전자부품 데이터시트 검색엔진 |
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LA42031-E 데이터시트(PDF) 4 Page - Sanyo Semicon Device |
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LA42031-E 데이터시트(HTML) 4 Page - Sanyo Semicon Device |
4 / 7 page LA42031 No.A0394-4/7 External Components C1 : The input coupling capacitors, for which 4.7 μF or less is recommended. LA42031 employs the zero-bias type input circuit, with the input pin potential being nearly zero (about 0.01V). Accordingly, the polarity must be determined according to the DC potential of a circuit connected to the previous stage of LA42031. C2 : Capacitor for starting time of the ripple filter and amplifier, for which 47 μF is recommended. C3, R1 : Capacitor and resistor for mute. C3 is necessary even when the mute function is not used. C4 : Power capacitor. C5, C6 : Capacitor and resistor for oscillation prevention. For C5, C6, the polyester film capacitor with superior R2, R3 temperature characteristics (Mylar capacitor) is recommended. Use R2, R3 of 2.2 Ω along with the capacitor. 1. Mute function (pin 6) With the pin 6 voltage of 1.7V (minimum) or more, the mute function is turned ON. Set the VM application voltage so that the pin 6 voltage becomes. 1.7V or more. The mute time constant is determined by R1 and C3. Determine the constant after careful review because it is related to the pop sound at mute ON/OFF. C3 is necessary even when the mute function is not used because it is related to the pop sound when the amplifier is turned ON. Note that the MUTE pin (pin 6) incorporates the anti-static diodo and that decrease of the VCC pin 7 potential below that of pin 6 causes the current to flow through the diode. 2. Standby function (pin 5) The amplifier is turned ON when the voltage of 2.5V (minimum) or more is applied to pin 5. Pin 5 control voltage Pin 5 voltage Amplifier Standby 0 to 0.5 OFF ON 2.5 to 15 ON OFF To suppress the inrush current to pin 5 when the VSTB application voltage is high, insert the control resistor (RSTB). Example : Tosuppress the pin 5 inrush current to 500 μA or less RSTB = Applied voltage (VSTB) -2VBE (About 1.4V) 500 μA -15k Ω Note that the standby pin (pin 5) incorporates the anti-electrostatic diode, allowing the cu orrent to flow through the diode when the potential of VCC pin 7 decreases below that of pin 5. Mute Standby + 6 C3 10 μF R1 2k Ω 2k Ω VCC VM 20k Ω 5 RSTB 1.5k Ω 15k Ω VCC 2VBE VS 30k Ω |
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