AP500 and its application circuit ab


Posted on Mar 28, 2007

AP500 is a high-performance dual-channel FET DC amplifier driver module. It uses a high operating voltage. Push power, low distortion, wide frequency response, simple external


AP500 and its application circuit ab
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circuit, using the superior has unparalleled in the audio circuit resistance. AP500 can promote a greater power output, and the performance is very good, the circuit can easily use the system to make high-power amplifier circuit. AP500 internal structure of the pure DC output zero potential fairly stable, the operating voltage of 14 ~ 60V range, output zero drift is less than 90mV. Its output has the protection circuit, even if it SPIDERS tube amplifier module will not be damaged when short circuit. AP500 has an excellent low frequency performance, the DC amplifier gain is still up to 27dB, so excellent low-frequency characteristics of the amplifier circuit to improve the transient index, lower distortion has great significance. The electrical path limit operating voltage of 75V, not only provide a large output signal voltage, but also improve the dynamic characteristics of the circuit resistance. Since in-circuit DC structure, its input and output can be in the form of direct coupling. Application of the amplifier circuit in, AP500 can create OTLOCL, two, BTL, class AB, super CPI, CPI and other characteristics of the power amplifying circuit. Due to the low power consumption of the module, use the heat sink is not required. Internal module also has an automatic zero word and distortion correction circuit distortion 0. 02%, conversion rates up to 70V/r./S, the closed-loop frequency response of 0 ~ work 500kHzo AP 500 module uses the single-line l 5 feet packaging, shape and pin arrangement shown in Figure 2-128 (a) the pin functions shown o be able to: 1 foot to the negative power supply; 23 feet for the static bias adjustment ends L channel; 4,5 L-sound Road discretionary signal output terminal; 6 feet for the negative feedback terminal L channel; 7 feet for the L-channel signal input; 8 feet for the ground; 9 feet for the letter R channel input terminal; 10 feet for the R sound was negative feedback terminal; 1 1,12 feet for R channel signal output terminal; 13,1 R 4 feet for sound channel static bias adjustment ends; 15 pin connected to the positive supply. Figure 2-12,8 (b) is its application circuit. This circuit uses a direct drive AP500 composite tube made of complementary symmetry push -pull output, 28V supply voltage, maximum output power up 90Wo improve voltage and high-power output tube, the maximum output power up to 200W. Circuit can work without debugging. If the quiescent current of the power amplifier tube required, could in AP500 2,3 foot (the other channel 13-14 feet) indirect human variable resistor to adjust the setting of the static power amplifier tube current state, under normal circumstances the output pipe quiescent current of about 40mA can be adjusted to play good working condition o




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