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TDA8153 Datasheet(PDF) 10 Page - STMicroelectronics |
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TDA8153 Datasheet(HTML) 10 Page - STMicroelectronics |
10 / 11 page Power Dissipation Taking as reference the IC internal schematic dia- gram we can calculate the power dissipated by the video amplifiers. The power dissipation of the IC is defined by a static an a dynamic part. The statically dissipated power is given by : PS = 3Vht Vht − Vobl R1 + Vobl Rf − 3 Vobl 2 Rf − 3 (Vref + 2Vbe)2 Rb Where Rf is the feedback resistance and Rb the input to ground resistance with a black level Vobl = 150V, Vht = 200V, Rf = 68k Ω and Rb = 1.8kΩ we have : PS = 1.75W The dynamic power dissipation has been calcu- lated with a 5MHz, 80Vpp sinusoidal output signal and a load capacitor CL = 10pF with the following expression : Pd = 0.8 Vht (2f CL Vop ) − 0.8 Vop 2 2Rf = 1.90W The value is reduced by 20% (0.8 factor) because during the flyback time there is not signal. The total power dissipated by the IC is therefore : PT =PS +Pd = 1.75 + 1.90 = 3.65W One of the worst working condition of the TV set as regards the power dissipation, is when you get white noise on the screen, for example, when you disconnect the TV aerial or the channels are not properly tuned. In these cases if we set the TV receiver for 80VPP white noise output signal with a black level Vob1 = 125V, the total power dissipated by the IC can be measured. It results about PT = 4.8W. With a maximum ambient temperature of 70 °Cand a junction temperature of 150 °Ca 15°C/W heatsink is required. Figure 4 : Maximum Allowable Power Dissipation versus Ambient Temperature Figure 5 : Mounting Examples TDA8153 10/11 |
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