S-8540A18FN-IADT2G datasheet(20/36 Pages) SII

Part #	S-8540A18FN-IADT2G

Description	STEP-DOWN, 600 kHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER

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Manufacturer	SII [Seiko Instruments Inc]

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20 / 36 page

STEP-DOWN, 600 kHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER

S-8540/8541 Series

Rev.3.2_00

20

Seiko Instruments Inc.

Application Circuits

1.

External adjustment of output voltage

The output voltage can be adjusted or changed in the output voltage setting range (1.5 to 6.0 V) by

adding

external resistors (RA, RB) and a capacitor (CFB) in the S-8540/8541B00AFN and S-

8540/8541D00AFN, as shown in Figure 15.

Temperature gradient can be given by inserting a

thermistor in series to RA and RB.

L

SD

R

SEN SE

Tr

VIN

CIN

SENSE

+

−

VREF=1.0 V

125m V

VIN

EXT

+

−

+

−

COUT

VSS

VOUT

CFB

RB

RA

FB

PW M, PW M/PFM

switching control

circuit

Shu tdo wn

s of t start

circuit

Error amplifier

PWM comparator

T riangular wave

oscillation cir cuit

Phase

comp ensation

circuit

Power for IC

Voltage/ current

referenc e

CVREF

V

ON/OFF

One point ground

Figure 15

Caution

The above connection diagram and constant will not guarantees successful operation.

Perform through evaluation using the actual application to set the constant.

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S-8540A18FN-IADT2G Datasheet(PDF) 20 Page - Seiko Instruments Inc

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