USB6B1 Ver la hoja de datos (PDF) - STMicroelectronics

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Fabricante

USB6B1

DATA LINES PROTECTION

STMicroelectronics 

USB6Bx

TECHNICAL INFORMATION

SURGE PROTECTION

The USB6Bx is particularly optimized to perform

surge protection based on the rail to rail topology.

The clamping voltage VCL can be estimated as follow:

VCL+ =Vcc + VF for positive surges

VCL - = - VF

for negative surges

with: VF = Vt + rd.Ip

(VF forward drop voltage) / (Vt forward drop

threshold voltage)

Note: the estimations do not take into account

phenomena due to parasitic inductances.

Fig. A1 :

ESD

SURGE

Lw

Lw di

Vf

dt

I/O

+Vcc

VI/O

Lw di

dt

Vcl+ =

Vcc+Vf+

Lw

di

dt

surge >0

Vcl- =

-Vf-

Lw

di

dt

surge <0

GND

Vcl+

Lw di

dt

POSITIVE

SURGE

Vcc+Vf

t

tr=1ns

tr=1ns

t

-Vf

-Lw di

dt

NEGATIVE

SURGE

Vcl-

2/9

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