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TDA8551T Scheda tecnica(PDF) 8 Page - NXP Semiconductors |
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TDA8551T Scheda tecnica(HTML) 8 Page - NXP Semiconductors |
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8 / 20 page  1998 Feb 23 8 Philips Semiconductors Product specification 1 W BTL audio amplifier with digital volume control TDA8551 TEST AND APPLICATION INFORMATION Fig.4 Test and application circuit. handbook, full pagewidth MGM560 20 k Ω TDA8551 5 k Ω 8 Ω 15 k Ω 15 k Ω C2 100 µF C4 220 µF C1 330 nF C5 100 nF C3 100 nF 2.2 k Ω R1 STANDBY/ MUTE/ OPERATING VOLUME CONTROL 27 R R 8 5 3 operating standby VP mute UP DOWN volume control 1 6 4 VP VP VP = 5 V VP Vi SLAVE MASTER OUT + GND MODE OUT − IN SVR UP/DOWN Reduction of the value of capacitor C2 results in a decrease of the SVRR performance at low frequencies (see Fig.9). The UP/DOWN pin can be driven by a 3-state logic output stage (microcontroller) without extra external components. If the UP/DOWN pin is driven by push-buttons, then it is advised to have an RC filter between the buttons and the UP/DOWN pin. Advised values for the RC filter are 2.2 k Ω and 100 nF. The volume control circuit responds to the trailing edge of the pulse on the volume pin; connecting to VP results in a one step (1.25 dB) higher gain; connecting to ground results in a one step lower gain. To avoid audible plops while switching the supply voltage on and off pin MODE has to be connected to VP (standby condition) during charge or discharge of the input and SVRR capacitors. The measured thermal resistance of the IC package is highly dependent on the configuration and size of the application board. Data may not be comparable between different semiconductor manufacturers because the application boards and test methods are not standardized yet. In addition, the thermal performance of packages for a specific application may be different than presented here, because the configuration of the application boards (copper area) may be different. Philips Semiconductors uses FR-4 type application boards with 1 oz. copper traces with solder coating. The measurements have been carried out with vertical placed boards. |
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