Data Sheet

ManualsBrandsPololu ManualsStepper Motor ControllersMP6500 Stepper Motor Driver Carrier (Digital Current Control)

MP6500 – 35V, 2.5A STEP MOTOR DRIVER W/ INTERNAL CURRENT SENSE

MP6500 Rev. 1.0 www.MonolithicPower.com 14

6/22/2017 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

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 MP6500 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.