S8540 datasheet(20/36 Pages) SII

Part #	S8540

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

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Manufacturer	SII [Seiko Instruments Inc]

Direct Link	http://www.sii.co.jp

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

S-8540/8541 Series

Rev.4.0_01

20



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

RSENSE

Tr

VIN

CIN

SENSE

+

−

VREF=1.0 V

125mV

VIN

EXT

+

−

+

−

COUT

VSS

VOUT

CFB

RB

RA

FB

PWM, PWM/PFM

switching control

circuit

Shutdown soft start

circuit

Error amplifier

PWM comparator

Triangular wave

oscillation circuit

Phase

compensation

circuit

Power for IC

Voltage/current

reference

CVREF

VON/OFF

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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S8540 Datasheet(PDF) 20 Page - Seiko Instruments Inc

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