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LA4725 数据表(PDF) 4 Page - Sanyo Semicon Device |
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LA4725 数据表(HTML) 4 Page - Sanyo Semicon Device |
4 / 8 page LA4725 No.6631-4/8 Pin Voltages VCC = 13.2V, with 5V applied to STBY through a 10kΩ resistor, RL = 4Ω, Rg = 0 Pin No. 1 2 3 4 5 6 7 Pin name IN1 DC PRE-GND STBY ON TIME IN2 POP Pin voltage 1.53V 5.65V 0V 3.25V 2.32V 1.53V 2.14V Pin No. 8 9 10 11 12 13 14 Pin name +OUT2 −OUT2 PWR-GN +OUT1 PWR-GN −OUT1 VCC Pin voltage 5.70V 5.70V 0V 5.70V 0V 5.70V 13.2V External Components C1 and C4: Input capacitors. A value of 2.2 µF is recommended. Determine the polarity based on the DC potential of the circuit connected directly to the LA4725 front end. Note that the low band response can be adjusted by varying fL with the capacitors C1 and C4. C2 : Decoupling capacitor (ripple filter) C3 : Sets the amplifier starting time, which will be approximately 0.6 seconds for a value of 33 µF. The starting time is proportional to the value of this capacitor, and can be set to any desired value. C5 : Power-supply capacitor C6, C7, C8, and C9 : Oscillation prevention capacitors. Use polyester film capacitors (Mylar capacitors) with excellent characteristics. (Note that the series resistors R2, R3, R4, and R5 are used in conjunction with these capacitors to achieve stable amplifier operation.) A value of 0.1 µF is recommended. C10 : Impulse noise reduction capacitor. A value of 0.47 µF is recommended. Caution is required when selecting the value for this capacitor, since increasing its value influences the operation of the circuits that protect against shorting the amplifier output pins to VCC or to ground when higher VCC voltages (approximately 16V or higher) are used. R1 : Standby switch current limiting resistor. A value of 10k Ω is recommended when a voltage in the range 2.5 to 12V will be applied as the standby switching voltage. Note that this resistor is not optional: it must be included. IC Internal Characteristics and Notes 1. Standby function • Pin 4 is the standby switch. A voltage of 2.5V or higher must be applied through an external resistor to turn the amplifier on. • If a voltage of over 12V will be applied as the standby mode switching voltage, use the following formula to determine the value of R1 so that the current entering at pin 4 remains under 500 µA. <applied voltage> − 1.4 R1 = 500 µA − 10kΩ 2. Muting function • Pin 5 connects the capacitor that determines the starting time to prevent impulse noise. It can also be used to mute the amplifier output by shorting pin 5 to ground. When this function is used, the recovery time depends on C3. 3. Impulse noise improvements • While the LA4725 achieves a low level of impulse noise, if even further reductions in impulse noise at power on/off (and when switching into or out of standby mode) a 0.47 µF capacitor may be inserted between pin 7 and the PRE GND pin (pin 3). (Pin 7 is the output amplifier bias pin. Since the ability to withstand shorting the output pins to VCC or ground is reduced for supply voltages over 16V if the pin 7 capacitance is large, we recommend a value of 0.47 µF or lower for this capacitor.) 4 R1 10k Ω 500µA or lower About 1.4V (2VBE) Pin 4 Internal Equivalent Circuit Applied standby voltage |
类似零件编号 - LA4725_09 |
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类似说明 - LA4725_09 |
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