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| (R) LY8602 Rev. 1.3 Dual 2.0W/CH Stereo Audio Amplifier GENERAL DESCRIPTION The LY8602 is a dual stereo audio power amplifier. It is capable of driving 4 speaker load at a continuous average output of 2.0W / 10% distortion (THD+N) from a 5.5V power supply. TheLY8602 primarily designed for high quality output power from application in other portable communication device and portable device. The LY8602 audio amplifier features low power consumption in shutdown mode. It is achieved by driving the shutdown pin with logic low. And the LY8602 has an internal thermal shutdown protection feature. To simplify audio system design of the LY8602. It is ideally suited for other low voltage applications or portable electronic devices where minimal power consumption is a primary requirement. FEATURES 2.5V~5.5V Power supply. Thermal shutdown Protection. Low current shutdown mode Low noise during turn-on and turn-off transitions. Support "Click and pop" suppression circuitry Lead free and green package available. (RoHS Compliant) Space Saving Package -- MSOP 10 pin Package. -- DFN 10 pin Package. APPLICATION Portable and desktop computers Multimedia Monitors Portable Audio System PIN CONFIGURATION LY8602 MSOP10 Pin Configuration (Top View) 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 1 FAX: 886-3-6668836 (R) LY8602 Rev. 1.3 Dual 2.0W/CH Stereo Audio Amplifier LY8602 DFN10 Pin Configuration (Top View) PIN DESCRIPTION SYMBOL SHUTDOWN BYPASS +OUTA -OUTA -INA -INB -OUTB VDD Pin No. MSOP 1 2 3 4 5 6 7 8 9 10 DFN 1 2 3 4 5 6 7 8 9 10 Bypass Pin Positive BTL output of A channel. Negative BTL output of A channel. Negative Input of A channel. Negative Input of B channel. Negative BTL output of B channel. Power Supply Positive BTL output of B channel. Ground DESCRIPTION Shutdown control.(when low level is active the pin) +OUTB GND 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 2 FAX: 886-3-6668836 (R) LY8602 Rev. 1.3 Dual 2.0W/CH Stereo Audio Amplifier TYPICAL APPLICATION CIRCUIT Figure 1. LY8602 Typical Application Circuit 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 3 FAX: 886-3-6668836 (R) LY8602 Rev. 1.3 Dual 2.0W/CH Stereo Audio Amplifier ABSOLUTE MAXIMUN RATINGS* PARAMETER Supply Voltage Operating Temperature Input Voltage Storage Temperature Power Dissipation ESD Susceptibility Junction Temperature Soldering Information SYMBOL VDD TA VI TSTG PD VESD TJMAX Vapor Phase (60 sec.) Infrared (15 sec.) RATING 6.0 -40 to 85 (I grade) -0.3V to VDD +0.3V -65 to 150 Internally Limited 2000 150 215 220 UNIT V V W V DC ELECTRICAL CHARACTERISTICS (VDD=5V, TA=25) PARAMETER Power Supply Current Shutdown Current Shutdown High Input Voltage Shutdown Low Input Voltage Wake-up time Output Offset Voltage SYMBOL IDD ISD VIH VIL TWU VOS TEST CONDITION VIN = 0V, IO = 0A, 8 Load (BTL) VSHUTDOWN = 0V MIN. 1.4 TYP. 8.5 0.3 172 7.0 1.1 1.4 1.4 1.8 2.0 0.11 62 (f = 217Hz) 66 (f = 1kHz) 170 1.0 190 % dB ms W MAX. 21.0 2.0 0.4 50.0 UNIT mA A V V ms mV Bypass cap.=1.0uF THD = 1%, f = 1 kHz, RL=8 THD = 10%, f = 1 kHz RL=8 THD = 1%, f = 1 kHz Output Power Po RL=4 THD = 10%, f = 1 kHz RL=4 THD = 10%, f = 1 kHz RL=4 (at 5.5V) Po = 0.4 Wrms; f = 1kHz, Total Harmonic Distortion+ Noise THD+N RL=8 Vripple = 200mV sine p-p Input terminated with 10 Power Supply Rejection Ratio PSRR to GND Thermal Shutdown Temperature Shutdown Time TSD TSDT 8 load 150 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 4 FAX: 886-3-6668836 (R) LY8602 Rev. 1.3 Dual 2.0W/CH Stereo Audio Amplifier DC ELECTRICAL CHARACTERISTICS (VDD=3V, TA=25) PARAMETER Power Supply Current Shutdown Current Shutdown High Input Voltage Shutdown Low Input Voltage Wake-up time Output Offset Voltage SYMBOL IDD ISD VIH VIL TWU VOS TEST CONDITION VIN = 0V, IO = 0A, 8 Load (BTL) VSHUTDOWN = 0V MIN. 1.4 TYP. 6.3 0.1 82 7.0 0.37 0.46 W 0.46 0.6 0.12 56 (f = 217Hz) 62 (f = 1kHz) 170 1.0 190 % dB ms MAX. 15.5 2.0 0.4 50 UNIT mA A V V ms mV Bypass cap.=1.0uF THD = 1%, f = 1 kHz, RL=8 THD = 10%, f = 1 kHz RL=8 Output Power Po THD = 1%, f = 1 kHz RL=4 THD = 10%, f = 1 kHz RL=4 Po = 0.2 Wrms; f = 1kHz, Total Harmonic Distortion+ Noise THD+N RL=8 Vripple = 200mV sine p-p Input terminated with 10 Power Supply Rejection Ratio PSRR to GND Thermal Shutdown Temperature Shutdown Time TSD TSDT 8 load 150 ORDERING INFORMATION LY 8 602 VV V : Package Type UL : 10-PIN MSOP BL : 10-PIN DFN 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 5 FAX: 886-3-6668836 (R) LY8602 Rev. 1.3 Dual 2.0W/CH Stereo Audio Amplifier APPLICATION INFORMATION 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 10 F in parallel with a 0.1 F 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 1.0 F tantalum bypass capacitance connected between the LY8602's supply pins and ground. Do not substitute a ceramic capacitor for the tantalum. Doing so may cause oscillation. Keep the length of leads and traces that connect capacitors between the LY8602's power supply pin and ground as short as possible. MICRO-POWER SHUTDOWN The voltage applied to the SHUTDOWN pin controls the LY8602's shutdown function. Activate micro-power shutdown by applying GND to the SHUTDOWN pin. When active, the LY8602's micro-power shutdown feature turns off the amplifier's bias circuitry, reducing the supply current. The low 0.1 A typical shutdown current is achieved by applying a voltage that is as near as GND as possible to the SHUTDOWN pin. Bypass Capacitor Value Selection Besides minimizing the input capacitor size, careful consideration should be paid to value of C3, the capacitor connected to the BYPASS pin. Since C3 determines how fast the LY8602 settles to quiescent operation, its value is critical when minimizing turn-on pops. The slower the LY8602's outputs ramp to their quiescent DC voltage (nominally 1/2 VDD), the smaller the turn-on pop. Choosing C6 equal to 1.0 F along with a small value of C1,C2 (in the range of 0.1 F to 0.39 F), produces a click-less and pop-less shutdown function. As discussed above, choosing C1,C2 no larger than necessary for the desired bandwith helps minimize clicks and pops. OPTIMIZING CLICK AND POP REDUCTION PERFORMANCE The LY8602 contains circuitry that minimizes turn-on and shutdown transients or "clicks and pop". For this discussion, turn-on refers to either applying the power supply voltage or when the shutdown mode is deactivated. When the part is turned on, an internal current source changes the voltage of the BYPASS pin in a controlled, linear manner. Ideally, the input and outputs track the voltage applied to the BYPASS pin. The gain of the internal amplifiers remains unity until the voltage on the bypass pin reaches 1/2 VDD. As soon as the voltage on the bypass pin is stable, the device becomes fully operational. Although the BYPASS pin current cannot be modified, changing the size of C3 alters the device's turn-on time and the magnitude of "clicks and pops". Increasing the value of C3 reduces the magnitude of turn-on pops. However, this presents a tradeoff: as the size of C3 increases, the turn-on time increases. There is a linear relationship between the size of C3 and the turn-on time. Here are some typical turn-on times for various values of C3: In order eliminate "clicks and pops", all capacitors must be discharged before turn-on. Rapidly switching VDD on and off may not allow the capacitors to fully discharge, which may cause "clicks and pops". In a single -ended configuration, the output is coupled to the load by C1,C2. This capacitor usually has a high value. C1,C2 discharges through internal 20k resistors. Depending on the size of C1,C2, the discharge time constant can be relatively large. To reduce transients in single-ended mode, an external 1k - 5k resistor can be placed in parallel with the internal 20k resistor. The tradeoff for using this resistor is increased quiescent current. TABLE 2. C3 and TON Truth Table C3 TON (Typ.) at 5.0V 1.0uF 172 ms 0.47uF 76 ms 0.33uF 60 ms 0.22uF 50 ms 0.1uF 36 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 6 FAX: 886-3-6668836 (R) LY8602 Rev. 1.3 Dual 2.0W/CH Stereo Audio Amplifier PACKAGE OUTLINE DIMENSION 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 7 FAX: 886-3-6668836 (R) LY8602 Rev. 1.3 Dual 2.0W/CH Stereo Audio Amplifier 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 8 FAX: 886-3-6668836 |
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