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| (R) Rev. 1.4 2.0Watt Audio Power Amplifier GENERAL DESCRIPTION The LY8892 is a 2.0W audio power amplifier. It is capable of driving 4 speaker load at a continuous average output of 2.0W with less than 10% distortion (THD+N) from a 5.5V power supply and 8 speaker load at a continuous average output of 1.5W with less than 10% distortion (THD+N) from a 5.5V power supply. The LY8892 primarily designed for high quality application in other portable communication device. And the LY8892 audio amplifier features low power consumption shutdown mode. To facilitate this, The shutdown function may be enabled by either logic high or low depending on mode selection. Driving the shutdown mode pin either high or low enables the shutdown pin to be driven in a likewise manner to enable shutdown. And the LY8892 has an internal thermal shutdown protection feature. The LY8892 audio amplifier was designed specifically to provide high quality output power with a minimal amount of external components. The LY8892 does not require output capacitors, and the LY8892 is ideally suited for other low voltage applications or portable electronic devices where minimal power consumption is a primary requirement. LY8892 FEATURES 2.5V~5.5V Power supply. Thermal shutdown Protection. Low current shutdown mode No output capacitors and networks or bootstrap capacitors required Low noise during turn-on and turn-off transitions User selectable shutdown logic level. (High or Low) (MSOP10 & DFN10 only) Lead free and green package available. (RoHS Compliant) Space Saving Package -- 8-pin MSOP package. -- 8-pin DFN Package -- 10-pin MSOP package. -- 10-pin DFN Package APPLICATION Portable electronic devices Mobile Phones PDAs PIN CONFIGURATION Lyontek Inc. reserves the rights to change the specifications and products without notice. 5F, No. 2, lndustry E . Rd. IX, Science-Based Industrial Park, Hsinchu 300, Taiwan TEL: 886-3-6668838 FAX: 886-3-6668836 1 (R) Rev. 1.4 2.0Watt Audio Power Amplifier LY8892 PIN DESCRIPTION SYMBOL SHUTDOWN Pin No. MSOP8 1 2 -3 4 5 -6 7 8 DFN8 1 2 -3 4 5 -6 7 8 MSOP10 1 2 3 4 5 6 7 8 9 10 DFN10 1 2 3 4 5 6 7 8 9 10 Bypass pin DESCRIPTION Shutdown the device Shutdown Mode Selectable Positive Input Negative Input Negative output No Connection Power Supply Ground Positive Output BYPASS SD MODE +IN -IN Vo1 NC VDD GND Vo2 Lyontek Inc. reserves the rights to change the specifications and products without notice. 5F, No. 2, lndustry E . Rd. IX, Science-Based Industrial Park, Hsinchu 300, Taiwan TEL: 886-3-6668838 FAX: 886-3-6668836 2 (R) Rev. 1.4 2.0Watt Audio Power Amplifier LY8892 APPLICATION CIRCUIT Figure 1. Application Schematic with Single -Ended Input (DFN10 and MSOP10 package) Figure 2. Application Schematic with Differential Input (DFN10 and MSOP10 package) Lyontek Inc. reserves the rights to change the specifications and products without notice. 5F, No. 2, lndustry E . Rd. IX, Science-Based Industrial Park, Hsinchu 300, Taiwan TEL: 886-3-6668838 FAX: 886-3-6668836 3 (R) Rev. 1.4 2.0Watt Audio Power Amplifier LY8892 ABSOLUTE MAXIMUN RATINGS* PARAMETER Supply Voltage Operating Temperature Input Voltage Storage Temperature Power Dissipation ESD Susceptibility Junction Temperature Soldering Temperature (under 10 sec) SYMBOL VDD TA VI TSTG PD VESD TJMAX TSOLDER RATING 6.0 -40 to 85 (I grade) -0.3V to VDD +0.3V -65 to 150 Internally Limited 2000 150 260 UNIT V V W V DC ELECTRICAL CHARACTERISTICS (VDD=5V, TA=25) PARAMETER Power Supply Current Shutdown Current Shutdown Voltage Input High Shutdown Voltage Input Low Shutdown Voltage Input High Shutdown Voltage Input Low Output Offset Voltage Resistor Output to GND SYMBOL IDD ISD VSDIH VSDIL VSDIH VSDIL VOS ROUT-GND TEST CONDITION VIN = 0V, IO = 0A, 8 Load VSHUTDOWN = VSD Mode VSD Mode = VDD VSD Mode = VDD VSD Mode = GND VSD Mode = GND MIN. 7.0 TYP. 5.0 0.1 1.5 1.3 1.5 1.3 7.0 8.5 1.0 1.4 1.4 1.8 2.0 0.13 62 (f = 217Hz) 66 (f = 1kHz) 145 170 1.0 MAX. 15.0 2.0 50.0 9.7 % dB W UNIT mA A V mV k Output Power Total Harmonic Distortion+ Noise Power Supply Rejection Ratio Wake-up time Thermal Shutdown Temperature Shut Down Time THD = 1% , f = 1 kHz RL=8 THD = 10% , f = 1 kHz RL=8 THD = 1% , f = 1 kHz Po RL=4 THD = 10% , f = 1 kHz RL=4 THD = 10% , f = 1 kHz RL=4 (at 5.5V) THD+N Po = 0.4 Wrms; f = 1kHz Vripple = 200mV sine p-p Input terminated with 10 PSRR to GND TWU TSD TSDT Bypass Cap.=1.0uF, 5.0V 8 load 150 190 ms ms Lyontek Inc. reserves the rights to change the specifications and products without notice. 5F, No. 2, lndustry E . Rd. IX, Science-Based Industrial Park, Hsinchu 300, Taiwan TEL: 886-3-6668838 FAX: 886-3-6668836 4 (R) Rev. 1.4 2.0Watt Audio Power Amplifier LY8892 DC ELECTRICAL CHARACTERISTICS (VDD=3V, TA=25) PARAMETER Power Supply Current Shutdown Current Shutdown Voltage Input High Shutdown Voltage Input Low Shutdown Voltage Input High Shutdown Voltage Input Low Output Offset Voltage Resistor Output to GND SYMBOL IDD ISD VSDIH VSDIL VSDIH VSDIL VOS ROUT-GND TEST CONDITION VIN = 0V, IO = 0A, 8 Load VSHUTDOWN = = VSD Mode VSD Mode = VDD VSD Mode = VDD VSD Mode = GND VSD Mode = GND MIN. 7.0 TYP. 4.5 0.1 1.2 1.0 1.2 1.0 7.0 8.5 375 460 460 600 0.13 56 (f = 217Hz) 62 (f = 1kHz) 82 170 MAX. 14.0 2.0 50.0 9.7 mW % dB UNIT mA A V mV k Output Power Total Harmonic Distortion+ Noise Power Supply Rejection Ratio Wake-up time Thermal Shutdown Temperature THD = 1% , f = 1 kHz RL=8 THD = 10% , f = 1 kHz RL=8 Po THD = 1% , f = 1 kHz RL=4 THD = 10% , f = 1 kHz RL=4 THD+N Po = 0.25 Wrms , f = 1kHz Vripple = 200mV sine p-p Input terminated with 10 PSRR to GND TWU TSD 150 190 ms ORDERING INFORMATION LY 8 892 VV V : Package Type BL8-Pin DFN BB10-Pin DFN UL8-Pin MSOP UB10-Pin MSOP Product Name A : Product Line LY : Lyontek Product Number Prefix Lyontek Inc. reserves the rights to change the specifications and products without notice. 5F, No. 2, lndustry E . Rd. IX, Science-Based Industrial Park, Hsinchu 300, Taiwan TEL: 886-3-6668838 FAX: 886-3-6668836 5 (R) Rev. 1.4 2.0Watt Audio Power Amplifier LY8892 APPLICATION INFORMATION BRIDGED CONFIGURATION EXPLANATION As shown in Figure 1, the LY8892 has two operational amplifiers internally, allowing for a few different amplifier configurations. The first amplifier's gain is externally configurable, while the second amplifier is internally fixed in a unity-gain, inverting configuration. The closed-loop gain of the first amplifier is set by selecting the ratio of Rf to RIN while the second amplifier's gain is fixed by the two internal 20k resistors. Figure 1 shows that the output of amplifier one serves as the input to amplifier two which results in both amplifiers producing signals identical in magnitude, but out of phase by 180. Consequently, the differential gain for the IC is AVD= 2 X ( Rf / RIN ) By driving the load differentially through outputs Vo1 and Vo2, an amplifier configuration commonly referred to as "bridged mode" is established. Bridged mode operation is different from the classical single-ended amplifier configuration where one side of the load is connected to ground. A bridge amplifier design has a few distinct advantages over the single-ended configuration, as it provides differential drive to the load, thus doubling output swing for a specified supply voltage. Four times the output power is possible as compared to a single-ended amplifier under the same conditions. This increase in attainable output power assumes that the amplifier is not current limited or clipped. In order to choose an amplifier's closed-loop gain without causing excessive clipping, please refer to the Audio Power Amplifier Design section. A bridge configuration, such as the one used in the LY8892, also creates a second advantage over single -ended amplifiers. Since the differential outputs, Vo1 and Vo2, are biased at half-supply, no net DC voltage exists across the load. This eliminates the need for an output coupling capacitor which is required in a single supply, single-ended amplifier configuration. Without an output coupling capacitor, the half-supply bias across the load would result in both increased internal IC power dissipation and also possible loudspeaker damage. Power Dissipation Power dissipation is a major concern when designing a successful amplifier, whether the amplifier is bridged or single-ended. A direct consequence of the increased power delivered to the load by a bridge amplifier is an increase in internal power dissipation. Since the LY8892 has two operational amplifiers in one package, the maximum internal power dissipation is 4 times that of a single-ended amplifier. The maximum power dissipation for a given application can be derived from the power dissipation graphs of from equation 1. PDMAX = 4 X (VDD)2 / (2 2 RL) ...................................(1) It is critical that the maximum junction temperature TJMAX of 150C is not exceeded. TJMAX can be determine from the power derating curves by using PDMAX and the PC board foil area. By adding additional copper foil, the thermal resistance of the application can be reduced, resulting in higher PDMAX. Additional copper foil can be added to any of the leads connected to the LY8892.If TJMAX still exceeds 150C, then additional changes must be made. These changes can include reduced supply voltage, higher load impedance, or reduced ambient temperature. Internal power dissipation is a function of output power. POWER SUPPLY BYPASSING As with any amplifier, proper supply bypassing is critical for low noise performance and high power supply rejection. The capacitor location on both the bypass and power supply pins should be as close to the device as possible. Lyontek Inc. reserves the rights to change the specifications and products without notice. 5F, No. 2, lndustry E . Rd. IX, Science-Based Industrial Park, Hsinchu 300, Taiwan TEL: 886-3-6668838 FAX: 886-3-6668836 6 (R) Rev. 1.4 2.0Watt Audio Power Amplifier LY8892 Figure 3. Audio Amplifier with Single -Ended Input Application Schematic (DFN10 & MSOP10 package) Figure 4. Audio Amplifier with Differential Input Application Schematic (DFN10 & MSOP10 package) Lyontek Inc. reserves the rights to change the specifications and products without notice. 5F, No. 2, lndustry E . Rd. IX, Science-Based Industrial Park, Hsinchu 300, Taiwan TEL: 886-3-6668838 FAX: 886-3-6668836 7 (R) Rev. 1.4 2.0Watt Audio Power Amplifier LY8892 PACKAGE OUTLINE DIMENSION 8 Pin MSOP Package Outline Dimension Lyontek Inc. reserves the rights to change the specifications and products without notice. 5F, No. 2, lndustry E . Rd. IX, Science-Based Industrial Park, Hsinchu 300, Taiwan TEL: 886-3-6668838 FAX: 886-3-6668836 8 (R) Rev. 1.4 2.0Watt Audio Power Amplifier LY8892 10-Pin MSOP Package Outline Dimension Lyontek Inc. reserves the rights to change the specifications and products without notice. 5F, No. 2, lndustry E . Rd. IX, Science-Based Industrial Park, Hsinchu 300, Taiwan TEL: 886-3-6668838 FAX: 886-3-6668836 9 (R) Rev. 1.4 2.0Watt Audio Power Amplifier LY8892 8-Pin DFN Package Outline Dimension Lyontek Inc. reserves the rights to change the specifications and products without notice. 5F, No. 2, lndustry E . Rd. IX, Science-Based Industrial Park, Hsinchu 300, Taiwan TEL: 886-3-6668838 FAX: 886-3-6668836 10 (R) Rev. 1.4 2.0Watt Audio Power Amplifier LY8892 10-Pin DFN Package Outline Dimension Lyontek Inc. reserves the rights to change the specifications and products without notice. 5F, No. 2, lndustry E . Rd. IX, Science-Based Industrial Park, Hsinchu 300, Taiwan TEL: 886-3-6668838 FAX: 886-3-6668836 11 |
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