DRV8848_16 Datasheet, PDF(14/27 Page) Texas Instruments

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DRV8848_16 Datasheet, PDF (14/27 Pages) Texas Instruments – Dual H-Bridge Motor Driver

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DRV8848

SLLSEL7A â OCTOBER 2014 â REVISED NOVEMBER 2015

www.ti.com

7.3.6.2 TSD

If the die temperature exceeds safe limits TTSD, all FETs in the H-bridge are disabled and the nFAULT pin is

driven low. After the die temperature has fallen to a safe level, operation automatically resumes. The nFAULT pin

is released after operation has resumed.

7.3.6.3 UVLO

If at any time the voltage on the VM pin falls below the UVLO falling threshold voltage, VUVLO, all circuitry in the

device is disabled, and all internal logic is reset. Operation resumes when VVM rises above the UVLO rising

threshold. The nFAULT pin is driven low during an undervoltage condition and is released after operation has

resumed.

FAULT

VM undervoltage (UVLO)

Overcurrent (OCP)

Thermal shutdown (TSD)

ERROR REPORT

nFAULT unlatched

Table 2. Fault Handling

H-BRIDGE

Disabled

INTERNAL

CIRCUITS

Shut down

Disabled

Operating

Disabled

Operating

RECOVERY

System and fault clears on recovery

System and fault clears on recovery and

motor is driven after time, tRETRY

System and fault clears on recovery

7.4 Device Functional Modes

The DRV8848 is active unless the nSLEEP pin is brought logic low. In sleep mode, the VINT regulator is

disabled and the H-bridge FETs are disabled Hi-Z. Note that tSLEEP must elapse after a falling edge on the

nSLEEP pin before the device is in sleep mode. The DRV8848 is brought out of sleep mode automatically if

nSLEEP is brought logic high. Note that tWAKE must elapse before the output change state after wake-up.

When VVM falls below the VM UVLO threshold (VUVLO), the output driver, internal logic, and VINT regulator are

reset.

MODE

Operating

Sleep

Fault

Table 3. Functional Modes

CONDITION

4 V < VVM < 18 V

nSLEEP pin = 1

4 V < VVM < 18 V

nSLEEP pin = 0

Any fault condition met

H-BRIDGE

Operating

Disabled

VINT

Operating

Disabled

Depends on fault

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