Os motores de busca de Datasheet de Componentes eletrônicos |
|
TPA2000D2PWRG4 Folha de dados(PDF) 10 Page - Texas Instruments |
|
|
TPA2000D2PWRG4 Folha de dados(HTML) 10 Page - Texas Instruments |
10 / 20 page www.ti.com 0 V –5 V +5 V Current OUT+ OUT– Differential Voltage Across Load 0 V –5 V +5 V Current OUT+ OUT– Differential Voltage Across Load Output = 0 V Output > 0 V EFFICIENCY: WHY YOU MUST USE A FILTER WITH THE TRADITIONAL CLASS-D EFFECTS OF APPLYING A SQUARE WAVE INTO A SPEAKER TPA2000D2 SLOS291F – MARCH 2000 – REVISED MARCH 2007 APPLICATION INFORMATION (continued) Figure 13. The TPA2000D2 Output Voltage and Current Waveforms Into an Inductive Load MODULATION SCHEME The main reason that the traditional class-D amplifier needs an output filter is that the switching waveform results in maximum current flow. This causes more loss in the load, which causes lower efficiency. The ripple current is large for the traditional modulation scheme because the ripple current is proportional to voltage multiplied by the time at that voltage. The differential voltage swing is 2 × VDD and the time at each voltage is half the period for the traditional modulation scheme. An ideal LC filter is needed to store the ripple current from each half cycle for the next half cycle, while any resistance causes power dissipation. The speaker is both resistive and reactive, whereas an LC filter is almost purely reactive. The TPA2000D2 modulation scheme has very little loss in the load without a filter because the pulses are very short and the change in voltage is VDD instead of 2 × VDD. As the output power increases, the pulses widen making the ripple current larger. Ripple current could be filtered with an LC filter for increased efficiency, but for most applications the filter is not needed. An LC filter with a cutoff frequency less than the class-D switching frequency allows the switching current to flow through the filter instead of the load. The filter has less resistance than the speaker, which results in less power dissipated and increased efficiency. Audio specialists have said for years not to apply a square wave to speakers. If the amplitude of the waveform is high enough and the frequency of the square wave is within the bandwidth of the speaker, the square wave could cause the voice coil to jump out of the air gap and/or scar the voice coil. A 250-kHz switching frequency, however, is not significant because the speaker cone movement is proportional to 1/f2 for frequencies beyond the audio band. Therefore, the amount of cone movement at the switching frequency is very small. However, 10 Submit Documentation Feedback |
Nº de peça semelhante - TPA2000D2PWRG4 |
|
Descrição semelhante - TPA2000D2PWRG4 |
|
|
Ligação URL |
Privacy Policy |
ALLDATASHEETPT.COM |
ALLDATASHEET é útil para você? [ DONATE ] |
Sobre Alldatasheet | Publicidade | Contato conosco | Privacy Policy | roca de Link | Lista de Fabricantes All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |