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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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TDA8950J-N1112 Datenblatt(PDF) 10 Page - NXP Semiconductors |
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TDA8950J-N1112 Datenblatt(HTML) 10 Page - NXP Semiconductors |
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10 / 39 page  TDA8950_2 © NXP B.V. 2009. All rights reserved. Product data sheet Rev. 02 — 11 June 2009 10 of 39 NXP Semiconductors TDA8950 2 × 150 W class-D power amplifier When OCP is activated, the power transistors are turned off. They are turned on again during the next switching cycle. If the output current is still greater than the OCP threshold, they will be immediately switched off again. This switching will continue until CPROT is fully discharged. The amplifier will then be switched off completely and a restart sequence initiated. After a fixed period of 100 ms, the amplifier will attempt to switch on again, but will fail if the output current still exceeds the OCP threshold. The amplifier will continue trying to switch on every 100 ms. The average power dissipation will be low in this situation because the duty cycle is low. Switching the amplifier on and off in this way will generate unwanted ‘audio holes’. This can be avoided by increasing the value of CPROT (up to 220 pF) to delay amplifier switch-off. CPROT will also prevent the amplifier switching off due to transient frequency-dependent impedance drops at the speakers. The amplifier will switch on, and remain in Operating mode, once the overcurrent condition has been removed. OCP ensures the TDA8950 amplifier is fully protected against short-circuit conditions while avoiding audio holes. [1] VP is the supply voltage on pins VDDP1, VDDP2 and VDDA. [2] OVP can be triggered by supply pumping; see Section 13.6. 8.3.3 Window Protection (WP) Window Protection (WP) checks the conditions at the output terminals of the power stage and is activated: • During the start-up sequence, when the TDA8950 is switching from Standby to Mute. Start-up will be interrupted If a short-circuit is detected between one of the output terminals and pin VDDP1/VDDP2 or VSSP1/VSSP2. The TDA8950 will wait until the short-circuit to the supply lines has been removed before resuming start-up. The short circuit will not generate large currents because the short-circuit check is carried out before the power stages are enabled. • When the amplifier is shut down completely because the OCP circuit has detected a short circuit to one of the supply lines. WP will be activated when the amplifier attempts to restart after 100 ms (see Section 8.3.2). The amplifier will not start-up again until the short circuit to the supply lines has been removed. Table 4. Current limiting behavior during low output impedance conditions at different values of CPROT Type VP[1] (V) VI (mV, p-p) f (Hz) CPROT (pF) PWM output stops Short (Zth =0 Ω) Short (Zth = 0.5 Ω) Short (Zth =1 Ω) TDA8950 29.5 500 20 10 yes yes OVP[2] 1000 10 yes yes no 20 15 yes yes OVP[2] 1000 15 yes no no 1000 220 no no no |
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Ähnliche Beschreibung - TDA8950J-N1112 |
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