SCI7631MKA Просмотр технического описания (PDF) - Seiko Epson Corp

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SCI7631MKA

POWER SUPPLY IC - DC/DC Switching Regulators

Seiko Epson Corp 

SCI7630 Series

Output voltage adjustment

To ensure stable output, any circuit that adjusts the out-

put voltage must contain C1, RA and RB. To stop

switching current from affecting VO, the circuit must

also satisfy the condition IO < IR.

VSW

VI

VO

SCI7631M/C

GND

Step-up

voltage

output

RA

IO

IR

CL

C RB

(IO < IR)

Voltage adjustment

circuit

The following figure summarizes the relevant circuits

inside an SCI7000 series chip.

VO is connected to the level shift and buffer circuit,

which provide the gate bias for the switching transistor

driving the inductor. The current drain IO1, varies with

the load and is typically 10µA. The current, IO2,

through the internal resistors R1 and R2 is typically

1µA.

VI

VSW

IO1

IO

VO

IO2

Comparator

R1

Buffer

Level

shifter

Controller

VREF R2

4–32

EPSON

SCI7000 Series

Technical Manual

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