MP6506 –2.7V-TO-15V, 500mA, STEPPER MOTOR DRIVER
MP6506 Rev. 1.0 www.MonolithicPower.com 10
5/22/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
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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
I
A/BOUT1
Forward Reverse Forward Reverse
Slow DecayFast 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.
