MD3203 Filterless 3W Class-D Stereo Audio Amplifier Key Features General Description 3W Output at 10% THD with a 4Ω Load and 5V Power The MD3203 Supply THD+N feature offers high-quality sound reproduction. The Filterless,Low Quiescent Current and Low EMI new filterless architecture allows the device to drive speaker High Efficiency up to 90% directly instead of using low-pass output filters,therefore save Superior Low Noise system cost and PCB area. Short Circuit Protection With the same number of external components,the efficiency Thermal Shutdown of the MD3203 is much better than that of class-AB cousins . Few External Components to Save Space and Cost It can optimize battery life thus is ideal for portable SOP-16 applications. Packages Available Pb-Free Package Applications LCD Monitors / TV Projectors Notebook Computers Portable Speakers Walkie Takie Handsfree phones/Speaker Phones Cellular Phones Typical Application 电话:0755-82709111 827091112 827091113 传真:0755-82709114 地址:深圳市福田区中航路鼎诚国际大厦南座 2805 室 网址:Http://www.YR-IC.com is a 3w class-D audio amplifier. Its low MD3203 Filterless 3W Class-D Stereo Audio Amplifier Block Diagram Pin Configuration & Marking Information 电话:0755-82709111 827091112 827091113 传真:0755-82709114 地址:深圳市福田区中航路鼎诚国际大厦南座 2805 室 网址:Http://www.YR-IC.com MD3203 Filterless 3W Class-D Stereo Audio Amplifier Pin Descriptions Absolute Maximum Ratings These are stress ratings only and functional operation is not implied. Exposure to absolute maximum ratings 电话:0755-82709111 827091112 827091113 传真:0755-82709114 地址:深圳市福田区中航路鼎诚国际大厦南座 2805 室 网址:Http://www.YR-IC.com periods may affect device reliability. All voltages are with respect to ground. for prolonged time MD3203 Filterless 3W Class-D Stereo Audio Amplifier Symbol VIN Parameter Test Conditions Supply Power THD+N=1%,f=1kHz, R =4Ω Output Power THD+N=10%,f=1kHz,R=8Ω THD+N=1%,f=1kHz,R=8Ω VDD =5.0V,Po=0.5W,R =8Ω Total Harmonic Distortion Plus THD+N Noise VDD =3.6V,Po=0.5W,R =8Ω VDD =5.0V,Po=1W,R =4Ω VDD =3.6V,Po=1W,R =4Ω Gv PSRR Cs SNR Vn Dyn η 3.2 VDD=3.6V 1.6 VDD=3.0V 1.3 VDD=5.0V 2.5 VDD=3.6V 1.3 VDD=3.0V 0.85 VDD=5.0V 1.8 VDD=3.6V 0.9 VDD=3.0V 0.6 VDD=5.0V 1.4 VDD=3.6V 0.72 VDD=3.0V 0.45 f=1kHz f=1kHz Signal-to-noiseratio Outputnoise Dynamicrange 0.11 Quiescent Current 传真:0755-82709114 地址:深圳市福田区中航路鼎诚国际大厦南座 2805 室 网址:Http://www.YR-IC.com W W W % % dB -58 VDD =3.6V,Po=1W,R =4Ω f=1kHz -95 dB VDD =5V, Vorms=1v,Gv=20dB f=1kHz 80 dB VDD =5V,Inputs ac-grounded with CIN =0.47μF VDD =5.0V,THD=1% R L =4Ω,THD=10% VDD=3.6V VDD=3.0V 电话:0755-82709111 827091112 827091113 W f=1kHz A-weighting 100 NoA-weighting 150 f=1kHz 90 f=1kHz VDD=5.0V IQ 0.15 v -59 R L =8Ω,THD=10% Efficiency 0.11 UNIT f=100Hz CIN =0.47μF Crosstalk 0.15 24 VDD =5V,Inputs ac-grounded with MAX 5.5 VDD=5.0V Gain PSRR Power Supply Ripple Rejection TYP 2.5 THD+N=10%,f=1kHz, R=4Ω Po MIN 87 83 dB μV dB % 16 Noload 10 8 mA MD3203 Filterless 3W Class-D Stereo Audio Amplifier 电话:0755-82709111 827091112 827091113 传真:0755-82709114 地址:深圳市福田区中航路鼎诚国际大厦南座 2805 室 网址:Http://www.YR-IC.com MD3203 Filterless 3W Class-D Stereo Audio Amplifier 电话:0755-82709111 827091112 827091113 传真:0755-82709114 地址:深圳市福田区中航路鼎诚国际大厦南座 2805 室 网址:Http://www.YR-IC.com MD3203 Filterless 3W Class-D Stereo Audio Amplifier 电话:0755-82709111 827091112 827091113 传真:0755-82709114 地址:深圳市福田区中航路鼎诚国际大厦南座 2805 室 网址:Http://www.YR-IC.com MD3203 Filterless 3W Class-D Stereo Audio Amplifier Application Notes device. 1. When then MD3203 works with LC filters, it should be NI-MH(Nickel Metal Hydride)rechargeable batteries or 3 dry connected with the speaker before it’s powered on,otherwise it or alkaline batteries. will be damaged easily. 4. One should not make the input signal too large. Large signal 2. When the MD3203 works without LC filters, it’s better to can cause the clipping of output signal when increasing the add a ferrite chip bead at the outgoing line of speaker for volume. This will damage the device because of big gain of the suppressing the possible electromagnetic interference. MD3203 3. The recommended operating voltage is 5.5V. 5. When testing the MD3203 without When the Therefore, it’s recommened to use either 4 LC filters by using MD3203 is powered with 4 battery cells, it should be noted resistor instead of speaker as the output load, the test results, that the voltage of 4 new dry or alkaline batteries is over 6.0V, e.g. THD or efficiency, will be worse than those of using higher than its operation voltage, which will speaker as load. Test Setup for Performance Testing Notes 1. The AP AUX-0025 low pass filter is necessary for class-D amplifier measurement with AP analyzer. Application Information 2. Two 22µH inductors are used in series with load resistor to emulate the small speaker for efficiency measurement. Maximum Gain As shown in block diagram(page 2),the MD3203 has two input to amplifier 2, thus the two amplifiers produce internal amplifier stages.The first stage’s gain is signals identical in magnitude,but different in externally configurable,while the second stage’s is phase by 180º.Consequentl,the differential gain for internally fixed. The closed-loop gain of the first the stage is set by selecting the ratio of Rf to Ri while AVD=20*log[2*(Rf/Ri)] The MD3203 sets maximum Rf=142k 电话:0755-82709111 827091112 827091113 传真:0755-82709114 地址:深圳市福田区中航路鼎诚国际大厦南座 2805 室 网址:Http://www.YR-IC.com IC is MD3203 Filterless 3W Class-D Stereo Audio Amplifier the second stage’s gain is fixed at 2x. The output Ω ,minimum of amplifier 1 serves as the 24dB. Ri=18k Ω ,so the maximum closed-gain is Mute Operation The MUTE pin is an input for controlling the output enable of theOutputs without a volume fade .Quiescent state of the MD3203,A logic low on this pin disables current is listed in the electrical characteristic the outputs,and a logic high on this pin enables the table.Te MUTE pin can be left floating due to the outputs,This pin may be used as quick disable or internal pull-up. Shutdown operation In order to reduce power consumption while not in applied to the SHDN pin,By switching the SHDN pin use,the MD3203 contains shutdown circuitry to turn off connected to GND,the MD3203 supply current draw will the amplifier’s bias circuitry. This shutdown be minimized in idle mode,The feature turns the amplifier off when logic low is floating due to the internal pull-up. SHDN pin can be left Power supply decoupling The MD3203 is a high performance CMOS audio amplifier frequency transients,spikes,or digital has on the that requires adequate power supply decoupling to line,a ensure the output THD and PSRR as low as possible . equivalent-series-resistance(ESR)ceramic Power supply decoupling affects low as possible . capacitor, typically 1.0μF ,works best, placing it Power frequency as close as possible to the device VDD terminal.For response. Optimum decoupling is achieved by using two filtering lower-frequency noise signals,a large capacitors of different types targeting to different capacitor types of noise on the power supply leads. For higher recommended,placing supply decoupling affects low good of 20 μ F it low (ceramic) near or the greater audio is power amplifier. Input Capacitor(Ci) Large input capacitors are both expensive and space filter with the corner hungry for portable designs. Clearly,acertain sized equation below, capacitor is needed to couple in low frequencies cost and size,click and pop performance is affected without severe attenuation.But in many cases the by the size of the input coupling capacitor Ci.A speakers used inportable systems,whether internal or larger input coupling capacitor requires more charge external,have little ability to reproduce signals to reach its quiescent DC voltage(nominall 1/2 VDD). below 100Hz to 150Hz,Thus,using a large input This charge comes from the internal circuit via the capacitor system feedback and is apt to create pops upon device performance .In this case,input capacitor(Ci)and enable.Thus,by minimizing the capacitor size based input resistance (Ri) of the amplifier form a high-pass on necessary low frequency response, turn-on pops can may not increase actual frequency determined by fc=1/2TTRiCi in addition to system be minimized. Analog Reference Bypass Capacitor(CBYP) The analog Reference Bypass Capacitor(CBYP)is the most reference to the amplifier,which appears as degraded critical capacitor and serves several important PSRR and THD+N. functions.During start-up or recovery from shutdown A ceramic bypass capacitor(CBYP)with values of 0.47 mode, CBYP determines the rate at which the amplifier μF to 1.0μF .is recommended for the best THD and starts up.The second function is to reduce noise noise performance.Increasing the bypass capacitor 电话:0755-82709111 827091112 827091113 传真:0755-82709114 地址:深圳市福田区中航路鼎诚国际大厦南座 2805 室 网址:Http://www.YR-IC.com MD3203 Filterless 3W Class-D Stereo Audio Amplifier caused by the power supply coupling into the output reduces clicking and popping noise from power on/off drive signal.This noise is from the internal analog and entering and leaving shutdown. Ordering Information 电话:0755-82709111 827091112 827091113 传真:0755-82709114 地址:深圳市福田区中航路鼎诚国际大厦南座 2805 室 网址:Http://www.YR-IC.com MD3203 Filterless 3W Class-D Stereo Audio Amplifier Symbol Dimensions Millimeters Min Max A 1.350 1.750 A1 0.100 0.250 A2 1.350 1.550 B 0.330 0.510 C 0.190 0.250 D 9.800 10.000 E 3.800 4.000 E1 5.800 e 6.300 1.270（TYP） L 0.400 1.270 θ 0° 8° 电话:0755-82709111 827091112 827091113 传真:0755-82709114 地址:深圳市福田区中航路鼎诚国际大厦南座 2805 室 网址:Http://www.YR-IC.com