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LA4708N 数据表(PDF) 5 Page - ON Semiconductor |
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LA4708N 数据表(HTML) 5 Page - ON Semiconductor |
5 / 9 page LA4708N No. A1783-5/9 Features of IC Inside and Usage Notes Standby function Pin 5 is the standby switch pin. The amplifier is turned on by applying approximately 2.5V or more to this pin through an external resistor (R1). If voltage in excess of 13.2V is to be applied to the standby switch, calculate the value of R1 using the following formula so that the current flowing into pin 5 is 500 A or less: R1 = 10k Mute function Pin 6 is the connector for the capacitor that determines the on time in order to prevent pop noise. By grounding this pin, the amplifier can implement mute operation. In this case, the recovery time depends on C3. How to reduce pop noise Although the LA4708N reduces pop noise, an electrolytic capacitor of between 0.47 and 2.2F can be connected between pin 8 and the pre-GND to further reduce pop noise that occurs when power supply is turned on/off (standby switch on/off). The larger the capacitance, the lower the frequency of pop noise, and it is barely audible, but sound residue of the sound signal is liable to linger when power is turned off. Pin 8 is the bias pin for the output amplifier and normally is left open. Protectors In an output-to-ground and output-to-VCC short protector system configuration, if a DC resistor is connected between amplifier output pin and GND, the protector may operate, causing the amplifier not to start operating. Therefore, as a general rule, no DC resistor should be connected between amplifier output pin and GND. In order to prevent damage or degradation which may be caused by abnormally heated IC, the LA4708N has a thermal shutdown protector. Accordingly, if the IC junction temperature (Tj) climbs to around 170 to 180 C due to inadequate heat dissipation, the thermal shutdown protector will operate to control the output gradually into attenuation. Also be fully careful of handling other protectors built in the LA4708N. Miscellaneous Since pins 1 and 9, which are unused, are connected internally, they must be left open. Pin 10 is an NC pin (no internal connection). Applied voltage 1.4V 500 A |
类似零件编号 - LA4708N |
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类似说明 - LA4708N |
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