SGM42630 [SGMICRO]
Stepper Motor Driver IC;
| 型号： | SGM42630 |
| 厂家： | 
Shengbang Microelectronics Co, Ltd |
| 描述： | Stepper Motor Driver IC |
| 文件： | 总18页 (文件大小：751K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SGM42630
Stepper Motor Driver IC
GENERAL DESCRIPTION
FEATURES
The SGM42630 is a bipolar stepper motor driver suitable
for automated positioning and movement control in
equipment such as printers, scanners and robotic
mechanisms. To control the stepper motor, two H-bridges
are integrated in the device for the two motor windings
along with a microstepping indexer logic. Bridge currents
are regulated by chopping the motor supply voltage
across the windings.
● Motor Power Supply Voltage Range: 8V to 35V
● PWM with up to 2.6A Current for each Winding
● Low On-Resistance: 0.29Ω for HS + LS, @ +25℃
● Microstepping Indexer: 1, 1/2, 1/4 and 1/8
● Step and Direction Interface
● Programmable Decay, Blanking and Off-Time
● Auto-Decay Mode
● UVLO for VM, VCC, VCP, VGD Voltages
● Over-Current Protection (OCP)
The step (STEP) and direction (DIR) inputs are provided
for simple interfacing to the controller. The device also
provides two microstepping input pins (USM0 and USM1)
to choose the step size (full, half, quarter and eighth step).
● Thermal Shutdown (TSD)
● Available in a Green TSSOP-28 (Exposed Pad)
Package
Fast, slow and mixed (fast then slow) decay modes are
selectable by applying proper voltage to DECAY input.
Programmable blanking and off-time of the H-bridge
PWM and selectable decay modes make the device
very flexible and capable of driving a wide range of
stepper motors with up to 2.6A per winding.
APPLICATIONS
Robotic Mechanisms
Textile Equipment
Scanners
Positioning and Tracking
Printers
A number of protection features are provided in the device
including under-voltage lockout, short-circuit, over-current
and over-temperature shutdown.
The device is available in a Green TSSOP-28 (Exposed
Pad) package.
SIMPLIFIED SCHEMATIC
8V to 35V
AOUT1
AOUT2
STEP
SGM42630
Stepper
Motor
2.6A
DIR
Step Size
nHOME
Stepper
Motor Driver
with Protections
2.6A
BOUT1
BOUT2
SG Micro Corp
MAY 2023–REV. B
www.sg-micro.com
SGM42630
Stepper Motor Driver IC
PACKAGE/ORDERING INFORMATION
PACKAGE
DESCRIPTION
ORDERING
NUMBER
PACKAGE
MARKING
PACKING
OPTION
MODEL
SGM42630
YPTS28
XXXXX
SGM42630
TSSOP-28 (Exposed Pad)
SGM42630YPTS28G/TR
Tape and Reel, 4000
MARKING INFORMATION
NOTE: XXXXX = Date Code, Trace Code and Vendor Code.
X X X X X
Vendor Code
Trace Code
Date Code - Year
Green (RoHS & HSF): SG Micro Corp defines "Green" to mean Pb-Free (RoHS compatible) and free of halogen substances. If
you have additional comments or questions, please contact your SGMICRO representative directly.
ABSOLUTE MAXIMUM RATINGS
ESD SENSITIVITY CAUTION
Motor Power Supply Voltage Range, VM (VMA or VMB)............
........................................................................... -0.3V to 38V
Logic Power Supply Voltage Range, VCC............. -0.3V to 6V
Digital Pins Input Voltage Range ......................... -0.5V to 6V
VREF Input Voltage, VREF ....................................... 0V to VCC
ISENx Pins Voltage....................................... -0.5V to 0.875V
Peak Output Current (Motor Drive)............. Limited Internally
Package Thermal Resistance
This integrated circuit can be damaged if ESD protections are
not considered carefully. SGMICRO recommends that all
integrated circuits be handled with appropriate precautions.
Failureto observe proper handlingand installation procedures
can cause damage. ESD damage can range from subtle
performance degradation tocomplete device failure. Precision
integrated circuits may be more susceptible to damage
because even small parametric changes could cause the
device not to meet the published specifications.
TSSOP-28 (Exposed Pad), θJA .................................. 32℃/W
Operating Junction Temperature.................................+150℃
Storage Temperature Range.........................-65℃ to +150℃
Lead Temperature (Soldering, 10s) ............................+260℃
ESD Susceptibility
DISCLAIMER
SG Micro Corp reserves the right to make any change in
circuit design, or specifications without prior notice.
HBM.............................................................................4000V
CDM ............................................................................1000V
PIN CONFIGURATION
(TOP VIEW)
RECOMMENDED OPERATING CONDITIONS
Motor Power Supply Voltage Range (1), VM.............8V to 35V
Logic Power Supply Voltage Range, VCC...............3V to 5.5V
VREF Input Voltage, VREF....................................... 0V to VCC
RX Resistance Value, RX................................ 12kΩ to 100kΩ
CX Capacitance Value, CX .......................... 470pF to 3000pF
Operating Junction Temperature Range......-40℃ to +150℃
1
2
3
4
28
27
26
25
ISENA
nHOME
DIR
VMA
nSLEEP
nENABLE
AOUT2
AOUT1
5
6
7
8
24
23
22
21
DECAY
RCA
CP2
CP1
VCP
GND
GND
NOTE: 1. VMA and VMB pins must be tied to the same
source (VM).
GND
VREF
9
20
19
18
17
RCB
VCC
VGD
OVERSTRESS CAUTION
10
11
12
STEP
Stresses beyond those listed in Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to
absolute maximum rating conditions for extended periods
may affect reliability. Functional operation of the device at any
conditions beyond those indicated in the Recommended
Operating Conditions section is not implied.
BOUT1
USM1
BOUT2
nRESET
13
14
16
15
USM0
ISENB
nSR
VMB
TSSOP-28 (Exposed Pad)
SG Micro Corp
www.sg-micro.com
MAY 2023
2
SGM42630
Stepper Motor Driver IC
PIN DESCRIPTIONS
PIN
TYPE
FUNCTION
NO.
1
NAME
ISENA
nHOME
DIR
-
O
I
Bridge A ISENSE (GND). Connect with a sensing resistor to power ground.
Home Position Logic Output. Pull this pin low when step table is at home state or pull this pin high at other
states.
2
3
Direction Input Pin. Control the direction of stepping. It has a weak internal pull-down.
Bridge A Node 1. Connect to one end (+) of the stepper motor winding A.
4
AOUT1
O
Decay Mode Select with Weak Internal Pull-Down. Voltage applied to this pin sets one of the three decay
modes. See details in motor driver description. A 0.1μF ~ 0.22μF capacitor needs to be placed between
DECAY and GND pins.
5
DECAY
I
Bridge A Blanking and Off-Time Setting. Connect it to the parallel programming resistor (RA) and capacitor
(CA). See Current Regulation section for the adjustment details and Equations 2, 3 and 4.
6
7, 21
8
RCA
GND
VREF
RCB
I
-
I
I
Ground Reference.
Reference Voltage for Current Set. Apply the reference voltage to set the full-scale winding current value.
Bridge B Blanking and Off-Time Setting. Connect it to the parallel programming resistor (RB) and capacitor
(CB). See Current Regulation section for the adjustment details and Equations 2, 3 and 4.
Digital Logic Supply Voltage (3V to 5.5V). A 0.1μF ceramic decoupling capacitor needs to be placed
between VCC and GND pins.
9
10
11
12
13
14
15
VCC
BOUT1
USM1
USM0
ISENB
VMB
-
O
I
Bridge B Node 1. Connect it to one end (+) of the stepper motor winding B.
Micro-Step Mode Selection Logic Input 1. USM0 and USM1 are logic inputs to set the step size to one of
the 4 options (full, half, quarter and eight micro-steps/step). It has a weak internal pull-down.
Micro-Step Mode Selection Logic Input 0. USM0 and USM1 are logic inputs to set the step size to one of
the 4 options (full, half, quarter and eight micro-steps/step). It has a weak internal pull-down.
I
-
Bridge B ISENSE (GND). Connect it to VM power ground through the current sense resistor for bridge B.
Power Supply for Bridge B. Connect it to the motor power supply (8V to 35V). VMA and VMB pins should
be tied to the same supply.
-
Synchronous Rectification Enable Input. Synchronous rectification is enabled if nSR pin is pulled low. Float
nSR pin to enter the auto-decay mode with synchronous rectification. With nSR = high, there is no
synchronous rectification and body diodes conducting the reverse current. In this case, maximum body
diode currents must be guaranteed to be less than 1.3A.
16
nSR
I
Reset Input. Active low reset with weak internal VCC pulling up to initializes microstepping indexer logic
and disable H-bridge outputs.
Bridge B Node 2. Connect to the other end (-) of the stepper motor winding B. IB is positive from BOUT1 to
BOUT2.
17
18
nRESET
BOUT2
I
O
Step Logic Input. Rising edge causes the microstepping indexer to move one step. It has a weak internal
pull-down.
19
20
22
23
24
25
26
27
STEP
VGD
I
IO
IO
IO
IO
O
I
Gate Drive Voltage of the Low-side Switches. Decouple to GND with a 0.22μF ceramic capacitor.
Gate Drive Voltage of the High-side Switches. Decouple with a 0.22μF ceramic capacitor to VM pin.
VCP
CP1
Charge Pump Flying Capacitor. A 0.22μF capacitor is used between CP1 and CP2 pins.
CP2
Bridge A Node 2. Connect it to the other end (-) of the stepper motor winding A. IA is positive from AOUT1
to AOUT2.
AOUT2
nENABLE
nSLEEP
Enable Input. Active low enable logic input with weak internal pull-up to VCC. A low enables outputs.
Sleep Mode Input. Active low sleep mode logic input with weak internal pull-down. Apply high to enable
device, and low to enter in the low-power sleep mode.
I
Power Supply for Bridge A. Connect to the motor power supply (8V to 35V). VMA and VMB pins should be
tied to the same supply.
28
VMA
GND
-
Exposed
Pad
G
Ground.
NOTE: I = input, O = output, IO = input or output, G = ground.
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MAY 2023
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SGM42630
Stepper Motor Driver IC
ELECTRICAL CHARACTERISTICS
(TJ = +25℃, Full = -40℃ to +85℃, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
TEMP
MIN
TYP
MAX
UNITS
Power Supply
Motor Power Supply Voltage
Logic Power Supply Voltage
VM Operating Supply Current
VCC Operating Supply Current
VM Sleep Mode Supply Current
VCC Sleep Mode Supply Current
VM Under-Voltage Lockout Voltage
VCC Under-Voltage Lockout Voltage
VREF Input
VM
VCC
IVM
8
3
12 or 24
3.3
35
5.5
0.6
1.5
330
15
V
V
+25℃
+25℃
+25℃
+25℃
+25℃
+25℃
+25℃
+25℃
VM = 35V, fPWM < 50kHz
fPWM < 50kHz
0.45
1.1
mA
mA
nA
μA
V
IVCC
IVMQ
IVCCQ
VM = 35V
20
12
VM_UVLO VM rising
VCC_UVLO VCC rising
6.7
7
2.72
2.95
V
VREF Input Current
IREF
VREF = 3.3V
-3
3
μA
+25℃
+25℃
Chopping Current Accuracy
Logic Inputs
ΔICHOP
VREF = 2.0V, 70% current
-10
10
%
Pull-Up Resistance
RPU
RPD
nENABLE, nRESET
270
270
kΩ
kΩ
+25℃
+25℃
DIR, STEP, nSLEEP, USM1,
USM0, nSR
Pull-Down Resistance
Input Low Voltage
Input High Voltage
Input Hysteresis
nHOME Output
Output Low Voltage
Output High Voltage
DECAY Input
VIL
VIH
Full
Full
0.2 × VCC
V
V
V
0.8 × VCC
VHYS
0.4 × VCC
+25℃
VOL
VOH
IO = 200μA
IO = -200μA
0.3 × VCC
V
V
+25℃
+25℃
0.7 × VCC
Low Threshold
VIL
VMID
VIH
To select fast decay mode
To select mixed decay mode
To select slow decay mode
0.2 × VCC
V
V
V
+25℃
+25℃
+25℃
0.2 × VCC to
0.6 × VCC
Mid Level Threshold
High Threshold
0.6 × VCC
H-Bridge FETs
LS + HS FET On-Resistance
Off-State Leakage Current
Protection
RDS(ON)
IOFF
VM = 24V, IO = 0.4A
290
380
15
mΩ
+25℃
+25℃
-15
µA
Thermal Shutdown Temperature
Over-Current Protection
OCP Deglitch Time
OCP Retry Time
TTSD
IOCP
tOCP
tRET
160
3.2
1.5
1
+25℃
+25℃
+25℃
+25℃
℃
A
µs
s
Motor Driver
Off-Time
tOFF
tBLANK
tDT
RX = 56kΩ, CX = 680pF
RX = 47kΩ, CX ≤ 1nF
nSR = 0
30
42
2.4
200
52
μs
μs
ns
ns
ns
+25℃
+25℃
+25℃
+25℃
+25℃
Current Sense Blanking Time
Dead Time
100
15
800
80
Rise Time
tR
Fall Time
tF
15
80
SG Micro Corp
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MAY 2023
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SGM42630
Stepper Motor Driver IC
TIMING PARAMETERS AND REQUIREMENTS
(TJ = +25℃, unless otherwise noted.)
SYMBOL
FUNCTION
MIN
MAX
UNITS
kHz
μs
fSTEP
Step frequency.
500
tWH (STEP)
tWL (STEP)
tSU (STEP)
tH (STEP)
tWAKE
Step pulse high duration.
Step pulse low duration.
1
1
μs
Command set-up time, before STEP rising.
250
250
ns
Command hold time, after STEP rising.
ns
Wake-up time, exit sleep (nSLEEP rising) to STEP input cannot be accepted.
Sleep time, enter sleep (nSLEEP falling) to outputs disabled.
Enable time, enable (nENABLE falling) to outputs enabled.
Disable time, disable (nENABLE rising) to outputs disabled.
Reset release time, (nRESET rising) to outputs enabled.
Reset time, (nRESET falling) to outputs disabled.
1
2.5
20
20
5
ms
μs
tnSLEEP
tnENABLE
tDISABLE
tnRESETR
tnRESET
μs
μs
μs
5
μs
fSTEP
tWH (STEP)
tWL (STEP)
tWAKE
tnSLEEP
nSLEEP
OUTPUT
STEP
DIR, USMx
tSU (STEP)
tH (STEP)
Figure 1. STEP Timing Definition
Figure 2. nSLEEP Timing Definition
tnRESETR
tnRESET
tnENABLE
tDISABLE
nRESET
OUTPUT
nENABLE
OUTPUT
Figure 3. nENABLE Timing Definition
Figure 4. nRESET Timing Definition
SG Micro Corp
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SGM42630
Stepper Motor Driver IC
TYPICAL PERFORMANCE CHARACTERISTICS
VM Operating Supply Current vs. Junction Temperature
500
VM Sleep Mode Supply Current vs. Junction Temperature
100
480
460
440
420
400
80
60
VM = 35V
VM = 35V
VM = 24V
VM = 8V
40
VM = 24V
20
VM = 8V
0
-50
-25
0
25
50
75
100
-50
-25
0
25
50
75
100
Temperature (℃)
Temperature (℃)
LS + HS FET On-Resistance vs. Junction Temperature
500
LS + HS FET On-Resistance vs. Motor Power Supply Voltage
500
VM = 35V
400
300
200
100
0
400
+85℃
300
+25℃
200
-40℃
100
0
-50
-25
0
25
50
75
100
6
11
16
21
26
31
36
Temperature (℃)
Motor Power Supply Voltage (V)
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SGM42630
Stepper Motor Driver IC
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
Mixed Decay
Auto Mode
STEP
OUTA
STEP
OUTA
Time (200ms/div)
Time (2ms/div)
Mixed Decay on Decreasing Steps
Mixed Decay on Increasing Steps
STEP
OUTA
STEP
OUTA
Time (200μs/div)
Time (200μs/div)
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SGM42630
Stepper Motor Driver IC
FUNCTIONAL BLOCK DIAGRAM
VM
VCC
VCC
CP1
VCC
UVLO
VGD
START_UP
Charge
Pump
CP2
VCP
HVLDO5V
VCC
OSC
BGR
VM
VREF
OTP
VREF
HS/LS OC
nENABLE
VMA
Logic
PWM
On/off
Sequence
VM
nRESET
nSLEEP
STEP
AOUT1
AOUT2
Pre-
Driver
M
Indexer
ISENA
DIR
CMP
AMP
Trimming
& Fuse
USM0
USM1
nSR
DAC
HS/LS OC
Indexer
VMB
VM
Protections
Others
BOUT1
BOUT2
VCC
nHOME
DECAY
Pre-
Driver
Mode
Detector
ISENB
GND
RCA
RCB
CMP
AMP
RC Driver
DAC
Indexer
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SGM42630
Stepper Motor Driver IC
DETAILED DESCRIPTION
Overview
VM
The SGM42630 is a flexible, bipolar stepper motor driver
including two integrated H-bridges with current sense
and regulation control plus a microstepping indexer. It
accepts 8V to 35V motor power supply voltages and can
deliver up to 2.6A for each winding. Sleep mode can be
used to minimize power consumption by the driver when
the device is idle. It is easy to use driver due to its STEP
and DIR inputs and the internal indexer. It is capable of
accurately microstepping without current loop regulation
or controller management.
D3
M1
D1
M3
S1
S1: Increasing
S2: Fast decay
S0: Slow decay
xOUT2
M4
xOUT1
M2
S2
S0
D2
D4
Decay mode is chosen based on the application needs.
For the SGM42630 fast, slow and mixed decay mode
options are available for flexible current regulation.
RSENSE
The driver can be adjusted to a wide range of stepper
motors by setting proper values for mixed decay, blanking,
and off-time.
Figure 5. Slow and Fast Decay Modes Current Paths
Mixed decay mode is also supported in which decay
starts in fast mode for a programmed period of time (tFD)
and then shifts to the slow decay mode for the reminder
of the fixed off-time.
Decay Mode
The current continues to flow in the same direction
during the off-time due to the large inductance of the
winding. There are two options for current flow direction
in the bridge switches during the off-time. Suppose that
by chopping, the drive current path S1 is stopped (by
turning off M1 or M1 & M4) in Figure 5. Then during the
off-time, the bridge can act in two different ways: the
current can be decayed by letting it circulate through the
lower switches (recirculation in M2/D2 and M4, shown as
path S0) or it can recycle the inductor energy back to the
VM source through M2/D2 and M3/D3 in path S2. In the
former case, the voltage across the winding will be
almost zero and current decay will be slow (slow decay),
but in the latter case, the voltage across the winding is
-VM and current decays in a faster rate (fast decay),
tending to reverse its direction. If synchronous mode is
on, switches are turned on to conduct rather than their
body diodes, otherwise, the diodes will conduct the
reverse current naturally. A short dead time is always
implemented before turning on M3 to avoid shoot
through in M3-M4 leg (similarly for the M3-M4 leg).
Synchronous rectification can be enabled by setting nSR
pin to logic low to use MOSFET on-channels rather than
their body diodes for conduction and reduce losses. In
synchronous mode, current reversal is not allowed and
bridge is disabled when the current approaches zero. (It
is not recommended to disable synchronous
rectification unless it is guaranteed that body diode
currents remain below 1.3A.)
Decay mode is selected by the voltage on the DECAY
pin (VDECAY). If the voltage is higher than 0.6 × VCC, slow
decay mode is selected and if it is less than 0.2 × VCC,
fast decay mode is used. When VDECAY is between
these levels, mixed decay mode is enabled and the
duration of fast portion (tFD) is determined by VDECAY as
approximated by (1):
0.6× V
VDECAY
CC
(1)
tFD = R ×C ×ln
X
X
where RX and CX are the same resistor and capacitor
connected to RCx inputs.
Figure 6 shows the blanking, fixed off-time and the
mixed decay mode for two PWM cycles. Each step (or
micro-step) may last for several PWM cycles
depending on the speed of rotation and the DC current
level is maintained by PWM chopping during the step
time. Current ripple is smaller with shorter PWM
off-time and higher VM voltage.
0.6 × VCC
RCA or
Pin DECAY Voltage
0.2 × VCC
RCB
Current
Fast
Decay
Slow
Decay
Blanking
Figure 6. PWM Waveform
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SGM42630
Stepper Motor Driver IC
DETAILED DESCRIPTION (continued)
reached. The maximum current deliverable to the
winding (100% or full-scale) can be calculated by (2):
Auto-Decay Mode
The device features an auto-decay mode in which it
can shift between mixed decay and slow decay
automatically to minimize current ripple. No external
decay setting is needed in this mode. The chip enters
auto-decay mode when nSR pin is floating.
VREF
IFS =
(2)
8×RSENSE
Assuming RSENSE = 0.1Ω and VREF = 1.8V, the chopping
current (100% full-scale) will be 2.25A.
Auto-Decay Performance
Microstepping is commonly used to get fractional step
sizes and smoother rotation. With microstepping, the
windings currents (IA and IB) are scaled with
predetermined ratios stored in a table, such that the
resulting magnetic field vector direction inside the
motor can be adjusted with small angle steps while
keeping the magnitude relatively constant for a steady
torque. Microstepping allows for very fine steps and
much less mechanical and electrical noise generation.
The cost is lower rotation speed and less than
maximum torque. Scaling of the current is implemented
by weighting the reference voltage using the DACs.
The microstepping indexer table is preloaded with the
scale values of each micro-step. More details are given
in the Microstepping Indexer section.
Time (50ms/div)
Table 1. Decay Mode Selections
DECAY Pin Voltage
0V ~ 0.2 × VCC
0.2 × VCC ~ 0.6 × VCC
> 0.6 × VCC
nSR
Decay Mode
Fast Decay
Mixed Decay
Slow Decay
Auto-Decay
When the H-bridge starts a PWM pulse, the transient
noise may affect the current sensing circuit and cause
false detection. Therefore, for a short current sense
blanking time (tBLANK) that is typically a few micro-
seconds the current sensing is ignored. After the
blanking time, the current is sensed and when the
reference (chopping current value) is reached, the
pulse is switched off for a fixed off-time (tOFF) duration.
The resistor and capacitor connected to the RCx pins,
determine the blanking and off-time of bridge x (A or B)
that are approximated by (3) and (4):
L
L
L
X
Floating
Fast Decay through Body
Diode
X
H
X = Don’t Care
Current Regulation
PWM chopping is used for current regulation in the
H-bridges. Motor windings typically have a large
inductance of a few mH with a few ohms of DC
resistance. H-bridge can apply VM, 0 or -VM voltage
across the winding and the current will start to rise or
fall depending on the applied voltage and polarity with a
time constant (L/R). Bridge current is sensed across
shunt resistor connected to ISENx and is multiplied by
a gain of 8 before being compared to the current setting
reference voltage coming from VREF input and scaling
DACs. Each PWM pulse will turn off (chopped) when
the comparator detects that the trip current level is
tOFF = 1.1 × RX × CX
(3)
The recommended selection range for RX is 12kΩ to
100kΩ and for CX is 0.47nF to 3nF.
tBLANK = 1.4 × CX + 1
(4)
The unit of CX is nF. tBLANK has a typical value of 2.4μs if
Cx is less than 1nF. Other cases can refer to the
Equation 4.
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SGM42630
Stepper Motor Driver IC
DETAILED DESCRIPTION (continued)
microstepping). The scale values set the chopping
threshold (ITRIP) for current regulation as a percentage
of the full-scale current (IFS) for each step. The home
state is at 45° in which A and B windings are both
excited with equal 71% of IFS. After a reset or power-up,
the indexer resets to the home state and output
nHOME pin is driven low only at this state.
Microstepping Indexer
Table 2 shows four main microstepping configurations
that are selectable for the embedded indexer using
USM1 and USM0 pins. The scaling values of A and B
currents for microstepping and the resulting step sizes
for all 4 options of USM1/USM0 (00, 01, 10, 11) are
shown in Table 3 for DIR = high direction.
Table 2. Microstepping Selection Bits
With each rising edge of the STEP input, the indexer
goes to the next state in the table. With DIR = low, the
sequence is reversed. Current is defined positive when
it flows from OUT1 to OUT2. These specific values
form a near sinusoidal current in the windings (IA and IB)
when motor is stepped in a constant speed, resulting in
very small audible noise and vibration (wave
USM1
USM0
Step Mode
0
0
1
1
0
1
0
1
Full step (2-phase excitation)
1/2 step (1-2 phase excitation)
1/4 step (W1-2 phase excitation)
1/8 step
Table 3. Microstepping Indexer with DIR = 1 Direction
Full Step Pulsing 1/2 Step Pulsing 1/4 Step Pulsing 1/8 Step Pulsing
AOUTx Current
(% Full-Scale)
BOUTx Current
Step Angle (°)
(% Full-Scale)
(USM = 00)
(USM = 01)
(USM = 10)
(USM = 11)
1
1
1
100
98
0
20
0
11.25
2
2
3
3
92
38
22.5
4
83
56
33.75
45 (home state)
56.25
67.5
1
2
3
4
5
6
7
8
5
71
71
6
56
83
4
7
38
92
8
20
98
78.75
90
5
9
0
100
98
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
-20
-38
-56
-71
-83
-92
-98
-100
-98
-92
-83
-71
-56
-38
-20
0
101.25
112.5
6
92
83
123.75
135
2
3
4
7
71
56
146.25
157.5
168.75
180
8
38
20
9
0
-20
-38
-56
-71
-83
-92
-98
-100
-98
-92
-83
-71
-56
-38
-20
191.25
202.5
213.75
225
10
11
12
13
14
15
16
236.25
247.5
258.75
270
20
281.25
292.5
303.75
315
38
56
71
83
326.25
337.5
348.75
92
98
SG Micro Corp
www.sg-micro.com
MAY 2023
11
SGM42630
Stepper Motor Driver IC
DETAILED DESCRIPTION (continued)
Protection Circuits
nRESET
When the nRESET pin is pulled low, the H-bridges are
both disabled and the microstepping indexer is reset to
the home state. Pulses on the STEP input are ignored
while nRESET is low.
Over-Current Protection (OCP)
Each MOSFET is protected by its own preset over-
current limit. In case of an over-current (any direction),
the whole bridge will be disabled (shutdown) for about
1s, or until nENABLE pin is toggled high and low, or
until power is recycled. An over-current may occur due
to a short between a switching node and ground or to
the VM supply line or to the other node of the bridge (a
winding short). Current protections are independent of
PWM current sensing or VREF voltage. (If synchronous
rectification is disabled, current should not exceed 1.3A
in body diodes.)
nENABLE
The nENABLE pin controls the H-bridge drivers but has
no effect on the control logic or microstepping indexer
operation. Output drivers are enabled when nENABLE
is low, and goes to the high impedance state when
nENABLE is high. Other controls including the indexer
STEP and DIR inputs are functional when nENABLE is
high.
Microstepping indexer will be reset to the home state if
an over-current shutdown happens.
nSLEEP
To idle the device and put it in the low-power sleep
mode, the nSLEEP pin can be pulled low. In the sleep
mode, all H-bridges are disabled, internal clocks are
paused and the charge pumps for the gate drivers are
stopped. All logic inputs are ignored in sleep mode.
Thermal Shutdown (TSD)
All bridges and drivers are shutdown if a junction over-
temperature occurs in the device and the microstepping
indexer is reset to the home state. Once the temperature
goes back to the safe level, device resumes its operation.
Under-Voltage Lockout (UVLO)
If any of the source voltage (VMA, VMB, VCP, VGD or
VCC) falls below the under-voltage lockout threshold,
device will be disabled, and the microstepping indexer
resets to the home state. Device resumes operation
when all of them go back above their UVLO thresholds.
SG Micro Corp
www.sg-micro.com
MAY 2023
12
SGM42630
Stepper Motor Driver IC
APPLICATION INFORMATION
Figure 7 shows a typical system application circuit of the SGM42630 for driving a bipolar stepper motor with the
design requirements given in Table 4.
VM
VCC
VCC
CP2
CP1
VCP
VMA
0.1μF/50V
0.1μF/50V
0.1μF
VM
0.22μF/50V
VMB
VM
VM
USM1
USM0
nHOME
DIR
+
0.22μF
0.22μF
100μF
VGD
AOUT1
+
Stepper
Motor
nRESETSGM42630
nSR
AOUT2
ISENA
100mΩ
100mΩ
+
-
nSLEEP
nENABLE
STEP
ISENB
BOUT1
BOUT2
VCC
10kΩ
10kΩ
VCC
DECAY
RCA
10kΩ
10kΩ
0.1μF
1000pF
VREF
GND
47kΩ
RCB
1000pF
47kΩ
Figure 7. Typical Application Schematic
mechanical speed limits for startup and running that are
controlled by step frequency. Moreover, there are
maximum torque limits (for acceleration or deceleration)
that are mainly controlled by current. So, proper
acceleration and stepping profiles must be considered
in the controller to match the application needs. Using
the SGM42630 as driver, the controller can set the nm
using USM0 and USM1 inputs.
Table 4. Design Parameters
Design Parameter
Power Supply Voltage, VM
Motor Winding Resistance, RL
Motor Winding Inductance, IL
Motor Full Step Angle, θstep
Target Microstepping Level, nm
Target Motor Speed, v
Example Value
24V
4.0Ω
3.7mH
1.8°/step
8 micro-steps/step
120rpm
Equation 5 gives the required step frequency (fSTEP) to
run a motor with the rotational speed v (rpm), when nm
micro-step/step is used for a motor with a full step
angle of θstep degrees per step (°/step):
Target Full-Scale Current, IFS
1.25A
Detailed Design Procedure
Rotation speed (rpm) and micro-step/step number (nm)
determine the pulse frequency needed for the SGM42630
driver. If a constant speed is required, a pulse
sequence with frequency of fSTEP should be applied to
the STEP pin. A high micro-step/step number results in
smoother motion, low vibration and audible noise. The
drawbacks of the high nm number are higher switching
losses due to higher fSTEP needed and less torque in the
motor plus the risk of motor stall if torque/speed
requirements are not considered. Motors have different
µsteps
v rpm ×360 °/Rotation ×n
(
)
(
)
m
step
µsteps
sec
fSTEP Hz =
=
(5)
(
)
60 sec/min × θ
°/step
(
)
(
)
step
For this application, the required step frequency for
speed of 120rpm (2 turns/sec) will be:
120×360×8
(6)
fSTEP
=
= 3200Hz
60×1.8
SG Micro Corp
www.sg-micro.com
MAY 2023
13
SGM42630
Stepper Motor Driver IC
APPLICATION INFORMATION (continued)
The power supply inductance causes drops and
oscillation on VM line if the local bulk capacitance is
insufficient.
Current Regulation Setting
The full-scale current (IFS) is the maximum current that
can be driven through each winding. As explained in
the current regulation section, with VREF analog voltage
input and RSENSE sense resistor, the full scale current is
given by Equation 7.
Motor datasheets generally advise for the capacitance
value, however, it is recommended to do a system level
test to size the bulk capacitors properly.
VREF(V)
VREF(V)
IFS(A) =
=
(7)
AV ×RSENSE(Ω) 8×RSENSE(Ω)
VM
where AV = 8 is the internal current sense gain of the
SGM42630 applied on the shunt resistor voltage before
reaching the comparator. Winding inductance and the
total driving path resistance (winding, H-bridge switches
and RSENSE) determine the time constant (L/R) of the
winding that along with the motor supply voltage (VM)
determines the rise and fall times of the winding current
during a PWM pulse. IFS defines the maximum current
chopping threshold (ITRIP). Note that the chopping
frequency is higher and independent of the step
frequency that determines the mechanical speed of the
rotor.
Motor
Driver
Power
Supply
Parasitic Wire
Inductance
Bulk
+
Capacitor
Bypass
Capacitor
GND
Motor Driver System
Figure 8. Example Set-Up of Motor Drive System with
External Power Supply
Capacitor voltage rating should be considered well
higher than the operating voltage, to provide enough
margin when the energy transfer is reversed from
motor windings back to the VM supply line and they get
charged by the driver.
Bulk and Decoupling Capacitance on
Motor Supply
To achieve small voltage ripple and decouple the
impact of supply line inductances from interfering with
the system operation, bulk local capacitance near the
motor driver (VM supply) is needed as shown in Figure
8. Also, to decouple switching currents of the H-bridges,
small high frequency decoupling capacitor is
recommended between VMx and GND pins.
To select the local capacitance, several factors should
be considered including the following:
Maximum current needed by the motor.
Supply capacitance and current sourcing capability.
Parasitic inductance of supply lines.
Acceptable voltage ripple.
Motor parameters and required acceleration.
SG Micro Corp
www.sg-micro.com
MAY 2023
14
SGM42630
Stepper Motor Driver IC
REVISION HISTORY
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
MAY 2023 ‒ REV.A.4 to REV.B
Page
Updated Auto-Decay Mode section....................................................................................................................................................................10
JUNE 2022 ‒ REV.A.3 to REV.A.4
Page
Updated Electrical Characteristics section...........................................................................................................................................................4
Updated Detailed Description section................................................................................................................................................................10
JANUARY 2022 ‒ REV.A.2 to REV.A.3
Page
Updated Timing Parameters and Requirements section ......................................................................................................................................5
OCTOBER 2021 ‒ REV.A.1 to REV.A.2
Page
Updated Typical Performance Characteristics section.........................................................................................................................................7
Updated Detailed Description section................................................................................................................................................................11
Updated Package Outline Dimensions section ..................................................................................................................................................17
JANUARY 2021 ‒ REV.A to REV.A.1
Page
Updated Absolute Maximum Ratings section.......................................................................................................................................................2
Changes from Original (DECEMBER 2019) to REV.A
Page
Changed from product preview to production data.............................................................................................................................................All
SG Micro Corp
www.sg-micro.com
MAY 2023
15
PACKAGE INFORMATION
PACKAGE OUTLINE DIMENSIONS
TSSOP-28 (Exposed Pad)
D
D1
5.5
E1
E2
E
2.6
5.94
1.78
b
e
0.42
0.65
RECOMMENDED LAND PATTERN (Unit: mm)
L1
A
A1
θ
L
c
A2
Dimensions
In Millimeters
Dimensions
In Inches
Symbol
MIN
MAX
MIN
MAX
0.047
0.006
0.041
0.012
0.008
0.386
0.224
0.177
0.110
0.260
A
A1
A2
b
1.200
0.150
1.050
0.300
0.200
9.800
5.700
4.500
2.800
6.600
0.050
0.800
0.190
0.090
9.600
5.300
4.300
2.400
6.200
0.002
0.031
0.007
0.004
0.378
0.209
0.169
0.094
0.244
c
D
D1
E
E1
E2
e
0.650 BSC
1.000 BSC
0.026 BSC
0.039 BSC
L
L1
θ
0.450
0°
0.750
8°
0.018
0°
0.030
8°
NOTES:
1. Body dimensions do not include mode flash or protrusion.
2. This drawing is subject to change without notice.
3. Reference JEDEC MO-153.
SG Micro Corp
TX00153.001
www.sg-micro.com
PACKAGE INFORMATION
TAPE AND REEL INFORMATION
REEL DIMENSIONS
TAPE DIMENSIONS
P2
P0
W
Q2
Q4
Q2
Q4
Q2
Q4
Q1
Q3
Q1
Q3
Q1
Q3
B0
Reel Diameter
P1
A0
K0
Reel Width (W1)
DIRECTION OF FEED
NOTE: The picture is only for reference. Please make the object as the standard.
KEY PARAMETER LIST OF TAPE AND REEL
Reel Width
Reel
Diameter
A0
B0
K0
P0
P1
P2
W
Pin1
Package Type
W1
(mm)
(mm) (mm) (mm) (mm) (mm) (mm) (mm) Quadrant
TSSOP-28
(Exposed Pad)
13″
17.6
6.80
10.20
1.60
4.0
8.0
2.0
16.0
Q1
SG Micro Corp
TX10000.000
www.sg-micro.com
PACKAGE INFORMATION
CARTON BOX DIMENSIONS
NOTE: The picture is only for reference. Please make the object as the standard.
KEY PARAMETER LIST OF CARTON BOX
Length
(mm)
Width
(mm)
Height
(mm)
Reel Type
Pizza/Carton
13″
386
280
370
5
SG Micro Corp
www.sg-micro.com
TX20000.000
相关型号：
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