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TDA8542TS Datasheet(PDF) 8 Page - NXP Semiconductors |
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TDA8542TS Datasheet(HTML) 8 Page - NXP Semiconductors |
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8 / 20 page  1998 Mar 25 8 Philips Semiconductors Product specification 2 × 0.7 W BTL audio amplifier TDA8542TS 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 = 110 K/W for the SSOP20; the maximum sine wave power dissipation for Tamb =25 °C is: For Tamb =60 °C the maximum total power dissipation is: Thermal design considerations 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 (yet) standardized. Also, 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 SSOP package has improved thermal conductivity which reduces the thermal resistance. Using a practical PCB layout (see Fig.22) with wider copper tracks to the corner pins and just under the IC, the thermal resistance from junction to ambient can be reduced to approximately 80 K/W. For Tamb =60 °C the maximum total power dissipation for this PCB layout 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 diagram is illustrated in Fig.3. The quiescent current has been measured without any load impedance. The total harmonic distortion as a 150 25 – 110 ---------------------- 1.14 W = 150 60 – 110 ---------------------- 0.82 W = 150 60 – 80 ---------------------- 1.12 W = function of frequency was measured with 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 select voltage (Vms) 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 depends on the supply voltage level. 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 diagram is illustrated in Fig.14. If the BTL/SE pin (pin 6) is connected to ground, the positive outputs (pins 3 and 8) will be in mute condition with a DC level of 1 ⁄2VCC. When a headphone is used (RL ≥ 25 Ω) the SE headphone application can be used without output coupling capacitors; load between negative output and one of the positive outputs (e.g. pin 3) as common pin. The channel separation will be less in comparison with the application using a coupling capacitor connected to ground. 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 C4/C5 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 of 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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