SCI7630 查看數據表（PDF） - Seiko Epson Corp

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SCI7630

POWER SUPPLY IC - DC/DC Switching Regulators

Seiko Epson Corp 

Timing diagram

VI1

PWCR

SCI7630 Series

Measurement circuit

VO

VO

R

PWCR

C

100 kΩ

RST

RST

tpd

PACKAGE MARKINGS

SCI7631, SCI7638 series device packages use the fol-

lowing markings.

7631

Series number

First subcode character

Second subcode character

Code number

FUNCTIONAL DESCRIPTION

Basic Voltage Booster Operation

TR1 switches ON and OFF at half the frequency of the

clock pulses from the built-in RC oscillator. When the

transistor is ON, the circuit stores energy in L. When it

is off, this energy flows through D to change C.

L

D

VI1

VO

Tr1

C

GND

GND

Internal Circuits

RC oscillator

The SCI7631, SCI7638 series use a built-in RC oscilla-

tor to drive the voltage booster circuit. The circuit is

supplied by VI1. All circuit components are on-chip

and thus the drive frequency is set internally. To ensure

50% duty, this frequency is twice that used by the volt-

age booster circuit.

When PS is LOW, the oscillator is disabled and the chip

is in standby mode.

PS

C

R

SCI7000 Series

Technical Manual

EPSON

4–13

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