전자부품 데이터시트 검색엔진 |
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LA42032 데이터시트(PDF) 4 Page - Sanyo Semicon Device |
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LA42032 데이터시트(HTML) 4 Page - Sanyo Semicon Device |
4 / 7 page LA42032 No.A0855-4/7 External Components C1, C2 : Input coupling capacitors, for which 4.7 μF or less is recommended. LA42032 employs the zero-bias type input circuit, with the input pin potential being nearly zero. Accordingly, the polarity must be determined according to the DC potential of a circuit connected to the previous stage of LA42032. C3 : Capacitor for starting time of the ripple filter and amplifier, for which 47 μF is recommended. C4, R1 : Capacitor and resistor for mute. C4 is necessary even when the mute function is not used. C5 : Power capacitor. C6 to C9 : Capacitor and resistor for oscillation prevention. For C6 to C9, the polyester film capacitor with superior R2 to R5 temperature characteristics (Mylar capacitor) is recommended. Use R2 to R5 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 C4. Determine the constant after careful review because it is related to the pop sound at mute ON/OFF. C4 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-electrostatic diode, allowing the current to flow through the diode when the potential of VCC 7 pin decreases below that of pin 6. 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 VCC 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 C4 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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