la4450 Sanyo Semiconductor Corporation, la4450 Datasheet - Page 3

• Manufacturer Part Number: la4450
• Description: Two Channel Power Ic For Bus Or Track Use In Tv And Home Audio Applications
• Manufacturer: Sanyo Semiconductor Corporation

Test Circuit
1. Features and Usage Notes
• Pin 12 is the standby pin. The IC operates when a voltage of 2 V or higher is applied through the external resistor
• Changing the voltage gain
• The LA4450 includes a thermal protection circuit to prevent damage to or destruction of the IC due to abnormal
• The LA4450 includes an overvoltage protection circuit to protect the IC against power supply surges and abnormal
• Although the LA4450 includes a current limiter circuit to prevent damage due to abnormal currents, care must still
R1. Note that the maximum influx current to pin 12 is 500 µA.
The voltage gain VG can be lowered by connecting an external resistor in series between the NF pin (pins 8 and
14) and C
VG = 20 log
However, since the IC may oscillate if VG is 30 dB or lower, use a VG of 36 dB or higher.
overheating. As a result, the output may be attenuated or cut off if the application heat sinking is inadequate.
voltages. This circuit has hysteresis characteristics: it operates at between 39 and 40 V, and recovers at around 34 V.
be exercised to prevent load shorts and other excessive current conditions.
NF
.
75 + R
30 kΩ
Nf’
LA4450
Unit (resistance : Ω, capacitance : F)
No. 4090-3/7