DRV8461SPWPR datasheet(57/117 Pages) TI

57 / 117 page

4.5V

65V

nSLEEP

VCC

UVLO

H-BRIDGE,

CHARGE PUMP,

DIGITAL

ENABLED

DISABLED

DVDD

nFAULT

NPOR

CLR_FLT

Figure 7-41. Logic Supply POR

7.3.19.4 Overcurrent Protection (OCP)

An analog current-limit circuit on any MOSFET limits the current through that MOSFET by removing the gate

drive. If this current limit persists for longer than the tOCP time, an overcurrent fault is detected.

• The MOSFETs in both H-bridges are disabled

• nFAULT is driven low

• Charge pump remains active.

• When operating with SPI interface -

– FAULT and OCP bits are latched 1b

– For xOUTy to VM short, corresponding OCP_LSy_x bit becomes 1b

– For xOUTy to ground short, corresponding OCP_HSxy_x bit becomes 1b

– The TOCP bit programs the overcurrent protection deglitch time.

The overcurrent protection can operate in two different modes: latched shutdown and automatic retry. The

operating modes can be changed on the fly.

7.3.19.4.1 Latched Shutdown

To select latched shutdown mode:

• For H/W interface, the ENABLE pin has to be Hi-Z

• For SPI interface, the OCP_MODE bit should be 0b

In this mode, once the OCP condition is removed, normal operation resumes after applying a CLR_FLT

command, an nSLEEP reset pulse or a power cycling.

7.3.19.4.2 Automatic Retry

To select automatic retry mode:

• For H/W interface, the ENABLE pin has to be HIGH (> 2.7 V)

• For SPI interface, the OCP_MODE bit should be 1b

In this mode, normal operation resumes automatically (motor-driver operation and nFAULT released) after the

tRETRY time has elapsed and the fault condition is removed.

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DRV8461

SLOSE98 – DECEMBER 2022

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