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ML9058E Datasheet(PDF) 32 Page - LAPIS Semiconductor Co., Ltd. |
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ML9058E Datasheet(HTML) 32 Page - LAPIS Semiconductor Co., Ltd. |
32 / 76 page FEDL9058E-01 LAPIS Semiconductor ML9058E 32/76 The voltage relationships in voltage multiplication are shown in Fig. 8. VOUT = 3 VIN = 15.0 V *1 VIN = 5.0 V VSS = 0 V VOUT = 4 V IN = 18 V *1 VIN = 4.5 V VSS = 0 V Voltage relationship in 3-time multiplication Voltage relationship in 4-time multiplication Fig. 8 Voltage relationships in voltage multiplication *1: The voltage range of VIN should be set from 6V to 18.33V so that the voltage at the pin VOUT does not exceed the voltage multiplier output voltage operating range. Voltage adjustment circuit The voltage multiplier output VOUT produces the LCD drive voltage V1 via the voltage adjustment circuit. Since the ML9058E incorporates a high accuracy constant voltage generator, a 64-level electronic potentiometer function, and also resistors for voltage V1 adjustment, it is possible to build a high accuracy voltage adjustment circuit with very few components. In addition, the ML9058E is available with the temperature gradients of a VREG - about –0.05%/°C. (a) When the internal resistors for voltage V1 adjustment are used It is possible to control the LCD power supply voltage V1 and adjust the intensity of LCD display using commands and without needing any external resistors, if the internal voltage V1 adjustment resistors and the electronic potentiometer function are used. The voltage V1 can be obtained by the following equation A-1 in the range of V1<VOUT. V1 = (1 + (Rb/Ra)) VEV = (1 + (Rb/Ra)) (1 – (/324)) VREG (Eqn. A-1) Fig. 9 V1 voltage adjustment circuit (equivalent circuit) – + V1 Internal Ra Internal Rb VEV (Constant voltage supply + electronic potentiometer) VRS (VREG) VR |
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