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TDA2009 датащи(PDF) 9 Page - STMicroelectronics |
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TDA2009 датащи(HTML) 9 Page - STMicroelectronics |
9 / 12 page Figure 17 : P.C. BOARD and Components Layout of the Circuit of Figure 16 (1:1 scale) APPLICATION SUGGESTION The recommended values of the components are those shown on application circuit of fig. 1. Different values can be used ; the following table can help the designer. Component Recommended Value Purpose Larger than Smaller than R1, R3 1.2k Ω Close Loop Gain Setting (1) Increase of Gain Decrease of Gain R2, R4 18k Ω Decrease of Gain Increase of Gain R5, R6 1 Ω Frequency Stability Danger of Oscillation at High Frequency with Inductive Load C1, C2 2.2 µF Input DC Decoupling High Turn-on Delay High Turn-on Pop. Higher Low Frequency Cut-off. Increase of Noise C3 22 µF Ripple Rejection Better SVR. Increase of the Switch-on Time Degradation of SVR C6, C7 220 µF Feedback Input DC Decoupling C8, C9 0.1 µF Frenquency Stability Danger of Oscillation C10, C11 1000 µFto 2200 µF Output DC Decoupling Higher Low-frequency Cut-off (1) The closed loop gain must be higher than 26dB. The presence of a thermal limiting circuit offers the following advantages: 1) an averload on the output (even if it is pe r m an e nt ) , o r an e xce ssi ve a mb ien t temperature can be easily withstood. 2) the heatsink can have a smaller factor of safety compared with that of a conventional circuit. There is no device damage in the case of excessive junction temperature : all that happens is that Po (and therefore Ptot) and Io are reduced. The maximum allowable power dissipation de- pends upon the size of the external heatsink (i.e. its thermal resistance); Figure 18 shows this dissi- pable power as a function of ambient temperature for different thermal resistance. Short circuit (AC Conditions). The TDA2009A can withstand an accidentalshort circuit from the output and ground made by a wrong connection during normal play operation. BUILD-IN PROTECTION SYSTEMS THERMAL SHUT-DOWN TDA2009A 9/12 |
Аналогичный номер детали - TDA2009 |
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Аналогичное описание - TDA2009 |
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