Using STK6303 300W power amplifier

STK6303 is a high-power thick-film integrated circuit from Sanyo . One circuit is divided into two sides, AB. It is still
very rare in China. Its internal circuit schematic diagram has not yet been found. It is estimated that it is specially used for some imported high-power frequency conversion speed regulation. Use motor
servo. Through repeated experiments, it was found that the B side (as
shown in Figure 3-52) is used as the current amplification of the subsequent power amplifier,
a fever op amp is used as an excitation, and then two models are
AA12480 with outputs of I)C36V and 4.2A. Imported
switching precision regulated power supply is used to create a fever amplifier with
excellent effect.
    The circuit is shown in Figure 3-53. This is an extremely
simple quasi-DC BTL300W integrated power amplifier. Among them,
ICla is a negative feedback volume control, and the gain is about
0 to 10 times adjustable. IClb is an inverter with a gain of l,
IC3 and IC4 are ST K6303F respectively, connected in quasi-DC
power amplifier mode, with a gain of about 15 times, and
matched with the above circuit, connected in BTL form, the output sensitivity
is about 150mV, and can be A 4fl load produces
an undistorted power output of approximately 300W , which is enough to drive any household
high-power speaker 6.
    This amplifier is easy to assemble and requires no debugging. The switching power supply has built-in overvoltage, overheating and overcurrent protection. 6 When assembling, pay attention to
the heat dissipation of the thick film circuit must be good. If possible, it is best to use an instrument fan for forced air cooling.