S8340 datasheet(2/55 Pages) SII

tên linh kiện	S8340

Giải thích chi tiết về linh kiện	STEP-UP, 600 kHz, PWM CONTROL OR PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER

PDF	55 Pages

Scroll/Zoom	100%

nhà sản xuất	SII [Seiko Instruments Inc]

Trang chủ	http://www.sii.co.jp

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2 / 55 page

STEP-UP, 600 kHz, PWM CONTROL OR PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER

S-8340/8341 Series

Rev.4.0_01



Block Diagrams

(1) S-8340/8341 Series A and C Types (Output Voltage Fixed Output Type)

VSS

VOUT

ON/OFF

VDD

EXT

Shutdown

circuit

VIN

CVREF

CSS

Nch Power

MOS FET

120 mV

RSENSE

SENSE

PWM comparator

Error amplifier

VREF =1.0 V

PWM, PWM/PFM

switching control

circuit

Triangular wave

oscillation circuit

Phase

IC internal power

compensation

Soft-start

circuit

Voltage/current

reference

circuit

supply

Figure 1

(2) S-8340/8341 Series B and D Types (Output Voltage External Setting Type)

RFB2

RFB1

CFB

VSS

VOUT

ON/OFF

VDD

EXT

VIN

CVREF

CSS

Nch Power

MOS FET

120 mV

RSENSE

SENSE

PWM comparator

VREF =1.0 V

Triangular wave

oscillation circuit

Phase

compensation

circuit

IC internal power

supply

Error amplifier

PWM, PWM/PFM

switching control

circuit

Shutdown

circuit

Soft-start

circuit

Voltage/current

reference

Figure 2

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