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EL5225 Datasheet(PDF) 10 Page - Intersil Corporation |
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EL5225 Datasheet(HTML) 10 Page - Intersil Corporation |
10 / 12 page 10 FN7356.0 March 11, 2004 The maximum power dissipation actually produced by the IC is the total quiescent supply current times the total power supply voltage and plus the power in the IC due to the loads. when sourcing, and: when sinking. Where: • i = 1 to total 10 •VS = Supply voltage •IS = Quiescent current •VOUTi = Output voltage of the i channel •ILOADi = Load current of the i channel By setting the two PDMAX equations equal to each other, we can solve for the RLOADs to avoid the device overheat. The package power dissipation curves provide a convenient way to see if the device will overheat. POWER SUPPLY BYPASSING AND PRINTED CIRCUIT BOARD LAYOUT Good printed circuit board layout is necessary for optimum performance. A low impedance and clean analog ground plane should be used for the EL5225. The traces from the two ground pins to the ground plane must be very short. Lead length should be as short as possible and all power supply pins must be well bypassed. A 0.1µF ceramic capacitor must be place very close to the VS, VREFH, VREFL, and CAP pins. A 4.7µF local bypass tantalum capacitor should be placed to the VS, VREFH, and VREFL pins. APPLICATION USING THE EL5225 In the first application drawing, the schematic shows the interconnect of a pair of EL5225 chips connected to give 10 gamma corrected voltages above the VCOM voltage, and 10 gamma corrected voltages below the VCOM voltage. PDMAX VS IS Σ VS ( - VOUTi) ILOADi × [] + × = PDMAX VS IS Σ VOUTiILOADi × () + × = EL5225 |
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