MP6600

– 35V, 1.5A, STEPPER MOTOR DRIVER W/ INTERNAL CURRENT SENSE

MP6600 Rev. 1.01

www.MonolithicPower.com

14

12/27/2017

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© 2017 MPS. All Rights Reserved.

The nENBL pin is used to control the output

drivers. When nENBL is low, the output H-

bridge outputs are enabled, and the rising

edges on STEP are recognized. When nENBL

is high, the H-bridge outputs are disabled, and

the STEP input is ignored. nENBL has an

internal pull-down resistor.

Fault Reporting

The MP6600 provides an nFAULT pin, which

reports if a fault condition (such as OCP, OTP,

or OVP) occurs. nFAULT is an open-drain

output and is driven low when a fault condition

occurs. If the fault condition is removed,

nFAULT is pulled high by an external pull-up

resistor.

Over-Current Protection (OCP)

Over-current protection (OCP) circuitry limits

the current through the MOSFETs by disabling

the

gate

driver.

If

the

over-current

limit

threshold is exceeded for 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 2.4ms typically,

at which time it is re-enabled automatically.

Over-current conditions on both 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.

Over-Voltage Protection (OVP)

If the input voltage on 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

below 36V.

Input

Under-Voltage

Lockout

(UVLO)

Protection

If at any time the voltage on VIN falls below the

under-voltage lockout (UVLO) threshold voltage,

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.