MB3827PFV datasheet(24/41 Pages) FUJITSU

No de pièce	MB3827PFV

Description	6-ch DC/DC Converter IC With Synchronous Rectification for voltage step-up and step-down

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Fabricant	FUJITSU [Fujitsu Component Limited.]

Site Internet	http://edevice.fujitsu.com/fmd/en/index.html

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MB3827

24

(2) Setting Methods

• Channel 7 soft start interval

Before CTL1-4, 7 are ON: Vin is applied along path (A) below and charges CFB7.

After CTL1-4, 7 are ON: Along path (B), CFB7 is discharged by R2, R3, D1 at I1 to 15

µA on a time constant,

and with the fall of V-IN7-1, channel 7 is activated with a soft start.

Note : The short detection function is suspended while VDTC is below 0.6V.

VDTC7

VCT

VFB7

VSS (O)

V

−IN7−1

(V)

CTL1

−4, 7

V

−IN7−1

VSS (O)

1.55 V

0.8 V

0.77 V

0.3 V

t

VFB7

VDTC7

VCT

0.6 V

−

+

100 k

Ω

Error

Amp.7

R1

100 k

Ω

R3

10 k

Ω

R2

60 k

Ω

D1

FB7

VSS (O)

Vin

−IN7−1

+IN7

−IN7−2

CFB7

I1

15

µA

A

B

Channel 7 equivalent circuit of soft start section

: Before CTL1-4, 7 are ON

: After CTL1-4, 7 are ON

Channel 7 soft start operating waveform

Soft start operate

Short detection suspended during this interval

:=

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MB3827PFV Fiches technique(PDF) 24 Page - Fujitsu Component Limited.

MB3827PFV Fiches technique(HTML) 24 Page - Fujitsu Component Limited.

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