MP6504

– 32V, 2A, MICROSTEPPING MOTOR DRIVER W/ INTEGRATED MOSFETS

MP6504 Rev. 1.0

www.MonolithicPower.com

12

5/17/2017

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Fault

The MP6504 provides an nFAULT pin, which is

driven low when a fault condition such as OCP,

OTP, or OVP occurs. nFAULT is an open-drain

output, so if it is used, an external pull-up

resistor is required. When the fault condition is

released, nFAULT is pulled to a high level by

the external pull-up resistor.

Over-Current Protection (OCP)

The over-current protection (OCP) circuit limits

the current through any MOSFET. If the over-

current limit threshold is reached and lasts

longer than the over-current deglitch time, all

MOSFETs in the H-bridge are disabled, and

nFAULT is driven low. The driver remains

disabled for approximately 5ms, then is re-

enabled automatically. If this cycle repeats five

times, the MP6504 shuts down.

Over-current conditions on both the high- and

low-side devices (i.e.: a short to ground, supply,

or across the motor winding) result in an over-

current shutdown. Note that OCP 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 (OVP)

If the input voltage on VIN is higher than the

OVP threshold, the H-bridge output is disabled,

and nFAULT is driven low. This protection is

released when VIN drops to a safe level.

Input UVLO Protection

If the voltage on VIN falls below the under-

voltage lockout (UVLO) threshold voltage at any

time, all circuitry in the device is disabled, and

the internal logic is reset. Operation resumes

when VIN rises above the UVLO threshold.

Thermal Shutdown

If the die temperature exceeds safe limits, all

MOSFETs in the H-bridge are disabled, and

nFAULT

is

driven

low.

Once

the

die

temperature has fallen to a safe level, operation

resumes automatically.