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TDA8547 Scheda tecnica(PDF) 9 Page - NXP Semiconductors |
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TDA8547 Scheda tecnica(HTML) 9 Page - NXP Semiconductors |
9 / 24 page 1997 Oct 07 9 Philips Semiconductors Preliminary specification 2 × 1 W BTL audio amplifier with output channel switching TDA8547 TEST AND APPLICATION INFORMATION Test conditions Because the application can be either Bridge-Tied Load (BTL) or Single-Ended (SE), the curves of each application are shown separately. The thermal resistance = 55 K/W for the DIP16; the maximum sine wave power dissipation for Tamb =25 °C is: For Tamb =60 °C the maximum total power dissipation is: BTL application Tamb =25 °C if not specially mentioned, VCC =5V, f = 1 kHz, RL =8 Ω, Gv = 20 dB, audio band-pass 22 Hz to 22 kHz. The BTL application circuit is illustrated in Fig.4. The quiescent current has been measured without any load impedance and both channels driven. When one channel is active the quiescent current will be halved. The total harmonic distortion as a function of frequency was measured using a low-pass filter of 80 kHz. The value of capacitor C3 influences the behaviour of the SVRR at low frequencies: increasing the value of C3 increases the performance of the SVRR. The figure of the MODE voltage (VMODE) as a function of the supply voltage shows three areas; operating, mute and standby. It shows, that the DC-switching levels of the mute and standby respectively depend on the supply voltage level. The figure of the SELECT voltage (VSELECT) as a function of the supply voltage shows the voltage levels for switching the channels in the active, mute or standby mode. 150 25 – 55 ---------------------- 2.3 W = 150 60 – 55 ---------------------- 1.7 W = SE application Tamb =25 °C if not specially mentioned, VCC = 7.5 V, f = 1 kHz, RL =4 Ω, Gv = 20 dB, audio band-pass 22 Hz to 22 kHz. The SE application circuit is illustrated in Fig.16. Increasing the value of electrolytic capacitor C3 will result in a better channel separation. Because the positive output is not designed for high output current (2 × Io) at low load impedance ( ≤16 Ω), the SE application with output capacitors connected to ground is advised. The capacitor value of C6/C7 in combination with the load impedance determines the low frequency behaviour. The THD as a function of frequency was measured using a low-pass filter of 80 kHz. The value of capacitor C3 influences the behaviour of the SVRR at low frequencies: increasing the value of C3 increases the performance of the SVRR. General remark The frequency characteristic can be adapted by connecting a small capacitor across the feedback resistor. To improve the immunity to HF radiation in radio circuit applications, a small capacitor can be connected in parallel with the feedback resistor (56 k Ω); this creates a low-pass filter. |
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