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M5481 Fiches technique(PDF) 5 Page - STMicroelectronics |
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M5481 Fiches technique(HTML) 5 Page - STMicroelectronics |
5 / 8 page M5481 5/8 5 - TYPICAL APPLICATION BASIC electronically tuned TV system. 6 - POWER DISSIPATION OF THE IC The power dissipation of the IC can be limited us- ing different configurations. In this application R must be chosen by taking into account the worst operating conditions. R is determined by the maximum number of seg- ments activated. The worst case condition for the device is when roughly half of the maximum number of segments are activated. It must be checked that the total power dissipation does not exceed the absolute maximum ratings of the device. In critical cases more resistors can be used in con- junction with groups of segments. In this case the current variation in the single resistor is reduced and Ptot limited. 14 SEGMENTS M5481 DISPLAY DRIVER PROCESSOR KEYBOARD PLL SYNTHESIZER LED DISPLAY VD VOUT R ID +V C R V C V DM AX – V OM IN – N MAX xI D ---------------------------------------------------------------- = |
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