ML9058E datasheet(32/76 Pages) ETC2

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  VIN

= 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)

–

Internal Ra

Internal Rb

VEV (Constant voltage supply +

electronic potentiometer)

VRS

(VREG)

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