S1335 datasheet(37/67 Pages) SII

37 / 67 page

HIGH RIPPLE-REJECTION SOFT-START FUNCTION CMOS VOLTAGE REGULATOR

Rev.1.3_00

S-1335 Series

Seiko Instruments Inc.

8. 2. 2 When SST pin voltage (VSST) is switched from "L" to "H"

The soft-start time (tSS) is calculated by using the following equation.

tSS = tSS1'

+ tSS0 × {1 − VOUT(E)' / (VOUT(E) × 0.99)}

tSS1': The time period that VSST is switched from "L" to "H" after power-on

tSS0: The soft-start time when VSST = "H"

VOUT(E)': The output voltage when VSST is switched from "L" to "H"

VOUT(E): The output voltage after the end of the soft-start time

Input voltage

(VIN)

SST pin voltage

(VSST)

Output voltage

(VOUT)

VOUT(E)

× 0.99

Soft-start time (tSS)

VOUT(S)

+ 1.0 V

VIN

× 0.50

tSS1'

VOUT(E)'

VOUT(E)

VSH2

tr = 1.0

μs

Figure 35 VSST = "L"

→ "H"

Input voltage

(VIN)

SST pin voltage

(VSST)

Output voltage

(VOUT)

Soft-start time (tSS0)

VOUT(S)

+ 1.0 V

VIN

× 0.50

VOUT(E)

tr = 1.0

μs

Figure 36 VSST = "H"

S1335 Datasheet(PDF) 37 Page - Seiko Instruments Inc

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