DRV8801A-Q1_15 Datasheet, PDF(11/24 Page) Texas Instruments – DRV8801A-Q1 DMOS Full-Bridge Motor Drivers

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DRV8801A-Q1_15 Datasheet, PDF (11/24 Pages) Texas Instruments – DRV8801A-Q1 DMOS Full-Bridge Motor Drivers

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V(OUTx)

Hi -Z

DRV8801A-Q1

SLVSC79A â JUNE 2014 â REVISED SEPTEMBER 2014

I(OUTx)

I(PEAK)

I(OCP)

Enable,

Source

or Sink

nFAULT

t(DEG)

t(OCP)

Motor Lead

Short Condition

Figure 5. Overcurrent Control Timing

Normal DC

No Fault Condition

7.3.7 VPROPI

The VPROPI output is equal to approximately five times the voltage present on the SENSE pin. VPROPI is

meaningful only if there is a resistor connected to the SENSE pin. If the SENSE pin is connected to ground,

VPROPI measures 0 V. Also note that during slow decay (brake), VPROPI measures 0 V. VPROPI can output a

maximum of 2.5 V, because at 500 mV on SENSE, the H-bridge is disabled.

7.3.8 Protection Circuits

The DRV8801A-Q1 device is fully protected against VBB undervoltage, overcurrent, and overtemperature events.

7.3.8.1 VBB Undervoltage Lockout (UVLO)

If at any time the voltage on the VBB pin falls below the undervoltage lockout threshold voltage, all FETs in the H-

bridge are disabled and the charge pump is disabled. The nFAULT pin does not report the UVLO fault condition

and remains hi-Z. Operation resumes when VBB rises above the UVLO threshold.

7.3.8.2 Overcurrent Protection (OCP)

The current flowing through the high-side and low-side drivers is monitored to ensure that the motor lead is not

shorted to supply or ground. If a short is detected, all FETs in the H-bridge are disabled, nFAULT is driven low,

and a t(OCP) fault timer is started. After this period, t(OCP), the device is then allowed to follow the input commands

and another turn-on is attempted (nFAULT releases during this attempt). If there is still a fault condition, the cycle

repeats. If the short condition is not present after t(OCP) expires, normal operation resumes and nFAULT is

released.

7.3.8.3 Overtemperature Warning (OTW)

If the die temperature increases past the thermal warning threshold the nFAULT pin is driven low. When the die

temperature has fallen below the hysteresis level, the nFAULT pin is released. If the die temperature continues to

increase, the device enters overtemperature shutdown as described in the Overtemperature Shutdown (OTS)

section.

Product Folder Links: DRV8801A-Q1

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