S-8363 Просмотр технического описания (PDF) - Seiko Instruments Inc

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S-8363

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

Seiko Instruments Inc 

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 ON / OFF pin voltage to “L”. Setting ON / 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.

VOUT(S)

Output voltage(VOUT)

STU release

STU detection

0V

Reference

voltage from

error amplifier 0 V

Load current

(IOUT)

0A

ON/OFF

voltage

0V

<4> <1>

<2>

<3> <4> <1>

<2>

<3>

<1> Start-up period

<2> Soft-start period

<3> Normal operation period

<4> Reset period

Figure 12 Reset Condition for Soft-Start

<1>

<2>

Time [s]

13

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