STR7003 datasheet(4/5 Pages) SANKEN

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sStandard External Circuit

sNotes of Pattern Design

1) Thick lines in the Standard External Circuit are lines through which a large current flows. Make these pattern lines as thick as possible.

2) Place capacitor C1 on the input side as closely as possible to terminals no.2 and no.4 of the STR7000/7100 series. C1 may be used in

combination with a smoothing capacitor for rectifying, but the above points must be taken into consideration. In cases where C1 is not provided

or it is placed too far from the terminals stated above, abnormal oscillation due to poorer transient response or increased ringing may occur.

3) Connect voltage sensing terminal VO.S and GND as closely as possible to output capacitor C4 (a current of approximately 1mA flows into the

VO.S terminal). If they are placed too far from C4, abnormal oscillation due to decreased regulation or increased switching ripple may occur.

4) Connect current sensing terminal C.S and GND as closely as possible to the detection resistor Rs (a current of approximately 0.5mA flows

from the CS terminal).

If they are placed too far from Rs, a decrease of the overcurrent setting point due to the voltage drop in the pattern, or malfunction of the

protection circuit due to increased ringing may occur.

sTa-PD Characteristics

STR7000 Series

STR7100 Series

VIN

C5 330P

330p

µF

2200

µF

1500

µF × 2 (parallel)

GND

*C5 STR7100 Series only

VIN

GND

F/W

DRIVE

STR7000

STR7100

SERIES

VIN

VO.S

VO. ADJ

OSC. OUT

SHUT DOWN

VREF

C.S

C.A

C.B

GND

DRIVE

6A ... 0.02

Ω

12A ... 0.01

Ω

5V ... 200

µH

12V ...

250

µH

15V

24V ... 300

µH

SI-8020

SERIES

–20

100

125

Ambient Temperature Ta (

°C)

200

×300×2

200

×200×2

100

×200×2

100

×100×2

×75×2

Without heatsink

Without Mica

With Silicon Grease

Heatsink: Aluminum

Unit: mm

–20

100

125

Ambient Temperature Ta (

°C)

200

×300×2

200

×200×2

100

×200×2

100

×100×2

×75×2

Without heatsink

Without Mica

With Silicon Grease

Heatsink: Aluminum

Unit: mm

qSTR7000+SI-8020 Series

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