Keywords: STN LCD, LCD contrast, triple-output regulated LCD supply, dual boost converter, step-up converter. DC-DC converter
-LCD Out = -LCDR + VM + VDIODE
+LCD Out = LCDR + VM - VDIODEThese load equations show that -LCD Out and +LCD Out track each other with respect to LCDR, and are offset by VM less one diode drop. The Schottky diodes D1-D5 can be MBR0530 or EP10QY03 types. C2-C3 can be 1µF, preferably with voltage ratings of at least 2LCDR. Typical L1–L2 values are 10µH each, and the output capacitors (C4–C6, shown as 10µF) may be sized according to the allowable output ripple.
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APPLICATION NOTE 1864,AN1864, AN 1864, APP1864, Appnote1864, Appnote 1864
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