SCI7661 データシートの表示（PDF） - Seiko Epson Corp

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SCI7661

DC-DC Converter

Seiko Epson Corp 

SCI7661COA/MOA

0.30

0.25

0.20

0.15

VOUT=

-5V

VOUT=

-10V

0.10

0.05

VOUT=

-15V

0.00

0

5

10 15

20

IOUT(mA)

Fig:13 Regulated Output Saturation

Resistance(RSAT)Vreg—VOUT —IOUT

50

0

-50

-50

0

50

Ta(°C)

CT:

-0.1%/°C

CT:

-0.4%/°C

100

CT:

-0.6%/°C

Fig:14 Output Voltage(vreg)vs.

Temperature(Ta)

s CIRCUIT DESCRIPTION

q C-R Oscillator

The SCI7661C/M contains a C-R oscillator for internal

oscillation. It consists of an external resistor ROSC

connected between the OSC1 pin and OSC2 pin.

Osc1

Osc2

ROSC

C-R Oscillation

Osc1

External Clock

Osc2

Open

External Clock Operation

q Voltage Converters

The voltage converters doubleÅ^triple the input supply voltage (VIN) using clocks generated by the C-R oscillator

VCC

(+5V)

GND

(-5V)

VDD=0V

VIN=-5V

CAP2=2VIN=-10V

Typical Doubled Voltage Relations

VDD=0V

VIN=-5V

VOUT=3VIN=-15V

Typical Tripled Voltage Relations

qReference Voltage Generator and Voltage Regulator

The reference voltage generator produces reference

voltage needed for operation of regulator circuit. The

VDD

voltage regulator is used to regulate a boosted output

Poff

voltage and its circuit contains a power-off function which

RV

Control signal

RRV = 100kΩ to 1MΩ

uses signals from the system for on-off control of the

Vreg output.

Vreg

Voltage Regulator

q Temperature Gradient Selector Circut

The SCI7661C/M provides the Vreg output with a temperature gradient suitable for LCD driving.

5

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