IS31AP2145B [email protected] MONO CLIP-LESS & FILTER-LESS CLASS-D AUDIO POWER AMPLIFIER Preliminary Information May 2012 GENERAL DESCRIPTION FEATURES The IS31AP2145B is a [email protected] mono, clip-less, filter-less, high efficiency Class-D audio power amplifier with automatic gain control. The IS31AP2145B 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 IS31AP2145B 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 IS31AP2145B ideal choice for cellular handsets, PDAs and other portable applications. IS31AP2145B is available in a 1.5mm×1.5mm UTQFN-9 package. Filter-less Class-D architecture AGC enable/disable function 2.7W 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 Figure 1 Typical Application Circuit (Differential Input) Integrated Silicon Solution, Inc. – www.issi.com Rev.0A, 05/14/2012 1 IS31AP2145B VBattery A2 VCC VREF B2 1 F 1 F 0.1 F CIN 33nF A1 Single-ended In C1 IN+ IN- OUTC2 R1 CTRL R2 CTRL2 0.1 F A3 IS31AP2145B CIN 33nF CTRL1 OUT+ GND C3 B1,B3 R3 Figure 2 Typical Application Circuit (Single-Ended Input) Integrated Silicon Solution, Inc. – www.issi.com Rev.0A, 05/14/2012 2 IS31AP2145B PIN CONFIGURATION Package Pin Configuration (Top View) UTQFN-9 PIN DESCRIPTION No. Pin Description A1 IN+ Positive input terminal. A2 VCC Power supply. A3 OUT+ Positive output terminal. B1, B3 GND Ground. B2 VREF Analog reference power supply terminal. C1 IN- Negative input terminal. C2 CTRL Power down and AGC control terminal. C3 OUT- Negative output terminal. Copyright © 2012 Integrated Silicon Solution, Inc. All rights reserved. ISSI reserves the right to make changes to this specification and its products at any time without notice. ISSI assumes no liability arising out of the application or use of any information, products or services described herein. Customers are advised to obtain the latest version of this device specification before relying on any published information and before placing orders for products. Integrated Silicon Solution, Inc. does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness. Products are not authorized for use in such applications unless Integrated Silicon Solution, Inc. receives written assurance to its satisfaction, that: a.) the risk of injury or damage has been minimized; b.) the user assume all such risks; and c.) potential liability of Integrated Silicon Solution, Inc is adequately protected under the circumstances Integrated Silicon Solution, Inc. – www.issi.com Rev.0A, 05/14/2012 3 IS31AP2145B ORDERING INFORMATION Industrial Range: -40°C to +85°C Order Part No. Package QTY/Reel IS31AP2145B-UTLS2-TR UTQFN-9, Lead-free 3000 Integrated Silicon Solution, Inc. – www.issi.com Rev.0A, 05/14/2012 4 IS31AP2145B ABSOLUTE MAXIMUM RATINGS (NOTE 1) Supply voltage, VCC Voltage at any input pin Maximum junction temperature, TJMAX Storage temperature range, TSTG Operating temperature range, TA -0.3V ~ +6.0V -0.3V ~ VCC+0.3V 150°C -65°C ~ +150°C −40°C ~ +85°C 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, VCC = 2.7V ~ 5.5V, unless otherwise noted. Typical value are VCC = 3.6V, TA = +25°C. Symbol Parameter VCC Supply voltage ICC Quiescent current ISD Shutdown current fSW Switching frequency Gain Condition Min. Typ. 2.7 Max. Unit 5.5 V 2 mA VCTRL = 0V 0.1 μA VCC = 2.7V ~ 5.5V 300 kHz 18 dB Audio input gain AGC Characteristics VAGC1 AGC1 mode setting threshold voltage 1.4 VCC V VAGC2 AGC2 mode setting threshold voltage 0.8 1.05 V VOFF AGC OFF mode setting threshold voltage 0.36 0.6 V VSD Shutdown mode setting threshold voltage 0 0.14 V tAT1 Attack time 1 45 ms tRT1 Release time 1 2.6 s tAT2 Attack time 2 10 ms tRT2 Release time 1.2 s AMAX Maximum attenuation gain -10 dB Integrated Silicon Solution, Inc. – www.issi.com Rev.0A, 05/14/2012 5 IS31AP2145B ELECTRICAL CHARACTERISTICS AGC off, TA = +25°C, VCC = 3.6V, unless otherwise noted. Symbol PO Parameter Output power Condition Min. Typ. Max. Unit THD+N = 10%，f = 1kHz RL = 4Ω+33µH VCC = 5.0V 2.7 W THD+N = 1%，f = 1kHz RL = 4Ω+33µH VCC = 5.0V 2.0 W THD+N = 10%，f = 1kHz RL =8Ω +33µH VCC = 5.0V 1.63 W THD+N = 1%，f = 1kHz RL = 8Ω+33µH VCC = 5.0V 1.30 W VCC = 3.6V, PO = 0.5W, RL = 8Ω+33µH f = 1kHz 0.2 VCC = 3.6V, PO = 1.0W, RL = 4Ω+33µH f = 1kHz 0.5 Power supply rejection ratio VP-P = 200mV，RL = 8Ω，f = 217Hz -67 dB VP-P = 200mV，RL = 8Ω，f = 1kHz -63 dB η Maximum efficiency PO = 1.0W，RL = 8Ω+33µH，f = 1kHz 90 % tST Start-up time 34 ms tWK Wake-up time 40 ms tSD Shutdown time 80 ms Mode switching time 0.1 ms THD+N PSRR tMOD Total harmonic distortion plus noise Integrated Silicon Solution, Inc. – www.issi.com Rev.0A, 05/14/2012 % 6 IS31AP2145B TYPICAL PERFORMANCE CHARACTERISTICS 20 20 RL = 8Ω+33µH f = 1kHz 10 5 THD+N(%) 5 THD+N(%) RL = 4Ω+33µH f = 1kHz 10 VCC = 3.6V 2 1 VCC = 4.2V 0.5 VCC = 3.6V 2 1 VCC = 4.2V 0.5 0.2 0.2 VCC = 5.0V 0.1 10m 20m 50m 100m 200m 500m 1 2 0.1 10m 3 VCC = 5.0V 20m 50m Output Power(W) VCC = 3.6V PO = 500mW RL = 8Ω+33µH 3 4 5 2 1 0.2 2 1 0.2 0.1 0.1 0.05 0.05 0.02 0.02 20 50 VCC = 3.6V PO = 0.9W RL = 4Ω+33µH 10 THD+N(%) THD+N(%) 5 100 200 500 1k 2k 5k 0.01 10k 20k 20 50 100 200 Frequency(H z) Figure 5 500 1k 2k 5k 10k 20k Frequency(Hz) THD+N vs. Frequency Figure 6 100 100 90 90 80 80 70 70 Efficiency(%） Efficiency(%） 2 20 10 60 50 40 30 THD+N vs. Frequency 60 50 40 30 20 20 VCC = 3.6V~5.0V RL = 8Ω+33μH 10 0 1 THD+N vs. Output Power Figure 4 20 0.01 500m Output Power(W) THD+N vs. Output Power Figure 3 100m 200m 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 VCC = 3.6V~5.0V RL = 4Ω+33μH 10 1.8 0 0 0.4 0.8 Output Power(W) Figure 7 Efficiency vs. Output Power Integrated Silicon Solution, Inc. – www.issi.com Rev.0A, 05/14/2012 1.2 1.6 2 2.4 2.8 3.2 Output Power(W) Figure 8 Efficiency vs. Output Power 7 IS31AP2145B 1.4 1.8 1.2 1.4 Output Power(W) Output Power(W) 1.6 RL = 8Ω+33µH AGC OFF THD+N = 10% 1.2 1 0.8 0.6 RL = 8Ω+33µH AGC1 1 THD+N = 10% 0.8 0.6 THD+N = 1% 0.4 THD+N = 1% 0.4 0.2 0.2 0 2.5 3 3.5 4 4.5 0 2.5 5 3 Supply Voltage(V) Figure 9 Output Power vs. Supply Voltage 4.5 5 Figure 10 Output Power vs. Supply Voltage 2 RL = 4Ω+33µH AGC OFF 1.8 RL = 4Ω+33µH AGC1 1.6 2 Output Power(W) Output Power(W) 4 Supply Voltage(V) 3 2.5 3.5 THD+N = 10% 1.5 THD+N = 1% 1 THD+N = 10% 1.4 1.2 1 0.8 THD+N = 1% 0.6 0.4 0.5 0.2 0 2.5 3 3.5 4 4.5 5 0 2.5 3 Supply Voltage(V) Figure 11 3.5 4 4.5 5 Supply Voltage(V) Output Power vs. Supply Voltage Figure 12 Output Power vs. Supply Voltage +0 -20 VCC = 3.6V, 4.2V RL = 8Ω+33μH PSRR(dB) -40 -60 -80 -100 -120 20 50 100 200 500 1k 2k 5k 10k 20k Frequency(Hz) Figure 13 PSRR vs. Frequency Integrated Silicon Solution, Inc. – www.issi.com Rev.0A, 05/14/2012 8 IS31AP2145B FUNCTIONAL BLOCK DIAGRAM VCC Internal Oscillator OTP VREF OCP RIN 28.5k OUT+ IN- PWM IN+ H-Bridge OUT- RIN 28.5k CTRL Control Logic AGC Bias GND Integrated Silicon Solution, Inc. – www.issi.com Rev.0A, 05/14/2012 9 IS31AP2145B APPLICATION INFORMATION DIGITAL AMPLIFIER The IS31AP2145B is a [email protected] mono, clip-less, filter-less, high efficiency Class-D audio power amplifier with automatic gain control. The IS31AP2145B integrates AGC (Automatic Gain Control) function to automatically prevent distortion of the audio signal by which we can enhance audio quality and also protect speaker from damage at high power levels. In addition, IS31AP2145B has been designed so that high-efficiency can be maintained within an average power range that is used for mobile terminal. Figure 14 Integrated Silicon Solution, Inc. – www.issi.com Rev.0A, 05/14/2012 AGC (AUTOMATIC GAIN CONTROL) CONTROL 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 AGC function, IS31AP2145B lowers the gain of the digital amplifier to an appropriate value so as not to cause clipping at the differential signal output (Figure 14). Operation of AGC Function 10 IS31AP2145B The attack time and the release time of AGC control have two levels (refer to Table 1). They are selected by the voltage at the CTRL terminal (refer to Table 2). The attack time is a time interval that gain falls from 18dB to 10dB with a big signal input enough. And the release time is a time from target attenuation to no AGC attenuation. Table 1 Table 2 CTRL1 CTRL2 Mode H H AGC1 H GND AGC2 GND H AGC OFF GND GND Shutdown Attack Time and Release Time AGC Mode Attack Time Release Time AGC1 (Recommended) 45ms 2.6s AGC2 10ms 1.2s Assuming no limitation by the power supply, the audio output signal would be as in Figure 15. Figure 15 Assuming no Restriction from Power Supply, the Audio Output Signal In normal operation without the AGC, the output is distorted because of the restriction from power supply, as shown in Figure 16. Figure 16 AGC Function Off With the AGC function of IS31AP2145B, the optimum output power can be obtained along with the minimal distortion. The Figure 17 shows the outcome of AGC function. Attack Time Mode Setting “H” level indicates a microcomputer’s I/O port H level output voltage that is input to CTRL1 and CTRL2 terminals and GND indicates GND of the microcomputer. GND level of the microcomputer must be the same as that of IS31AP2145B. The control of CTRL terminal is based on I/O port H level output voltage of microcomputer that is connected. Set resistance constants according to I/O port H level output voltage of each microcomputer as Table 3 below. Table 3 Resistors Setting VI/O 1.8V 2.6V 2.8V 3.0V 3.3V 5.0V R1 27kΩ 33kΩ 33kΩ 33kΩ 33kΩ 56kΩ R2 56kΩ 68kΩ 68kΩ 68kΩ 68kΩ 120kΩ R3 82kΩ 27kΩ 24kΩ 22kΩ 18kΩ 15kΩ Functions of CTRL pin are designed with their control by two control pins (CTRL1 and CTRL3). Only a switching control between AGC1 Mode and Shutdown Mode is available when a single control terminal is used (Table 4 and Figure 19). Release Time Figure 17 AGC Function On Figure 19 CTRL TERMINAL FUNCTION By setting the threshold voltage of each mode to CTRL terminal, the followings can be set: AGC1, AGC2, AGC OFF, and Shutdown Mode (Table 2 and Figure 18). Table 4 AGC1 Mode Circuit Mode Setting CTRL1 Mode H AGC1 GND Shutdown SYSTEM TIMING Figure 18 AGC Function Mode Setting Integrated Silicon Solution, Inc. – www.issi.com Rev.0A, 05/14/2012 The CTRL terminal should be configured as the Figure 20. When in the Shutdown Mode, the level of the terminal must not be changed from GND level during tSD. When the IS31AP2145B wakes up, the CTRL terminal must be set to H level first, then enter the setting mode. 11 IS31AP2145B Figure 20 System Timing INPUT CAPACITORS (CIN) DECOUPLING CAPACITOR (CS) The input capacitors (CIN) and internal resistor (RIN = 28.5kΩ) form a high-pass filter with the corner frequency, fC, determined in Equation (1). The IS31AP2145B 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 VCC lead works best. Placing this decoupling capacitor close to the IS31AP2145B 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. 1 f c 2R C IN IN (1) For example, in figure 1, CIN = 33nF, RIN = 28.5kΩ, 1 f 169 Hz c 2 28 .5k 33 nF 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. So, Integrated Silicon Solution, Inc. – www.issi.com Rev.0A, 05/14/2012 12 IS31AP2145B CLASSIFICATION REFLOW PROFILES Profile Feature Pb-Free Assembly Preheat & Soak Temperature min (Tsmin) Temperature max (Tsmax) Time (Tsmin to Tsmax) (ts) 150°C 200°C 60-120 seconds Average ramp-up rate (Tsmax to Tp) 3°C/second max. Liquidous temperature (TL) Time at liquidous (tL) 217°C 60-150 seconds Peak package body temperature (Tp)* Max 260°C Time (tp)** within 5°C of the specified classification temperature (Tc) Max 30 seconds Average ramp-down rate (Tp to Tsmax) 6°C/second max. Time 25°C to peak temperature 8 minutes max. Figure 21 Classification Profile Integrated Silicon Solution, Inc. – www.issi.com Rev.0A, 05/14/2012 13 IS31AP2145B PACKAGING INFORMATION UTQFN-9 Note: All dimensions in millimeters unless otherwise stated. Integrated Silicon Solution, Inc. – www.issi.com Rev.0A, 05/14/2012 14