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DRV8812
SLVS997G – OCTOBER 2009 – REVISED OCTOBER 2015
DRV8812 Dual-Bridge Motor Controller IC
1 Features
3 Description
•
•
The DRV8812 provides an integrated motor driver
solution for printers, scanners, and other automated
equipment applications. The device has two H-bridge
drivers, and can drive a bipolar stepper motor or two
DC motors. The output driver block for each consists
of N-channel power MOSFET’s configured as full Hbridges to drive the motor windings. The DRV8812 is
capable of driving up to 1.6-A of output current (with
proper heatsinking, at 24 V and 25°C).
1
•
•
•
•
•
•
8.2-V to 45-V Operating Supply Voltage Range
1.6-A Maximum Drive Current at 24 V and
TA = 25°C
Dual H-Bridge Current Control Motor Driver
– Drive a Bipolar Stepper or Two DC Motors
– Four Level Winding Current Control
Multiple Decay Modes
– Mixed Decay
– Slow Decay
– Fast Decay
Industry Standard Parallel Digital Control Interface
Low Current Sleep Mode
Built In 3.3-V Reference Output Small Package
and Footprint
Protection Features
– Overcurrent Protection (OCP)
– Thermal Shutdown (TSD)
– VM Undervoltage Lockout (UVLO)
– Fault Condition Indication Pin (nFAULT)
Internal shutdown functions are provided for over
current protection, short circuit protection, under
voltage lockout and overtemperature.
The DRV8812 is available in a 28-pin HTSSOP
package with PowerPAD™ and in a 28-pin QFN
package PowerPAD™ (Eco-friendly: RoHS & no
Sb/Br).
Device Information(1)
PART NUMBER
DRV8812
2 Applications
•
•
•
•
•
•
•
•
•
A simple parallel digital control interface is compatible
with industry-standard devices. Decay mode is
programmable.
PACKAGE
BODY SIZE (NOM)
HTSSOP (28)
9.70 mm x 4.40 mm
VQFN (28)
5.00 mm x 5.00 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Automatic Teller Machines
Money Handling Machines
Video Security Cameras
Printers
Scanners
Office Automation Machines
Gaming Machines
Factory Automation
Robotics
Simplified Schematic
8.2 V to 45 V
M
1.6 A
ENBL
Decay Mode
Stepper
Stepper
Current Lvl
Motor
Driver
nFAULT
Current
Control
-
Controller
DRV8812
+
PHASE
+
-
1.6 A
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
DRV8812
SLVS997G – OCTOBER 2009 – REVISED OCTOBER 2015
www.ti.com
Table of Contents
1
2
3
4
5
6
7
Features ..................................................................
Applications ...........................................................
Description .............................................................
Revision History.....................................................
Pin Configuration and Functions .........................
Specifications.........................................................
1
1
1
2
3
5
6.1
6.2
6.3
6.4
6.5
6.6
5
5
5
5
6
7
Absolute Maximum Ratings ......................................
ESD Ratings..............................................................
Recommended Operating Conditions.......................
Thermal Information ..................................................
Electrical Characteristics...........................................
Typical Characteristics ..............................................
Detailed Description .............................................. 8
7.1
7.2
7.3
7.4
Overview ................................................................... 8
Functional Block Diagram ......................................... 8
Feature Description................................................... 9
Device Functional Modes........................................ 10
8
Application and Implementation ........................ 13
8.1 Application Information............................................ 13
8.2 Typical Application ................................................. 13
9
Power Supply Recommendations...................... 16
9.1 Bulk Capacitance .................................................... 16
9.2 Power Supply and Logic Sequencing ..................... 16
10 Layout................................................................... 17
10.1 Layout Guidelines ................................................. 17
10.2 Layout Example .................................................... 17
10.3 Thermal Consideration.......................................... 18
11 Device and Documentation Support ................. 19
11.1
11.2
11.3
11.4
11.5
Third-Party Products Disclaimer ...........................
Community Resources..........................................
Trademarks ...........................................................
Electrostatic Discharge Caution ............................
Glossary ................................................................
19
19
19
19
19
12 Mechanical, Packaging, and Orderable
Information ........................................................... 19
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision F (August 2013) to Revision G
•
2
Page
Added Pin Configuration and Functions section, ESD Ratings table, Feature Description section, Device Functional
Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device
and Documentation Support section, and Mechanical, Packaging, and Orderable Information section .............................. 5
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5 Pin Configuration and Functions
PWP Package
28 Pin HTSSOP
Top View
CP1
CP2
VCP
VMA
AOUT1
ISENA
AOUT2
BOUT2
ISENB
BOUT1
VMB
AVREF
BVREF
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
GND
(PPAD)
GND
BI1
BI0
AI1
AI0
BPHASE
BENBL
AENBL
APHASE
DECAY
nFAULT
nSLEEP
nRESET
V3P3OUT
RHD Package
28-Pin VQFN
Top View
DECAY
APHASE
AENBL
BENBL
BPHASE
AI0
AI1
22
23
24
25
26
27
28
BI0
BI1
GND
CP1
CP2
VCP
VMA
1
21
2
20
3
19
GND
(PPAD)
4
18
5
17
6
16
7
15
nFAULT
nSLEEP
nRESET
V3P3OUT
GND
BVREF
AVREF
14
13
12
11
10
9
8
VMB
BOUT1
ISENB
BOUT2
AOUT2
ISENA
AOUT1
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Pin Functions
PIN
NAME
PWP
RHD
I/O (1)
EXTERNAL COMPONENTS
OR CONNECTIONS
DESCRIPTION
POWER AND GROUND
GND
14, 28
3, 17
-
Device ground
VMA
4
7
-
Bridge A power supply
VMB
11
14
-
Bridge B power supply
V3P3OUT
15
18
O
3.3-V regulator output
CP1
1
4
IO
Charge pump flying capacitor
CP2
2
5
IO
Charge pump flying capacitor
VCP
3
6
IO
High-side gate drive voltage
Connect a 0.1-μF 16-V ceramic capacitor and
a 1-MΩ resistor to VM.
AENBL
21
24
I
Bridge A enable
Logic high to enable bridge A
APHASE
20
23
I
Bridge A phase (direction)
Logic high sets AOUT1 high, AOUT2 low
AI0
24
27
I
AI1
25
28
I
Bridge A current set
Sets bridge A current: 00 = 100%,
01 = 71%, 10 = 38%, 11 = 0
BENBL
22
25
I
Bridge B enable
Logic high to enable bridge B
BPHASE
23
26
I
Bridge B phase (direction)
Logic high sets BOUT1 high, BOUT2 low
BI0
26
1
I
BI1
27
2
I
Bridge B current set
Sets bridge B current: 00 = 100%,
01 = 71%, 10 = 38%, 11 = 0
DECAY
19
22
I
Decay mode
Low = slow decay, open = mixed decay,
high = fast decay
nRESET
16
19
I
Reset input
Active-low reset input initializes internal logic
and disables the H-bridge outputs
nSLEEP
17
20
I
Sleep mode input
Logic high to enable device, logic low to enter
low-power sleep mode
AVREF
12
15
I
Bridge A current set reference input
BVREF
13
16
I
Bridge B current set reference input
18
21
OD
Fault
Logic low when in fault condition (overtemp,
overcurrent)
Connect to motor supply (8.2-V to 45-V). Both
pins must be connected to the same supply,
bypassed with a 0.1uF capacitor to GND, and
connected to appropriate bulk capacitance.
Bypass to GND with a 0.47-μF 6.3-V ceramic
capacitor. Can be used to supply VREF.
Connect a 0.01-μF 50-V capacitor between
CP1 and CP2.
CONTROL
Reference voltage for winding current set.
Can be driven individually with an external
DAC for microstepping, or tied to a reference
(e.g., V3P3OUT). A 0.01-µF bypass capacitor
to GND is recommended.
STATUS
nFAULT
OUTPUT
ISENA
6
9
IO
Bridge A ground / Isense
Connect to current sense resistor for bridge A
ISENB
9
12
IO
Bridge B ground / Isense
Connect to current sense resistor for bridge B
AOUT1
5
8
O
Bridge A output 1
AOUT2
7
10
O
Bridge A output 2
BOUT1
10
13
O
Bridge B output 1
BOUT2
8
11
O
Bridge B output 2
(1)
4
Connect to motor winding A
Connect to motor winding B
Directions: I = input, O = output, OZ = tri-state output, OD = open-drain output, IO = input/output
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6 Specifications
6.1 Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted)
VMx
Power supply voltage
VMx
Power supply ramp rate
VREF
(1) (2)
MIN
MAX
UNIT
–0.3
47
V
1
V/µs
Digital pin voltage
–0.5
7
V
Input voltage
–0.3
4
V
0.8
V
ISENSEx pin voltage
(3)
–0.8
Peak motor drive output current, t < 1 μS
Internally limited
Continuous motor drive output current (4)
0
Continuous total power dissipation
A
1.6
A
See Thermal Information
TJ
Operating virtual junction temperature
–40
150
°C
TA
Operating ambient temperature
–40
85
°C
Tstg
Storage temperature
–60
150
°C
(1)
(2)
(3)
(4)
Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating
conditions is not implied. Exposure to absolute–maximum–rated conditions for extended periods may affect device reliability.
All voltage values are with respect to network ground terminal.
Transients of ±1 V for less than 25 ns are acceptable
Power dissipation and thermal limits must be observed.
6.2 ESD Ratings
V(ESD)
(1)
(2)
Electrostatic discharge
VALUE
UNIT
Human body model (HBM), per ANSI/ESDA/JEDEC JS-001, all pins (1)
±2000
V
Charged device model (CDM), per JEDEC specification JESD22-C101,
all pins (2)
±500
V
JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.
6.3 Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted)
MIN
VM
Motor power supply voltage range (1)
VREF
VREF input voltage (2)
IV3P3
V3P3OUT load current
(1)
(2)
NOM
MAX
UNIT
8.2
45
V
1
3.5
V
1
mA
All VM pins must be connected to the same supply voltage.
Operational at VREF between 0 V and 1 V, but accuracy is degraded.
6.4 Thermal Information
DRV8812
THERMAL METRIC (1)
PWP
(HTSSOP)
RHD
(VQFN)
UNIT
28 PINS
28 PINS
RθJA
Junction-to-ambient thermal resistance
38.9
35.8
°C/W
RθJC(top)
Junction-to-case (top) thermal resistance
23.3
25.1
°C/W
RθJB
Junction-to-board thermal resistance
21.2
8.2
°C/W
ψJT
Junction-to-top characterization parameter
0.8
0.3
°C/W
ψJB
Junction-to-board characterization parameter
20.9
8.2
°C/W
RθJC(bot)
Junction-to-case (bottom) thermal resistance
2.6
1.1
°C/W
(1)
For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application
report, SPRA953.
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6.5 Electrical Characteristics
over operating free-air temperature range (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
POWER SUPPLIES
IVM
VM operating supply current
VM = 24 V, fPWM < 50 kHz
5
8
mA
IVMQ
VM sleep mode supply current
VM = 24 V
10
20
μA
VUVLO
VM undervoltage lockout voltage
VM rising
7.8
8.2
V
V3P3OUT REGULATOR
V3P3
V3P3OUT voltage
IOUT = 0 to 1 mA, VM = 24 V, TJ = 25°C
3.18
3.30
3.42
V
IOUT = 0 to 1 mA
3.10
3.30
3.50
V
LOGIC-LEVEL INPUTS
VIL
Input low voltage
VIH
Input high voltage
0.6
0.7
V
5.25
V
VHYS
Input hysteresis
IIL
Input low current
VIN = 0
20
μA
IIH
Input high current
VIN = 3.3 V
100
μA
0.5
V
1
μA
0.8
V
±40
µA
2
0.45
–20
V
nFAULT OUTPUT (OPEN-DRAIN OUTPUT)
VOL
Output low voltage
IO = 5 mA
IOH
Output high leakage current
VO = 3.3 V
DECAY INPUT
VIL
Input low threshold voltage
For slow decay mode
0
VIH
Input high threshold voltage
For fast decay mode
2
IIN
Input current
V
H-BRIDGE FETS
RDS(ON)
HS FET on resistance
RDS(ON)
LS FET on resistance
IOFF
Off-state leakage current
VM = 24 V, I O = 1 A, TJ = 25°C
0.63
VM = 24 V, IO = 1 A, TJ = 85°C
0.76
VM = 24 V, IO = 1 A, TJ = 25°C
0.65
VM = 24 V, IO = 1 A, TJ = 85°C
0.78
–20
Ω
0.90
Ω
Ω
0.90
Ω
20
μA
MOTOR DRIVER
fPWM
Internal PWM frequency
tBLANK
Current sense blanking time
50
tR
Rise time
VM = 24 V
100
tF
Fall time
VM = 24 V
80
tDEAD
Dead time
tDEG
Input deglitch time
kHz
μs
3.75
360
ns
250
ns
2.9
µs
400
1.3
ns
PROTECTION CIRCUITS
IOCP
Overcurrent protection trip level
tTSD
Thermal shutdown temperature
1.8
Die temperature
150
5
A
160
180
°C
CURRENT CONTROL
IREF
xVREF input current
VTRIP
xISENSE trip voltage
AISENSE
Current sense amplifier gain
6
3
μA
xVREF = 3.3 V, 100% current setting
635
660
685
mV
xVREF = 3.3 V, 71% current setting
445
469
492
mV
xVREF = 3.3 V, 38% current setting
225
251
276
xVREF = 3.3 V
Reference only
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–3
5
mV
V/V
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6.6 Typical Characteristics
14
7.0
13
6.5
12
IVMQ ( A)
IVM (mA)
6.0
5.5
5.0
11
10
9
-40°C
8
25°C
4.5
85°C
125°C
4.0
10
15
20
25
30
35
40
V(VMx) (V)
25°C
85°C
7
125°C
6
45
10
15
-40°C
85°C
30
35
40
45
C002
Figure 2. IVMxQ vs V(VMx)
2000
25°C
125°C
10 V
24 V
1800
RDS(ON) HS + LS (mŸ)
1800
RDS(ON) HS + LS (mŸ)
25
V(VMx) (V)
Figure 1. IVMx vs V(VMx)
2000
20
C001
1600
1400
1200
45 V
1600
1400
1200
1000
1000
800
800
10
15
20
25
30
35
V(VMx) (V)
40
45
±50
C003
±25
0
25
50
75
100
TA (ƒC)
125
C004
Figure 4. RDS(ON) vs Temperature
Figure 3. RDS(ON) vs V(VMx)
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7 Detailed Description
7.1 Overview
The DRV8812 is an integrated motor driver solution for a bipolar stepper motor or two brushed DC motors. The
device integrates two NMOS H-bridges, current sense, regulation circuitry, and detailed fault detection. The
DRV8813 can be powered with a supply voltage between 8.2 V and 45 V and is capable of providing an output
current up to 1.6 A full-scale.
A PHASE/ENBL interface allows for simple interfacing to the controller circuit. The winding current control allows
the external controller to adjust the regulated current that is provided to the motor. The current regulation is
highly configurable, with three decay modes of operation. Fast, slow, and mixed decay can be selected
depending on the application requirements.
A low-power sleep mode is included which allows the system to save power when not driving the motor.
7.2 Functional Block Diagram
VM
VM
CP1
Int. VCC
Internal
Reference &
LS Gate
Regs
Drive
V3P3OUT
0.01mF
CP2
VM
Charge
Pump
3.3V
VCP
3.3V
0.1mF
Thermal
HS Gate
Drive
Shut down
1MW
VM
VMA
AVREF
BVREF
AOUT1
+
APHASE
Step
Motor
DCM
Driver A
AENBL
Motor
-
AOUT2
AI0
+
ISENA
AI1
-
BPHASE
BENBL
BI0
Control
VM
Logic
VMB
BI1
DECAY
BOUT1
Motor
nRESET
Driver B
BOUT2
nFAULT
ISENB
GND
8
DCM
nSLEEP
GND
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7.3 Feature Description
7.3.1 PWM Motor Drivers
The DRV8812 contains two H-bridge motor drivers with current-control PWM circuitry. A block diagram of the
motor control circuitry is shown in Figure 5. A bipolar stepper motor is shown, but the drivers can also drive two
separate DC motors.
Figure 5. Motor Control Circuitry
Note that there are multiple VM motor power supply pins. All VM pins must be connected together to the motor
supply voltage.
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7.4 Device Functional Modes
7.4.1 Bridge Control
The xPHASE input pins control the direction of current flow through each H-bridge. The xENBL input pins enable
the H-bridge outputs when active high. Table 1 shows the logic.
Table 1. H-Bridge Logic
xENBL
xPHASE
xOUT1
xOUT2
0
X
Z
Z
1
1
H
L
1
0
L
H
7.4.2 Current Regulation
The current through the motor windings is regulated by a fixed-frequency PWM current regulation, or current
chopping. When an H-bridge is enabled, current rises through the winding at a rate dependent on the DC voltage
and inductance of the winding. Once the current hits the current chopping threshold, the bridge disables the
current until the beginning of the next PWM cycle.
For stepping motors, current regulation is normally used at all times, and can changing the current can be used
to microstep the motor. For DC motors, current regulation is used to limit the start-up and stall current of the
motor.
The PWM chopping current is set by a comparator which compares the voltage across a current sense resistor
connected to the xISEN pins, multiplied by a factor of 5, with a reference voltage. The reference voltage is input
from the xVREF pins, and is scaled by a 2-bit DAC that allows current settings of 100%, 71%, 38% of full-scale,
plus zero.
The full-scale (100%) chopping current is calculated in Equation 1.
VREFX
ICHOP
5 u RISENSE
(1)
Example:
If a 0.5-Ω sense resistor is used and the VREFx pin is 3.3 V, the full-scale (100%) chopping current will be
3.3 V / (5 x 0.5 Ω) = 1.32 A.
Two input pins per H-bridge (xI1 and xI0) are used to scale the current in each bridge as a percentage of the fullscale current set by the VREF input pin and sense resistance. The function of the pins is shown in
Table 2.
Table 2. H-Bridge Pin Functions
xI1
xI0
RELATIVE CURRENT
(% FULL-SCALE CHOPPING CURRENT)
1
1
0% (Bridge disabled)
1
0
38%
0
1
71%
0
0
100%
Note that when both xI bits are 1, the H-bridge is disabled and no current flows.
Example:
If a 0.5-Ω sense resistor is used and the VREF pin is 3.3 V, the chopping current will be 1.32 A at the 100%
setting (xI1, xI0 = 00). At the 71% setting (xI1, xI0 = 01) the current will be 1.32 A x 0.71 = 0.937 A, and at
the 38% setting (xI1, xI0 = 10) the current will be 1.32 A x 0.38 = 0.502 A. If (xI1, xI0 = 11) the bridge will be
disabled and no current will flow.
10
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7.4.3 Decay Mode
During PWM current chopping, the H-bridge is enabled to drive current through the motor winding until the PWM
current chopping threshold is reached. This is shown in Figure 6 as case 1. The current flow direction shown
indicates the state when the xENBL pin is high.
Once the chopping current threshold is reached, the H-bridge can operate in two different states, fast decay or
slow decay.
In fast decay mode, once the PWM chopping current level has been reached, the H-bridge reverses state to
allow winding current to flow in a reverse direction. As the winding current approaches zero, the bridge is
disabled to prevent any reverse current flow. Fast decay mode is shown in Figure 6 as case 2.
In slow decay mode, winding current is re-circulated by enabling both of the low-side FETs in the bridge. This is
shown in Figure 6 as case 3.
Figure 6. Decay Mode
The DRV8812 supports fast decay, slow decay and a mixed decay mode. Slow, fast, or mixed decay mode is
selected by the state of the DECAY pin - logic low selects slow decay, open selects mixed decay operation, and
logic high sets fast decay mode. Note that the DECAY pin sets the decay mode for both H-bridges.
Mixed decay mode begins as fast decay, but at a fixed period of time (75% of the PWM cycle) switches to slow
decay mode for the remainder of the fixed PWM period.
7.4.4 Blanking Time
After the current is enabled in an H-bridge, the voltage on the xISEN pin is ignored for a fixed period of time
before enabling the current sense circuitry. This blanking time is fixed at 3.75 μs. Note that the blanking time also
sets the minimum on time of the PWM.
7.4.5 nRESET and nSLEEP Operation
The nRESET pin, when driven active low, resets the internal logic. It also disables the H-bridge drivers. All inputs
are ignored while nRESET is active.
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Driving nSLEEP low will put the device into a low power sleep state. In this state, the H-bridges are disabled, the
gate drive charge pump is stopped, the V3P3OUT regulator is disabled, and all internal clocks are stopped. In
this state all inputs are ignored until nSLEEP returns inactive high. When returning from sleep mode, some time
(approximately 1 ms) needs to pass before the motor driver becomes fully operational.
7.4.6 Protection Circuits
The DRV8812 is fully protected against undervoltage, overcurrent and overtemperature events.
7.4.6.1 Overcurrent Protection (OCP)
An analog current limit circuit on each FET limits the current through the FET by removing the gate drive. If this
analog current limit persists for longer than the OCP time, all FETs in the H-bridge will be disabled and the
nFAULT pin will be driven low. The device will remain disabled until either nRESET pin is applied, or VM is
removed and re-applied.
Overcurrent conditions on both high and low side devices; i.e., a short to ground, supply, or across the motor
winding will all result in an overcurrent shutdown. Note that overcurrent protection does not use the current sense
circuitry used for PWM current control, and is independent of the ISENSE resistor value or VREF voltage.
7.4.6.2 Thermal Shutdown (TSD)
If the die temperature exceeds safe limits, all FETs in the H-bridge will be disabled and the nFAULT pin will be
driven low. Once the die temperature has fallen to a safe level operation will automatically resume.
7.4.6.3 Undervoltage Lockout (UVLO)
If at any time the voltage on the VM pins falls below the undervoltage lockout threshold voltage, all circuitry in the
device will be disabled and internal logic will be reset. Operation will resume when VM rises above the UVLO
threshold.
12
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8 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
8.1 Application Information
The DRV8812 can be used to control a bipolar stepper motor. The PHASE/ENBL interface controls the outputs
and current control can be implemented with the internal current regulation circuitry. Detailed fault reporting is
provided with the internal protection circuits and nFAULT pin.
8.2 Typical Application
DRV8812
CP1
GND
CP2
BI1
VCP
BI0
VMA
AI1
AOUT1
AI0
0.01uF
1MŸ
0.1uF
+
0.01uF
400mŸ
BPHASE
ISENA
Stepper Motor
-
VM
100uF
+
+
AOUT2
BENBL
BOUT2
AENBL
-
400mŸ
ISENB
APHASE
V3P3OUT
BOUT1
DECAY
VMB
nFAULT
AVREF
nSLEEP
BVREF
nRESET
10kŸ
V3P3OUT
10kŸ
30kŸ
GND
PPAD
0.01uF
V3P3OUT
V3P3OUT
0.47uF
Figure 7. Typical Application Schematic
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Typical Application (continued)
8.2.1 Design Requirements
Table 3. Design Parameters
REFERENCE
VALUE
Supply voltage
PARAMETER
VM
24 V
Motor winding
resistance
RL
3.9 Ω
Motor winding
inductance
IL
2.9 mH
Sense resistor
value
RSENSE
400 mΩ
IFS
1.25 A
Target full-scale
current
8.2.2 Detailed Design Procedure
8.2.2.1 Current Regulation
In a stepper motor, the set full-scale current (IFS) is the maximum current driven through either winding. This
quantity depends on the xVREF analog voltage and the sense resistor value (RSENSE). During stepping, IFS
defines the current chopping threshold (ITRIP) for the maximum current step. The gain of DRV8812 is set for 5
V/V.
xVREF(V)
xVREF(V)
IFS (A)
A v u RSENSE (:) 5 u RSENSE (:)
(2)
To achieve IFS = 1.25 A with RSENSE of 0.2 Ω, xVREF should be 1.25 V.
8.2.2.2 Decay Modes
The DRV8812 supports three different decay modes: slow decay, fast decay, and mixed decay. The current
through the motor windings is regulated using a fixed-frequency PWM scheme. This means that after any drive
phase, when a motor winding current has hit the current chopping threshold (ITRIP), the DRV8812 will place the
winding in one of the three decay modes until the PWM cycle has expired. Afterward, a new drive phase starts.
The blanking time, tBLANK, defines the minimum drive time for the current chopping. ITRIP is ignored during tBLANK,
so the winding current may overshoot the trip level.
8.2.2.3 Sense Resistor
For optimal performance, it is important for the sense resistor to be:
• Surface-mount
• Low inductance
• Rated for high enough power
• Placed closely to the motor driver
The power dissipated by the sense resistor equals Irms2 x R. For example, if the rms motor current is 2-A and a
100-m Ω sense resistor is used, the resistor will dissipate 2 A ² × 0.1 Ω = 0.4 W. The power quickly increases
with greater current levels.
Resistors typically have a rated power within some ambient temperature range, along with a de-rated power
curve for high ambient temperatures. When a PCB is shared with other components generating heat, margin
should be added. It is always best to measure the actual sense resistor temperature in a final system, along with
the power MOSFETs, as those are often the hottest components.
Because power resistors are larger and more expensive than standard resistors, it is common practice to use
multiple standard resistors in parallel, between the sense node and ground. This distributes the current and heat
dissipation.
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8.2.3 Application Curves
Figure 8. DRV8828 Current Limiting
Figure 9. DRV8828 Direction Change
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9 Power Supply Recommendations
The DRV8812 is designed to operate from an input voltage supply (VMx) range between 8.2 and 45 V. Two
0.1-µF ceramic capacitors rated for VMx must be placed as close as possible to the VMA and VMB pins
respectively (one on each pin). In addition to the local decoupling caps, additional bulk capacitance is required
and must be sized accordingly to the application requirements.
9.1 Bulk Capacitance
Bulk capacitance sizing is an important factor in motor drive system design. It is dependent on a variety of factors
including:
• Type of power supply
• Acceptable supply voltage ripple
• Parasitic inductance in the power supply wiring
• Type of motor (brushed DC, brushless DC, stepper)
• Motor startup current
• Motor braking method
The inductance between the power supply and motor drive system will limit the rate current can change from the
power supply. If the local bulk capacitance is too small, the system will respond to excessive current demands or
dumps from the motor with a change in voltage. You should size the bulk capacitance to meet acceptable
voltage ripple levels.
The data sheet generally provides a recommended value but system level testing is required to determine the
appropriate sized bulk capacitor.
Parasitic Wire
Inductance
Motor Drive System
Power Supply
VM
+
–
Motor
Motor
Driver
Driver
+
GND
Local
Bulk Capacitor
IC Bypass
Capacitor
Figure 10. Setup of Motor Drive System With External Power Supply
9.2 Power Supply and Logic Sequencing
There is no specific sequence for powering-up the DRV8812. It is okay for digital input signals to be present
before VMx is applied. After VMx is applied to the DRV8812, it begins operation based on the status of the
control pins.
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10 Layout
10.1 Layout Guidelines
The VMA and VMB pins should be bypassed to GND using low-ESR ceramic bypass capacitors with a
recommended value of 0.1-μF rated for VMx. This capacitor should be placed as close to the VMA and VMB pins
as possible with a thick trace or ground plane connection to the device GND pin.
The VMA and VMB pins must be bypassed to ground using an appropriate bulk capacitor. This component may
be an electrolytic and should be located close to the DRV8812.
A low-ESR ceramic capacitor must be placed in between the CPL and CPH pins. TI recommends a value of
0.01-μF rated for VMx. Place this component as close to the pins as possible.
A low-ESR ceramic capacitor must be placed in between the VMA and VCP pins. TI recommends a value of 0.1μF rated for 16 V. Place this component as close to the pins as possible. Also, place a 1-MΩ resistor between
VCP and VMA.
Bypass V3P3 to ground with a ceramic capacitor rated 6.3 V. Place this bypass capacitor as close to the pin as
possible
10.2 Layout Example
0.1 µF
CP1
GND
CP2
BI1
0.01 µF
1 0Ÿ
VCP
BI0
VMA
AI1
AOUT1
AI0
ISENA
BPHASE
AOUT2
BENBL
0.1 µF
RISENA
RISENB
BOUT2
AENBL
ISENB
APHASE
BOUT1
DECAY
VMB
nFAULT
AVREF
nSLEEP
+
0.1 µF
BVREF
nRESET
GND
V3P3OUT
0.47 µF
Figure 11. DRV8812 Layout Example
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10.3 Thermal Consideration
10.3.1 Thermal Protection
The DRV8812 has thermal shutdown (TSD) as described above. If the die temperature exceeds approximately
150°C, the device will be disabled until the temperature drops to a safe level.
Any tendency of the device to enter TSD is an indication of either excessive power dissipation, insufficient
heatsinking, or too high an ambient temperature.
10.3.2 Power Dissipation
Power dissipation in the DRV8812 is dominated by the power dissipated in the output FET resistance, or RDS(ON).
Average power dissipation when running a stepper motor can be roughly estimated by Equation 3.
PTOT
4 u RDS(ON) u IOUT(RMS)
2
(3)
where PTOT is the total power dissipation, RDS(ON) is the resistance of each FET, and IOUT(RMS) is the RMS output
current being applied to each winding. IOUT(RMS) is equal to the approximately 0.7x the full-scale output current
setting. The factor of 4 comes from the fact that there are two motor windings, and at any instant two FETs are
conducting winding current for each winding (one high-side and one low-side).
The maximum amount of power that can be dissipated in the device is dependent on ambient temperature and
heatsinking.
Note that RDS(ON) increases with temperature, so as the device heats, the power dissipation increases. This must
be taken into consideration when sizing the heatsink.
10.3.3 Heatsinking
The PowerPAD™ package uses an exposed pad to remove heat from the device. For proper operation, this pad
must be thermally connected to copper on the PCB to dissipate heat. On a multi-layer PCB with a ground plane,
this can be accomplished by adding a number of vias to connect the thermal pad to the ground plane. On PCBs
without internal planes, copper area can be added on either side of the PCB to dissipate heat. If the copper area
is on the opposite side of the PCB from the device, thermal vias are used to transfer the heat between top and
bottom layers.
For details about how to design the PCB, refer to TI application report SLMA002, "PowerPAD™ Thermally
Enhanced Package" and TI application brief SLMA004, "PowerPAD™ Made Easy", available at www.ti.com.
In general, the more copper area that can be provided, the more power can be dissipated.
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11 Device and Documentation Support
11.1 Third-Party Products Disclaimer
TI'S PUBLICATION OF INFORMATION REGARDING THIRD-PARTY PRODUCTS OR SERVICES DOES NOT
CONSTITUTE AN ENDORSEMENT REGARDING THE SUITABILITY OF SUCH PRODUCTS OR SERVICES
OR A WARRANTY, REPRESENTATION OR ENDORSEMENT OF SUCH PRODUCTS OR SERVICES, EITHER
ALONE OR IN COMBINATION WITH ANY TI PRODUCT OR SERVICE.
11.2 Community Resources
The following links connect to TI community resources. Linked contents are provided "AS IS" by the respective
contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of
Use.
TI E2E™ Online Community TI's Engineer-to-Engineer (E2E) Community. Created to foster collaboration
among engineers. At e2e.ti.com, you can ask questions, share knowledge, explore ideas and help
solve problems with fellow engineers.
Design Support TI's Design Support Quickly find helpful E2E forums along with design support tools and
contact information for technical support.
11.3 Trademarks
PowerPAD, E2E are trademarks of Texas Instruments.
All other trademarks are the property of their respective owners.
11.4 Electrostatic Discharge Caution
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
11.5 Glossary
SLYZ022 — TI Glossary.
This glossary lists and explains terms, acronyms, and definitions.
12 Mechanical, Packaging, and Orderable Information
The following pages include mechanical, packaging, and orderable information. This information is the most
current data available for the designated devices. This data is subject to change without notice and revision of
this document. For browser-based versions of this data sheet, refer to the left-hand navigation.
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PACKAGE OPTION ADDENDUM
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12-Jun-2015
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
Lead/Ball Finish
MSL Peak Temp
(2)
(6)
(3)
Op Temp (°C)
Device Marking
(4/5)
DRV8812PWP
ACTIVE
HTSSOP
PWP
28
50
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
-40 to 85
DRV8812
DRV8812PWPR
ACTIVE
HTSSOP
PWP
28
2000
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
-40 to 85
DRV8812
DRV8812RHDR
ACTIVE
VQFN
RHD
28
3000
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-2-260C-1 YEAR
-40 to 85
DRV8812
DRV8812RHDT
ACTIVE
VQFN
RHD
28
250
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-2-260C-1 YEAR
-40 to 85
DRV8812
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability
information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that
lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between
the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight
in homogeneous material)
(3)
MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
(4)
There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.
(5)
Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation
of the previous line and the two combined represent the entire Device Marking for that device.
(6)
Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish
value exceeds the maximum column width.
Addendum-Page 1
Samples
PACKAGE OPTION ADDENDUM
www.ti.com
12-Jun-2015
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
Addendum-Page 2
PACKAGE MATERIALS INFORMATION
www.ti.com
26-Feb-2019
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device
Package Package Pins
Type Drawing
SPQ
Reel
Reel
A0
Diameter Width (mm)
(mm) W1 (mm)
B0
(mm)
K0
(mm)
P1
(mm)
W
Pin1
(mm) Quadrant
DRV8812PWPR
HTSSOP
PWP
28
2000
330.0
16.4
6.9
10.2
1.8
12.0
16.0
Q1
DRV8812RHDR
VQFN
RHD
28
3000
330.0
DRV8812RHDT
VQFN
RHD
28
250
180.0
12.4
5.3
5.3
1.1
8.0
12.0
Q2
12.4
5.3
5.3
1.1
8.0
12.0
Q2
Pack Materials-Page 1
PACKAGE MATERIALS INFORMATION
www.ti.com
26-Feb-2019
*All dimensions are nominal
Device
Package Type
Package Drawing
Pins
SPQ
Length (mm)
Width (mm)
Height (mm)
DRV8812PWPR
HTSSOP
PWP
28
2000
350.0
350.0
43.0
DRV8812RHDR
VQFN
RHD
28
3000
367.0
367.0
35.0
DRV8812RHDT
VQFN
RHD
28
250
210.0
185.0
35.0
Pack Materials-Page 2
GENERIC PACKAGE VIEW
PWP 28
TM
PowerPAD TSSOP - 1.2 mm max height
SMALL OUTLINE PACKAGE
4.4 x 9.7, 0.65 mm pitch
Images above are just a representation of the package family, actual package may vary.
Refer to the product data sheet for package details.
4224765/A
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