MP6522

– 35V, 3.2A, H-BRIDGE MOTOR DRIVER

1.0MP6522 Rev. 1.01

www.MonolithicPower.com

10

4/17/2018

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Over-Current Protection (OCP)

The

over-current

protection

(OCP)

circuit

protects

the

device

from

damaging

high

currents at the outputs. If the current through a

MOSFET exceeds the over-current threshold

for longer than the over-current deglitch time, all

MOSFETs in the H-bridge are disabled, and

nFAULT is driven low. The driver remains

which

point

the

driver

is

re-enabled

automatically.

Over-current

conditions

are

sensed on both high- and low-side devices (i.e.:

a short to ground, supply, or across the motor

winding results 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 ISET resistor value.

Over-Voltage Protection (OVP)

If the input voltage applied to VIN is higher than

the over-voltage protection (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

Under-Voltage

Lockout

(UVLO)

Protection

If at any time the voltage on VIN falls below the

under-voltage lockout (UVLO) threshold, 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 the 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.