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TDA8950J Scheda tecnica(PDF) 11 Page - NXP Semiconductors |
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TDA8950J Scheda tecnica(HTML) 11 Page - NXP Semiconductors |
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11 / 39 page  TDA8950_1 © NXP B.V. 2008. All rights reserved. Preliminary data sheet Rev. 01 — 9 September 2008 11 of 39 NXP Semiconductors TDA8950 2 × 150 W class-D power amplifier [1] Amplifier gain will depend on junction temperature and heatsink size. [2] Only complete shutdown of amplifier if short-circuit impedance is below threshold of 1 Ω. In all other cases current limiting results in clipping of the output signal. [3] Fault condition detected during (every) transition between standby-to-mute and during restart after activation of OCP (short-circuit to one of the supply lines). 8.4 Differential audio inputs For a high common mode rejection ratio and a maximum of flexibility in the application, the audio inputs are fully differential. There are two possibilities: • For stereo operation it is advised to use the inputs in anti phase and also to connect the speakers in anti phase (to avoid acoustical phase differences). This construction has several advantages: – The peak current in the power supply is minimized – The supply pumping effect is minimized, especially at low audio frequencies • For mono BTL operation it is required that the inputs are connected in anti parallel. The output of one of the channels is inverted and the speaker load is now connected between the two outputs of the TDA8950. In principle the output power to the speaker can be significantly boosted to two times the output power in single ended stereo. The input configuration for a mono BTL application is illustrated in Figure 7. Table 4. Overview of TDA8950 protections Protection name Complete shutdown Restart directly Restart after 100 ms Pin PROT detection TFB[1] NNNN OTP Y N Y N OCP Y[2] N[2] Y[2] Y WP N[3] YN N UVP YN YN OVP Y N Y N UBP YN YN Fig 7. Input configuration for mono BTL application Vin IN1P OUT1 power stage mbl466 OUT2 SGND IN1M IN2P IN2M |
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