PDF IS31AP4088D Data sheet ( Hoja de datos )

Número de pieza	IS31AP4088D
Descripción	DUAL 2.6W STEREO AUDIO AMPLIFIER
Fabricantes	ISSI
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No Preview Available ! IS31AP4088D DUAL 2.6W STEREO AUDIO AMPLIFIER GENERAL DESCRIPTION The IS31AP4088D is a dual bridge-connected audio power amplifier which, when connected to a 5V supply, will deliver 2.6W to a 4Ω load. The IS31AP4088D features a low-power consumption shutdown mode and thermal shutdown protection. It also utilizes circuitry to reduce “clicks-and-pop” during device turn-on. APPLICATIONS  Cell phones, PDA, MP4,PMP  Portable and desktop computers  Desktops audio system  Multimedia monitors December 2011 KEY SPECIFICATIONS  PO at 1% THD+N, VDD = 5V RL = 4Ω ----------------------- 2.1W (Typ.) RL = 8Ω----------------------- 1.3W (Typ.)  PO at 10% THD+N, VDD = 5V RL = 4Ω ----------------------- 2.6W (Typ.) RL = 8Ω ----------------------- 1.6W (Typ.)  PO at 1% THD+N, VDD = 4V RL = 4Ω ----------------------- 1.4W (Typ.) RL = 8Ω ----------------------- 0.81W (Typ.)  Shutdown current ----------------------- 0.04μA (Typ.)  Supply voltage range -------------------- 2.7V ~ 5.5V  QFN-16 (4mm × 4mm) package FEATURES  Suppress “click-and-pop”  Thermal shutdown protection circuitry  Micro power shutdown mode TYPICAL APPLICATION CIRCUIT INA BNC C1 0.22uF R1 20K INB BNC C2 0.22uF R3 20K 4 INA VCC C3 R2 20K http://www.DataSheet4U.net/ 1uF 2,11 VDD - + VCC SHUTDOWN WORKING 15 SHUTDOWN -OUTA 3 9 BYPASS C4 1uF +OUTA 1 - + + - +OUTB 12 8 INB + - GND 5,6,7,13,14,16 -OUTB 10 R4 20K Figure 1 Typical Audio Amplifier Application Circuit Integrated Silicon Solution, Inc. – www.issi.com Rev.A, 11/29/2011 1 datasheet pdf - http://www.DataSheet4U.net/ 1 page IS31AP4088D ELECTRICAL CHARACTERISTICS The following specifications apply for VDD = 3V, unless otherwise noted. Limits apply for TA = 25°C. Symbol Parameter Condition Typ. Limit IDD Quiescent current power supply VIN = 0V, IO = 0A 3.8 ISD Shutdown current GND applied to the shutdown pin 0.1 VIH Shutdown input voltage high VIL Shutdown input voltage low TWU Turn on time 1μF bypass cap(C4) 110 1.1 0.4 Unit mA μA V (Min.) V (Max.) ms ELECTRICAL CHARACTERISTICS OPERATION The following specifications apply for VDD = 3V, unless otherwise noted. Limits apply for TA = 25°C. Symbol Parameter Condition Typ. Limit Vos Po THD+N PSRR Xtalk VNO Output offset voltage Output power Total harmonic distortion+noise Power supply rejection ratio Channel separation Output noise voltage VIN=0V THD+N = 1%, f = 1kHz, RL= 8Ω THD+N = 10%, f = 1kHz, RL = 8Ω THD+N = 1%, f = 1kHz, RL = 4Ω THD+N = 10%, f = 1kHz, RL = 4Ω 1kHz, Avd = 2, RL = 8Ω, Po = 0.3W Input floating, 217Hz, Vripple = 200mVp-p C4 = 1μF, RL = 8Ω Input floating 1kHz, Vripple = 200mVp-p C4 = 1μF, RL = 8Ω http://www.DataSheet4U.net/ Input GND 217Hz, Vripple = 200mVp-p C4 = 1μF, RL =8Ω Input GND 1kHz Vripple = 200mVp-p C4 = 1μF, RL = 8Ω f = 1kHz, C4 = 1μF 1kHz, A-weighted 2.5 0.45 0.56 0.74 0.9 0.18 75 70 60 62 -100 7 Unit mV W W W W % dB dB dB dB dB μV Integrated Silicon Solution, Inc. – www.issi.com Rev.A, 11/29/2011 5 datasheet pdf - http://www.DataSheet4U.net/ 5 Page IS31AP4088D increased ambient temperatures. The above examples assume that a device is a surface mount part operating around the maximum power dissipation point. Since internal power dissipation is a function of output power, higher ambient temperatures are allowed as output power or duty cycle decreases. If the result of Equation (2) is greater than that of Equation (3), then decrease the supply voltage, increase the load impedance, or reduce the ambient temperature. If these measures are insufficient, a heat sink can be added to reduce θJA. The heat sink can be created using additional copper area around the package, with connections to the ground pin(s), supply pin and amplifier output pins. The θJA is the sum of θJC, θCS, and θSA. (θJC is the junction-to-case thermal impedance, θCS is the case-to-sink thermal impedance, and θSA is the sink-to-ambient thermal impedance.) POWER SUPPLY BYPASSING As with any power amplifier, proper supply bypassing is critical for low noise performance and high power supply rejection. Applications that employ a 5V regulator typically use a 10μF in parallel with a 0.1μF filter capacitor to stabilize the regulator’s output, reduce noise on the supply line, and improve the supply’s transient response. However, their presence does not eliminate the need for a local 1.0μF tantalum bypass capacitance connected between the IS31AP4088D’s supply pins and ground. Keep the length of leads and traces that connect capacitors between the IS31AP4088D’s power supply pin and ground as short as possible. MICRO-POWER SHUTDOWN The voltage applied to the SHUTDOWN pin controls the IS31AP4088D’s shutdown function. Activate micro-power shutdown by applying GND to the SHUTDOWN pin. When active, the IS31AP4088D’s micro-power shutdown feature turns off the amplifier’s bias circuitry, reducing the supply current. The low 0.04μA typical shutdown current is achieved by applying a voltage that is as near as GND as possible to the SHUTDOWN pin. There are a few ways to control the micro-power shutdown. These include using a single-pole, single-throw switch, a microprocessor, or a microcontroller. When use a switch, connect an external 100kΩ resistor between the SHUTDOWN pin and GND. Select normal amplifier operation by closing the switch. Opening the switch sets the SHUTDOWN pin to ground through the 100kΩ resistor, which activates the micro power shutdown. The switch and resistor guarantee that the SHUTDOWN pin will not float. This prevents unwanted state changes. In a system with a microprocessor or a microcontroller, use a digital output to apply the control voltage to the SHUTDOWN pin. Driving the SHUTDOWN pin with active circuitry eliminates the pull up resistor. Integrated Silicon Solution, Inc. – www.issi.com Rev.A, 11/29/2011 SELECTING PROPER EXTERNAL COMPONENTS Optimizing the IS31AP4088D’s performance requires properly selecting external components. Though the IS31AP4088D operates well when using external components with wide tolerances, best performance is achieved by optimizing component values. The IS31AP4088D is unity-gain stable, giving a designer maximum design flexibility. The gain should be set to no more than a given application requires. This allows the amplifier to achieve minimum THD+N and maximum signal-to-noise ratio. These parameters are compromised as the closed-loop gain increases. However, low gain demands input signals with greater voltage swings to achieve maximum output power. Fortunately, many signal sources such as audio CODECs have outputs of 1VRMS (2.83VP-P). Please refer to the Audio Power Amplifier Design section for more information on selecting the proper gain. INPUT CAPACITOR VALUE SELECTION Amplifying the lowest audio frequencies requires high value input coupling capacitors (C1 and C2) in Figure 2. A high value capacitor can be expensive and may compromise space efficiency in portable designs. In many cases, however, the speakers used in portable systems, whether internal or external, have little ability to reproduce signals below 150 Hz. Applications using speakers with this limited frequency response reap little improvement by using large input capacitor. Besides effecting system cost and size, C1 and C2 have an effect on the IS31AP4088D’s click and pophttp://www.DataSheet4U.net/ performance. When the supply voltage is first applied, a transient (pop) is created as the charge on the input capacitor changes from zero to a quiescent state. The magnitude of the pop is directly proportional to the input capacitor’s size. Higher value capacitors need more time to reach a quiescent DC voltage (usually VDD/2) when charged with a fixed current. The amplifier’s output charges the input capacitor through the feedback resistors, R2 and R4. Thus, pops can be minimized by selecting an input capacitor value that is no higher than necessary to meet the desired −3dB frequency. A shown in Figure 2, the input resistors (R1 and R3) and the input capacitors (C1 and C2) produce a −3dB high pass filter cutoff frequency that is found using Equation (7). f-3dB= 1/2πRinCin= 1/2π R1C1 (7) As an example when using a speaker with a low frequency limit of 150Hz, C1, using Equation (7) is 0.053μF. The 0.33μF C1 shown in Figure 2 allows the IS31AP4088D to drive high efficiency, full range speaker whose response extends below 30Hz. 11 datasheet pdf - http://www.DataSheet4U.net/ 11 Page

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