LCD－contrast_supply_for_color_displays

Published:2009/7/24 5:32:00 Author:Jessie | From:SeekIC

Figure 8-46 shows a MAX641 connected as an LCD-contrast supply with positive26-V to 38-V output (primarily for color displays). Figure 8-47 shows the efficiencycurves．The circuit operates over a 4.5-V to 15-V(five-to eight-cell)range, draws550 μA (with 5-V in and 26-V output) or 1-mA (with 9.6-V input and 38-V output) quiescent current and is capable of 30-mA output，Load regulation is 0.16%/mA, line regulation is 0.16%/V output. and output noise is 200 mV p-p．The input range makesthe circuit suitable for＋5 -V regulated input or for a direct-battery connection. For input voltages above 7 V substitute a 100-μH inductor (Coiltronix CTS100-4) to maintain low output nolse and ripple．MAXIM BATTERY MANAGEMENT CIRCUITCOLLECTION. 1994 P.50．



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