S-8363B-I6T1U2 Datasheet, PDF (13/50 Pages) Seiko Instruments Inc – PWM/PFM SWITCHABLE SWITCHING REGULATOR

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