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MAX4367 Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX4367 Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 18 page Maximum Ratings section. For example, ΘJA of a µMAX package is 222°C/W. The increase in power delivered by the BTL configura- tion directly results in an increase in internal power dis- sipation over the single-ended configuration. If the power dissipation exceeds the maximum allowed for a given package, either reduce VCC, increase load impedance, decrease the ambient temperature, or add heat sinking to the device. Large output, supply, and ground traces improve the maximum power dissipation in the package. Thermal overload protection limits total power dissipa- tion in the MAX4366/MAX4367/MAX4368. When the junction temperature exceeds +165°C, the thermal pro- tection circuitry disables the amplifier output stage. The amplifiers are re-enabled once the junction temperature cools by +10°C. This results in a pulsing output under continuous thermal overload conditions avoiding dam- age to the port. Component Selection Gain-Setting Resistors External feedback components set the gain of the MAX4366. Resistors RF and RIN (Figure 3) set the gain of the input amplifier as follows: The gain of the device in a single-ended configuration is half the gain of the BTL case. Choose RF between 10k Ω and 50kΩ. The gains of the MAX4367/MAX4368 are set internally (Figure 4). Input Filter The input capacitor (CIN), in conjunction with RIN forms a highpass filter that removes the DC bias from an incoming signal. The AC-coupling capacitor allows the amplifier to bias the signal to an optimum DC level. Assuming zero source impedance, the -3dB point of the highpass filter is given by: ƒ= -3 1 2 dB IN IN RC π A R R VD F IN = 2 330mW, Ultra-Small, Audio Power Amplifiers with Shutdown ______________________________________________________________________________________ 11 Figure 4. MAX4367/MAX4368 Typical Application Circuit VCC VCC CIN RIN RF CBIAS 6 OUT- IN+ BIAS AUDIO INPUT 3 2 CLICKLESS/ POPLESS SHUTDOWN CONTROL GND SHDN 8 OUT+ 5 7 1 MAX4367 MAX4368 50k Ω 50k Ω 10k Ω 10k Ω IN- 4 MAX4367: RIN = RF = 20k Ω MAX4368: RIN = 20k Ω, RF = 30kΩ PIN NUMBERS REFER TO SOT23, QFN, AND µMAX PACKAGES |
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