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LV4991TT - Monaural BTL Power Amplifier

Description

Pin voltage Pin No.

Standby mode at 0 to 0.3V Operation mode at 1.9 to VCC VCC 2 21kΩ 121.4kΩ 40.7kΩ GND 3 VREF 1.81 Ripple filter pin (For connection of capacitor for

Features

  • as above described. 3. Pin 4 control (second amplifier stop control function) Pin 4 is a pin to turn ON/OFF the operation of second amplifier. By using this function, the pop sound at startup can be reduced. Note that pin 4 can be controlled by applying the voltage described below : Second amplifier ON ⇒ V4 = 1.6 to VCCV or OPEN Second amplifier OFF ⇒ V4 = 0 to 0.3V When the pin-3 capacitor C4 is downsized, the pop sound becomes louder. The pop sound can be reduced by providing the time Tmu to s.

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Full PDF Text Transcription

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www.DataSheet.co.kr Ordering number : ENA0739D Bi-CMOS IC LV4991TT Overview For Portable Audio Equipment Monaural BTL Power Amplifier LV4991TT incorporates the power amplifier circuit operable at low voltage (2.7V or more) and has additionally the standby function to reduce the current drain. This is the best LSI for speaker drive for the battery-driven portable equipment, such as IC recorders, portable radios, etc. The LV4991TT is a MSOP8 (150mil) package, and The LV4991TH of HMSOP8 (150mil) package is available. Function and Feature • Monaural BTL power amplifier incorporated Standard output power = 450mW (VCC = 3.6V, RL = 8Ω, THD = 10%) Output coupling capacitor not necessary because of differential output type • Operation at low voltage possible VCC = 2.
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