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. Soft-start function

The S-8363 Series has the built-in soft-start circuit. When power-on (connecting ON / OFF to VIN) or after

start-up at ON / OFF = “H”, the output voltage (VOUT) gradually rises, suppressing rush current and overshoot of

the output voltage. In the S-8363 Series, the soft-start time (tss) is from start-up to the time to reach 90% of the

VOUT output voltage setting value (VOUT(S)). A reference voltage adjustment method is adopted as the soft-start

method, the reference voltage gradually rises from 0 V simultaneously with start of the soft-start. The soft-start

circuit has two operation modes which is selected according to the VOUT voltage at start-up.

3.1 VOUT voltage at start-up > STU release voltage

The soft-start starts when the reference voltage gradually rises after ON / OFF = “H”.

Input voltage

(VIN)

0V

Soft-start time (tss)

STU release

Output voltage

(VOUT)

0V

Reference voltage

from

error amplifier 0 V

ON/OFF

voltage 0 V

Soft-start period

VOUT × 0.90

Figure 10

Time [s]

11

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