector
MUTE
TEST 1 STBY TEST 2
Ver.2003-05-29
-1-
NJU8752
! PIN DESCRIPTION
Function Power Supply: VDD=3.3V Signal Input Maker test 1 3 TEST 1 I This pin must be connected to GND. Mute Control 4 MUTE I Low : Mute ON High : Mute OFF 5, 10,14 VSS - Power GND: VSS=0V 6 OUTP O Positive Output 7, 8 VDDO - Output Power Supply : VDDO=16.0V max. 9 OUTN O Negative Output Standby Control 11 STBY I Low : Standby ON High : Standby OFF Maker test 2 12 TEST 2 I This pin must be connected to GND. 13 COM - Analog common *Pin No. 5(VSS),10(VSS) and 14(VSS) should be connected at a nearest point to the IC. *Pin No. 7(VDDO) and 8(VDDO) should be connected at a nearest point to the IC. *Pin No. 4(MUTE) and 11(STBY) must be connected to VDD, when these pins are not used. No. 1 2 SYMBOL VDD IN I/O - I
-2-
Ver.2003-05-29
NJU8752 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 STBY pin to "L", the standby mode is enabled. In the standby mode, the entire functions of the NJU8752 enter a low-power state, and the output pins (OUTP and OUTN) are high impedance. (3) Mute By setting the MUTE 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 against high short-circuit current, turns off the output driver. After about 5 seconds from the protection, the NJU8752 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.
Ver.2003-05-29
-3-
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