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IS31AP2110 Datasheet(PDF) 11 Page - Integrated Silicon Solution, Inc |
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IS31AP2110 Datasheet(HTML) 11 Page - Integrated Silicon Solution, Inc |
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11 / 16 page  IS31AP2110 Integrated Silicon Solution, Inc. – www.issi.com 11 Rev. A, 09/01/2014 APPLICATIONS INFORMATION GAIN SETTINGS The gain of the IS31AP2110 is set by two input pins, GAIN0 and GAIN1. By varying input resistance in IS31AP2110, the various volume gains are achieved. The respective volume gain and input resistance are listed in Table 1. However, there is 20% variation in input resistance from production variation. Table 1 Volume gain and input impedance GAIN1 GAIN0 Volume Gain (dB) Input Resistance, RIN (kΩ) 0 0 20 60 0 1 26 30 1 0 32 15 1 1 36 9 SHUTDOWN (SDB) CONTROL Pulling SDB pin low will let IS31AP2110 operate in low-current state for power conservation. The IS31AP2110 outputs will enter mute once SDB pin is pulled low, and regulator will also disable to save power. If let SDB pin floating, the chip will enter shutdown mode because of the internal pull low resistor. For the best power-off performance, place the chip in the shutdown mode in advance of removing the power supply. DC DETECTION IS31AP2110 has dc detection circuit to protect the speakers from DC current which might be occurred as input capacitor defect or inputs short on printed circuit board. The detection circuit detects first volume amplifier stage output, when both differential outputs’ voltage become higher than a determined voltage or lower than a determined voltage for more than 420ms, the dc detect error will occur and report to FAULTB pin. At the same time, loudspeaker drivers of right/left channel will disable and enter Hi- Z. This fault can’t be cleared by cycling SDB, it is necessary to cycle the VCC supply. The minimum differential input voltages required to trigger the DC detect function are shown in table2. The input voltage must keep above the voltage listed in the table for more than 420msec to trigger the DC detect fault. The equivalent class-D output duty of the DC detect threshold is listed in table3. For 8V supply, DC detect fault will occur as output duty exceed 13% for more than 420msec. Table 2 DC Detect Threshold AV (dB) VIN (mV, differential) 20 104 26 52 32 26 36 16 Table 3 Output DC Detect Duty (for Either Channel) VCC (V) Output Duty Exceeds 8 13% 12 8.7% 16 6.5% 24 4.3% THERMAL PROTECTION If the internal junction temperature is higher than 170 oC, the outputs of loudspeaker drivers will be disabled and at low state. The temperature for IS31AP2110 returning to normal operation is about 150 oC. The variation of protected temperature is about 10%. Thermal protection faults are not reported on the FAULTB pin. SHORT-CIRCUIT PROTECTION To protect loudspeaker drivers from over-current damage, IS31AP2110 has built-in short-circuit protection circuit. When the wires connected to loudspeakers are shorted to each other or shorted to GND or to VCC, overload detectors may activate. Once one of right and left channel overload detectors are active, the amplifier outputs will enter a Hi-Z state and the protection latch is engaged. The short protection fault is reported on FAULTB pin as a low state. The latch can be cleared by reset SDB or power supply cycling. The short circuit protection latch can have auto- recovery function by connect the FAULTB pin directly to SDB pin. The latch state will be released after 420ms, and the short protection latch will re- cycle if output overload is detected again. UNDER-VOLTAGE DETECTION When the AVDD voltage is lower than 2.7V or the VCC voltage is lower than 7.5V, loudspeaker drivers of right/left channel will be disabled and kept at low state. Otherwise, IS31AP2110 return to normal operation. |
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