STSPIN830 datasheet(13/27 Pages) STMICROELECTRONICS

Part #	STSPIN830

Description	Compact and versatile three-phase and three-sense motor driver

PDF	27 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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13 / 27 page

Figure 7. Overcurrent and short-circuit protections management

FAULT_MCU

MCU

EN_MCU

Power

stage

FAULT

VIH

VIL

Overcurrent

protection

ENABLED

DISABLED

ENABLED

CEN

REN

tDIS

EN\FAULT

DEVICE

RELEASE

OC\SC

THSD

FAULT

AM040384

RELEASE

charge

OCSD

discharge

The total disable time after an overcurrent event is set sizing properly the external network connected to EN

\FAULT pin (refer to Figure 8. Disable time versus REN and CEN values (VDD = 3.3 V) ) and it is the sum of the

discharging and charging time of the CEN capacitor:

Equation 2

(2)

tDIS = tdischarge + tcharge

Considering tdischarge is normally significantly lower than tcharge, its contribution is negligible and the disable time

is almost equal to tcharge only:

Equation 3

(3)

tDIS≅REN×CEN×ln VDD−REN×IPD −VRELEASE

VDD−REN×IPD −VIH

Where VDD is the pull-up voltage of REN resistor.

The recommended value for REN and CEN are respectively 39 kΩ and 10 nF that allow obtaining 200 µs

disable time.

STSPIN830

Device protections

DS12584 - Rev 2

page 13/27

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