CRS08 datasheet(13/50 Pages) SII

Part #	CRS08

Description	STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM / PFM SWITCHABLE SWITCHING REGULATOR

PDF	50 Pages

Scroll/Zoom	100%

Manufacturer	SII [Seiko Instruments Inc]

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

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13 / 50 page

STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM/PFM SWITCHABLE SWITCHING REGULATOR

Rev.2.0_01

S-8363 Series

3. 3 Condition of performing soft-start again

The condition to reset after the reference voltage once rises (reference voltage from error amplifier = 0 V) is to set

the

OFF

pin voltage to “L”. Setting

OFF

= “H” starts soft-start again. When the VOUT voltage drops and

decreases more than the STU detection voltage by an overload, the soft-start circuit shifts to the start-up period.

When the VOUT voltage is restored by releasing overload, the soft-start function is performed.

If the VOUT voltage is not decreased less than the STU detection voltage, the soft-start function is not performed

when restoration.

Reference

voltage from

error amplifier

0 V

Output voltage(VOUT)

ON/OFF

voltage

Time [s]

0 V

STU release

STU detection

<1> Start-up period

<2> Soft-start period

<3> Normal operation period

<4> Reset period

<1>

<2>

<3>

<4>

0 A

Load current

(IOUT)

VOUT(S)

Figure 12 Reset Condition for Soft-Start

CRS08 Datasheet(PDF) 13 Page - Seiko Instruments Inc