MP6501A – 35V, 2.5A MICROSTEPPING MOTOR DRIVER WITH INTEGRATED FETS

MP6501A Rev. 1.11

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8/22/2016

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the fault condition occurs. If the fault condition

is released, the nFAULT pin would be pulled to

high level.

Over-Current Protection

The over-current protection circuit limits the

current through the FET by disabling the gate

driver. If the over-current limit threshold is

reached and lasts for longer than the over-

current deglitch time, all MOSFETs in the H-

bridge will be disabled and the nFAULT pin will

be driven low. The driver will remain disabled

and is reset to enable state after 5ms(typ). After

5 times auto-recovery, the chip will shutdown if

the over-current condition still exists.

Over-current conditions on both high and low

side devices; i.e., a short to ground, supply, or

across the motor winding will all result in an

over-current shutdown. Note that over-current

protection does not use the current sense

circuitry used for PWM current control, and is

independent of the sense resistor value or

VREF voltage.

Over-Voltage Protection

If the input voltage on the VIN pin is higher than

the OVP threshold, the H-bridge output will be

disabled and the nFAULT pin will be driven low.

This protection is released when VIN drops to a

safe level.

Input UVLO Protection

If at any time the voltage on the VIN pin falls

below the under-voltage lockout threshold

voltage, all circuitry in the device will be

disabled and internal logic will be reset.

Operation will resume when VIN rises above

the UVLO threshold.

Thermal Shutdown

If the die temperature exceeds safe limits, all

MOSFETs in the H-bridge will be disabled and

the nFAULT pin will be driven low. Once the die

temperature has fallen to a safe level operation

will automatically resume.