S8540 datasheet(18/36 Pages) SII

Part #	S8540

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

PDF	36 Pages

Scroll/Zoom	100%

Manufacturer	SII [Seiko Instruments Inc]

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

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18 / 36 page

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

S-8540/8541 Series

Rev.4.0_01



Standard Circuits

1. Fixed output voltage (Pch MOS FET)

−

RSENSE

VIN

CIN

SENSE

VREF

=1.0 V

PWM, PWM/PFM

switching control

circuit

Shutdown soft start

circuit

125mV

Error amplifier

PWM comparator

Triangular wave

oscillation circuit

Phase

compensation

circuit

Power for IC

VIN

EXT

COUT

VSS

VOUT

CVREF

VON/OFF

ON/OFF

One point ground

Voltage/current

reference

Figure 13

2. Feed back type (Pch MOS FET)

RSENSE

VIN

CIN

SENSE

−

VREF=1.0 V

125mV

VIN

EXT

−

COUT

VSS

VOUT

CFB

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 14

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

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

S8540 Datasheet(PDF) 18 Page - Seiko Instruments Inc

S8540 Datasheet(HTML) 18 Page - Seiko Instruments Inc

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