PDF IS31AP2145A Data sheet ( Hoja de datos )

Número de pieza	IS31AP2145A
Descripción	MONO CLIP-LESS & FILTER-LESS CLASS-D
Fabricantes	ISSI
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No Preview Available ! IS31AP2145A [email protected] MONO CLIP-LESS & FILTER-LESS CLASS-D AUDIO POWER AMPLIFIER December 2011 GENERAL DESCRIPTION FEATURES The IS31AP2145A is a [email protected] mono, clip-less, filter-less, high efficiency Class-D audio power amplifier with automatic gain control. The IS31AP2145A integrates AGC (Automatic Gain Control) function to automatically prevent distortion of the audio signal by which we can enhance audio quality and also protect the speaker from damage at high power levels. The AGC function and its attack time/release time are selectable via the CTRL pin. The IS31AP2145A also provides thermal and over current protection functions. In addition to these features, 90% high efficiency, improved RF-rectification immunity, a fast start-up time and small package size make IS31AP2145A ideal choice for cellular handsets, PDAs and other portable applications. IS31AP2145A is available in a 1.5mm×1.5mm UTQFN-9 package.  Filter-less Class-D architecture  AGC enable/disable function  2.9W into 4Ω at 5.0V (10% THD+N)  Power supply range: 2.7V to 5.5V  Selectable attack and release times  Minimum external components  High efficiency: 90%  Click-and-pop suppression  Low shutdown current: 0.1μA  Short-circuit and thermal protection  Space-saving UTQFN-9, 1.5mm × 1.5mm APPLICATIONS  Wireless or cellular handsets and PDAs  Portable navigation devices  Portable DVD player  Notebook PC  Educational toys  USB speakers  Portable gaming TYPICAL APPLICATION CIRCUIT http://www.DataSheet4U.net/ VBattery 1F A2 VDD 0.1 F B2 VREF 1F Differential In CTRL1 CTRL2 R1 R2 R3 CIN 33nF A1 A3 OUT+ IN+ C1 IS31AP2145A IN- CIN 33nF C3 OUT- C2 CTRL 0.1 F B1,B3 GND Figure 1 Typical Application Circuit (Differential Input) Integrated Silicon Solution, Inc. – www.issi.com Rev.A, 11/20/2011 1 datasheet pdf - http://www.DataSheet4U.net/ 1 page IS31AP2145A ABSOLUTE MAXIMUM RATINGS (NOTE 1) Supply voltage, VDD Voltage at any input pin Junction temperature, TJMAX Storage temperature range, TSTG Operating temperature range ESD (HBM) -0.3V ~ +6.0V -0.3V ~ VDD+0.3V 150°C -65°C ~ +150°C −40°C ~ +85°C 7kV Note: Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other condition beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS TA = -40°C ~ +85°C, VDD = 2.7V ~ 5.5V, unless otherwise noted. Typical value are VDD = 3.6V, TA = +25°C. Symbol Parameter Condition Min. Typ. Max. Unit VDD IDD ISD fSW Gain Supply voltage Quiescent current Shutdown current Switching frequency Audio input gain VCTRL = 0V VDD = 2.7V ~ 5.5V 2.7 5.5 V 2 mA 0.1 μA 300 kHz 18 dB AGC Characteristics VAGC1 VAGC2 VOFF VSD tAT1 tRT1 tAT2 tRT2 AMAX AGC1 mode setting threshold voltage AGC2 mode setting threshold voltage AGC OFF mode setting threshold voltage Shutdown mode setting threshold voltage Attack time 1 Release time 1 Attack time 2 Release time Maximum attenuation gain http://www.DataSheet4U.net/ 1.4 0.64 VDD 1.05 V V 0.36 0.6 V 0 0.14 V 45 ms 2.6 s 10 ms 1.2 s -10 dB Integrated Silicon Solution, Inc. – www.issi.com Rev.A, 11/20/2011 5 datasheet pdf - http://www.DataSheet4U.net/ 5 Page IS31AP2145A http://www.DataSheet4U.net/ Figure 20 System Timing INPUT CAPACITORS (CIN) The input capacitors (CIN) and internal resistor (RIN = 28.5kΩ) form a high-pass filter with the corner frequency, fC, determined in Equation (1). 1 fc  2RIN C IN For example, in figure 1, (1) CIN = 33nF, RIN = 28.5kΩ, So, fc  2 1  28.5k  33nF  169 Hz The capacitors should have a tolerance of  10% or better, because any mismatch in capacitance causes an impedance mismatch at the corner frequency and below. DECOUPLING CAPACITOR (CS) The IS31AP2145A is a high performance class-D audio amplifier that requires adequate power supply decoupling to ensure the efficiency is high and total harmonic distortion (THD) is low. For higher frequency transients, spikes, or digital hash on the line, a good low equivalent-series-resistance (ESR) ceramic capacitor, typically 0.1μF, placed as close as possible to the device VDD lead works best. Placing this decoupling capacitor close to the IS31AP2145A is very important for the efficiency of the class-D amplifier, because any resistance or inductance in the trace between the device and the capacitor can cause a loss in efficiency. For filtering lower frequency noise signals, a 1μF or greater capacitor placed near the audio power amplifier would also help. Integrated Silicon Solution, Inc. – www.issi.com Rev.A, 11/20/2011 11 datasheet pdf - http://www.DataSheet4U.net/ 11 Page

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