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TDA8950J Datasheet(PDF) 9 Page - NXP Semiconductors |
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TDA8950J Datasheet(HTML) 9 Page - NXP Semiconductors |
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9 / 39 page  TDA8950_1 © NXP B.V. 2008. All rights reserved. Preliminary data sheet Rev. 01 — 9 September 2008 9 of 39 NXP Semiconductors TDA8950 2 × 150 W class-D power amplifier TFB is specified at the temperature value Tact(th_fold) where the closed loop voltage gain is reduced with 6 dB. The range of the TFB is: Tact(th_fold) − 5 °C < Tact(th_fold) < Tact(th_prot). For the TDA8950 the value of Tact(th_fold) is about +153 °C. For more details see: Table 7. 8.3.1.2 OverTemperature Protection (OTP) If, despite the TFB function, the junction temperature Tj of the TDA8950 continues rising and exceeds the threshold Tact(th_prot) the amplifier will shutdown immediately. The amplifier resumes switching approximately 100 ms after the temperature drops below Tact(th_prot). In Figure 6 the thermal behavior is visualized. 8.3.2 OverCurrent Protection (OCP) If a short-circuit is applied to one of the demodulated outputs of the amplifier, the OCP will detect this. If the output current exceeds the maximum of 9.2 A, it is automatically limited to its maximum value by the OCP protection circuit. The amplifier outputs remain switching (the amplifier is NOT shut-down completely). If the active current limiting continues longer than time τ, the TDA8950 shuts down. Activation of current limiting and the triggering of the OCP are observed at pin PROT. The amplifier can distinguish between an impedance drop of the loudspeaker and a low-ohmic short-circuit across the load. In the TDA8950 the impedance threshold (Zth) depends on the supply voltage used. When a short-circuit is made across the load, causing the impedance to drop below the threshold level (<Zth), the amplifier is switched off completely and, after a time of 100 ms, it will try to restart. If the short-circuit condition is still present after this time, the cycle will be repeated. The average dissipation will be low because of this low duty cycle. (1) Duty cycle of PWM output modulated according audio input signal. (2) Duty cycle of PWM output reduced due to TFB. (3) Amplifier is switched off due to OTP. Fig 6. Behavior of TFB and OTP 001aah656 (Tact(th_fold) − 5°C) Tact(th_fold) Tj (°C) Tact(th_prot) Gain (dB) 30 dB 24 dB 0 dB 12 3 |
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