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IS31AP2036A Datasheet(PDF) 11 Page - Integrated Silicon Solution, Inc |
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IS31AP2036A Datasheet(HTML) 11 Page - Integrated Silicon Solution, Inc |
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11 / 17 page  IS31AP2036A Integrated Silicon Solution, Inc. – www.issi.com Rev. B, 03/29/2016 11 APPLICATION INFORMATION The IS31AP2036A is a Class-K audio power amplifier with high efficiency and automatic gain control. It drives up to 2.0W (10% THD+N) into an 8Ω speaker from a 4.2V VCC supply. The IS31AP2036A integrates advanced high efficiency charge pump and whole power amplifier efficiency can be up to 75%. The output power will be maintained in 0.8W, 1.0W and 1.2W. The IS31AP2036A provides low cost, space saving solution for portable equipments which need audio output with higher power by boosting up supply voltage. Its external components just include a few capacitors and resistors (no inductor). CONSTANT OUTPUT POWER The output power will fall down by the drop of supply voltage and decrease audio volume. IS31AP2036A provides advanced AGC function to maintain the output power stable within 3.3V~4.35V supply voltage. Even voltage of battery falls down in mobile application; IS31AP2036A can still provide high-quality audio. There are four operation modes for IS31AP2036A and three of these have AGC function with output power as 1.2W, 1W and 0.8W. AGC Function This is the function to control the output in order to obtain a maximum output level without distortion when an excessive input is applied which would otherwise cause clipping at the differential signal output. That is, with the traditional AGC function, lowers the gain of the digital amplifier to an appropriate value so as not to cause clipping at the differential signal output (Figure 21). Figure 21 AGC Function IS31AP2036A adopts advanced AGC function which maintains constant output power without signal distortion when the supply voltage falling down (Figure 22, 23). Figure 22 Traditional AGC Function Figure 23 IS31AP2036A Advanced AGC Function Attack and Release Time The attack time is a time interval that gains falls down with a big signal input enough. And the release time is a time from target attenuation to no AGC attenuation. Attack Time Release Time Figure 24 Attack and Release Time K-CHARGEPUMP IS31AP2036A adopts advanced K-CHARGEPUMP techniques, which increases high efficiency and drive power with 750kHz operation frequency and integrates soft-start, over current and over voltage control circuit to guarantee stable operation. Soft-Start To limit inrush current in charge pump start procedure, the K-CHARGEPUMP adopts soft-start function. The soft-start time is 0.7ms and limits the supply current within 350mA. Over Voltage Protection K-CHARGEPUMP output voltage, PVCC is VCC of 1.5 times to provide high voltage for internal power amplifier. K-CHARGEPUMP integrates over voltage protection function. PVCC is not times VCC when supply voltage is over 3.8V. The OVP circuit will keep PVCC in 5.8V (Typ.). VCC VCC No AGC, output has distortion AGC, output has no distortion No AGC, VCC falls down, output has distortion AGC, output has no distortion VCC Traditional AGC, VCC falls down, output signal has no distortion, but output power decreases Constant output power Advanced AGC, output signal has no distortion, output power keeps constant VCC |
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