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PDF MP6501A Data sheet ( Hoja de datos )
| Número de pieza | MP6501A | |
| Descripción | 2.5A Stepper Motor Driver | |
| Fabricantes | MPS | |
| Logotipo |  |
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The Future of Analog IC Technology
MP6501A
8V to 35V, 2.5A Stepper Motor Driver
with Integrated MOSFETs
DESCRIPTION
The MP6501A is a stepper motor driver with a
built-in micro stepping translator. It operates
from a supply voltage of up to 35V and can
deliver motor current up to 2.5A. The MP6501A
can operate a bipolar stepper motor in full-,
half-, quarter-, and eighth- step modes. Internal
safety features include over-current protection,
input over-voltage protection, UVLO and
thermal shutdown. The part has a fixed 3.3V
reference output, which allows it to operate
without any control power supply and work with
any microcontroller. Ron of the switches is as
low as 230mΩ. Current sensing is done by
external resistors.
The MP6501A comes in a space-saving
TSSOP-28 package with exposed thermal pad.
FEATURES
• Wide 8V to 35V Input Voltage Range
• Two Internal Full Bridge PWM Converters
• Low On Resistance(HS:220mΩ; LS:220mΩ)
• No Control Power Supply Required
• Simple Logic Interface
• 3.3 and 5 V Compatible Logic Supply
• Full-, Half-, Quarter-, and Eighth- Step
Functionality
• 2.5A Maximum Output Current
• Adjustable Mixed Decay Ratio
• Over-Current Protection
• Input OVP Function
• Thermal Shutdown and UVLO Protection
• Space-saving TSSOP-28 EP Package
• Fault Indication Output
APPLICATIONS
• Bipolar Stepper Motors
• Printers
All MPS parts are lead-free and adhere to the RoHS directive. For MPS green
status, please visit MPS website under Products, Quality Assurance page.
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
MP6501A Rev. 1.1
www.MonolithicPower.com
10/31/2014
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
1
1 page  
MP6501A – 35V, 2.5A MICROSTEPPING MOTOR DRIVER WITH INTEGRATED FETS
ELECTRICAL CHARACTERISTICS (continued)
VIN=24V, TA = +25°C, unless otherwise noted.
Current Control
Constant Off Time
Blanking time
Crossover Dead Time
VREF Input Current
SENx Trip Voltage
Current Trip Accuracy
Charge Pump Frequency
tOFF Rt=200kΩ
20 30 40
tBLANK
tDT
HS off to LS on or LS off to
HS on for one bridge arm
2
400
IREF VREF=3.3V
3.5
VTRIP
VREF=3.3V, 100%
switch in test mode)
(no
615
645
675
∆ITRIP
fCP
VREF=3.3V, 70%-100%
VREF=3.3V, 38%-64%
VREF=3.3V, 19%-30%
VREF=3.3V, <10%
-5 5
-10 10
-15 15
-20 20
600
µs
µs
ns
µA
mV
%
%
%
%
kHz
Notes:
5) Not tested in production.
MP6501A Rev. 1.1
www.MonolithicPower.com
10/31/2014
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
5
5 Page 
MP6501A – 35V, 2.5A MICROSTEPPING MOTOR DRIVER WITH INTEGRATED FETS
OPERATION
The MP6501A is a bipolar stepper motor driver
that integrates 8 N-Channel power MOSFETs
arranged as 2 full-bridges, with 2.5A current
capability over a wide input voltage range of 8V
to 35V. It is designed to operate bipolar stepper
motors in full-, half-, quarter-, and eighth- step
modes. The current in each of the two output
full-bridges is regulated with programmable
constant off-time PWM (pulse width modulated)
control circuitry. At each step, the current for
each full-bridge is set by the value of its
external current sense resistor, a reference
voltage (VREF), and the output voltage of its
DAC which is controlled by the output of the
translator.
Stepping
The motor moves step by step by applying a
series of pulses to the STEP pin. A rising edge
on the STEP input sequences the translator
one increment in the direction set by the level of
the DIR input. The translator controls the input
to the DACs and the direction of current flow in
each winding. The amplitude of the increment is
determined by the state of inputs MS1, MS2
and MS3 (see Table 1).
The STEP input minimum high/low pulse width
is 1us. The logic control signals MSx and DIR
require at least 200ns setup time and hold time
to the STEP rising edge.
Time Duration
Symbol Typ.
Step minimum HIGH
pulse width
tA
1
Step minimum LOW pulse
width
tB
1
Setup time, input change
to STEP
tC
200
Hold time, input change to
STEP
tD
200
Figure 2: Logic Timing Diagram
Unit
µs
µs
ns
ns
The motor winding currents are regulated by a
programmable constant off-time PWM current
control circuit. This operates as follows:
• Initially, a diagonal pair of MOSFETs
turns on so current can flow through the
motor winding.
• The current increases in the motor
winding, which is sensed by an external
sense resistor (RSENSE). During the initial
blanking time tBLANK, the high-side
MOSFET always turns on regardless of
current limit detection.
• When the voltage across RSENSE reaches
the current regulation threshold, the
internal current comparator either shuts
off the high-side MOSFET so the
winding inductance current freewheels
through the two low-side MOSFETs
(slow decay), or turns on the opposite
diagonal pair of MOSFETs so the
current flows back to the input (fast
decay).
• The current keeps decreasing for the
constant off-time.
• The cycle then repeats.
The constant off-time, toff, is determined by the
selection of an external resistor Rt which is
approximated by
tOFF (ns) = 190 × Rt (kΩ)
The full-scale (100%) current limit threshold is
calculated by
IMax −LIMIT
=
VREF
5 × RSENSE
The DAC output reduces the VREF output to the
current sense comparator in precise steps (see
table 2 for %ITrip-LIMIT at each step).
I = %I ITrip−LIMIT
Trip−LIMIT Max −LIMIT
Microstep Select (MS1, MS2, MS3)
The step mode is selected by applying logic
high and low voltages to the MS1, MS2 and
MS3 pins as shown in Table 1. The MP6501A
supports full-, half-, quarter-, and eighth- step
modes for progressively finer step
MP6501A Rev. 1.1
www.MonolithicPower.com
10/31/2014
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
11
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet MP6501A.PDF ] | |
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