MP6506 –2.7V-TO-15V, 500mA, STEPPER MOTOR DRIVER

MP6506 Rev. 1.0

www.MonolithicPower.com

10

5/22/2014

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Table 2: PWM Control

A/BIN1

A/BIN2

Mode

H (PWM)

L

Forward

L (PWM)

L

Fast Decay

L

H (PWM)

Reverse

L

L (PWM)

Fast Decay

H

L (PWM)

Forward

H

H (PWM)

Slow Decay

L (PWM)

H

Reverse

H (PWM)

H

Slow Decay

A/B IN1

A/B IN2

Forward

Reverse

Forward

Reverse

Slow Decay

Fast Decay

0

0

0

Figure 4: External PWM Current Control Waveform

Sleep Mode

The MP6506 provides low-power standby sleep

mode.

Connect the nSLEEP pin to logic low to enable a

low-power sleep state. In this state, the two full

bridges are disabled and the internal circuits

such as the gate drive, internal regulator, and

charge pump all shut down. Connect the

nSLEEP pin to logic high to wake up the MP6506

from sleep mode, though there is a delay time of

~1ms until the internal circuitry stabilizes.

Enable

If all the inputs (AIN1, AIN2, BIN1 and BIN2) are

logic low, the MP6506’s outputs are disabled

while the charger pump and internal regulator

remain active.

Thermal Shutdown

The junction temperature of the IC is internally

monitored. If the junction temperature exceeds

the threshold value (typically 165ºC), the

converter is shut down (the fault pin goes low)

and recoveries once the junction temperature

drops to about 150ºC (15ºC hysteresis).

UVLO protection

The MP6506 has UVLO protection. When the

VIN exceeds the UVLO rising threshold, the

MP6506 powers up. It shuts off when VIN drops

below the UVLO falling threshold.