STSPIN32F0602 datasheet(19/32 Pages) STMICROELECTRONICS

19 / 32 page

If no external pull-up is connected to OD, the external COD capacitor is discharged with a time constant defined

by COD and the internal MOSFET's characteristic (Equation 1), and the Restart time is determined by the internal

current source IOD and by COD (Equation 2 ).

Equation 1

(1)

t1≅RON_OD ∙COD∙ln VODVSSDl

Equation 2

(2)

t2≅COD∙ VSSDh

IOD ∙ln VSSDl−VOD

VSSDh−VOD

Where VOD = VFLOAT_OD In case the OD pin is connected to VCC by an external pull-up resistor ROD_ext, the

OD discharge time is determined by the external network ROD_ext COD and by the internal MOSFET's RON_OD

(Equation 3), while the Restart time is determined by current in ROD_ext (Equation 4)

Equation 3

(3)

t1≅COD∙ ROD_ext//RON_OD ∙ln VOD−Von

VSSDl−Von

Equation 4

(4)

t2≅COD∙ ROD_ext ∙ln VSSDl−VOD

VSSDh−VOD

where

Von= RON_OD

ROD_ext+RON_OD ∙Vcc ; VOD=Vcc

Figure 10. Smart shutdown timing waveforms

SMART SHUTDOWN CIRCUIT

LVG/HVG

OD gate

(internal)

CIN

Fast shut down

the driver outputs are switched off

disable time

FAULT

VREF

tFCIN

tCINoff

VSSDh

VSSDl

VOD

COD

SMART

LOGIC

RON_OD

IOD

5 V

VCC

COD

SMART

LOGIC

RON_OD

IOD

5 V

ROD_ext

external pull-up

immediately after the comparator triggering

STSPIN32F0601, STSPIN32F0602

Gate driver

DS12981 - Rev 5

page 19/32

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