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STEP

Step Size

Decay Mode

2.5 V to 10.8 V

Controller

+ -

DRV8834

1/32 µstep

Stepper

Motor

Driver

1.5

DIR

nFAULT

Product

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Buy

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Documents

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DRV8834

SLVSB19D –FEBRUARY 2012–REVISED MARCH 2015

DRV8834 Dual-Bridge Stepper or DC Motor Driver

1 Features 3 Description

The DRV8834 provides a flexible motor driver

• Dual-H-Bridge Current-Control Motor Driver

solution for toys, printers, cameras, and other

– Capable of Driving Two DC Motors or One

mechatronic applications. The device has two H-

Stepper Motor

bridge drivers, and is intended to drive a bipolar

• Two Control Modes:

stepper motor or two DC motors.

– Built-In Indexer Logic With Simple

The output driver block of each H-bridge consists of

STEP/DIRECTION Control and Up to

N-channel power MOSFETs configured as an H-

1/32-Step Microstepping

bridge to drive the motor windings. Each H-bridge

includes circuitry to regulate or limit the winding

– PHASE/ENABLE Control, With the Ability to

current.

Drive External References for > 1/32-Step

Microstepping

With proper PCB design, each H-bridge of the

DRV8834 can driving up to 1.5-A RMS (or DC)

• Output Current 1.5-A Continuous, 2.2-A Peak per

continuously, at 25°C with a V

supply of 5 V. The

H-Bridge (at V

= 5 V, 25°C)

device can support peak currents of up to 2.2 A per

• Low R

DS(ON)

: 305-mΩ HS + LS

bridge. Current capability is reduced slightly at lower

(at V

= 5 V, 25°C)

voltages.

• Wide Power Supply Voltage Range:

Internal shutdown functions with a fault output pin are

2.5 V to 10.8 V

provided for overcurrent protection, short-circuit

• Dynamic t

BLANK

and Mixed Decay Modes for

protection, undervoltage lockout and

Smooth Microstepping

overtemperature. A low-power sleep mode is also

provided.

• PWM Winding Current Regulation and Limiting

• Thermally Enhanced Surface-Mount Package

The DRV8834 is packaged in a 24-pin HTSSOP or

VQFN package with PowerPAD™ (Eco-friendly:

RoHS & no Sb/Br).

2 Applications

• Battery-Powered Toys

Device Information

(1)

• POS Printers

PART NUMBER PACKAGE BODY SIZE (NOM)

• Video Security Cameras

HTSSOP (24) 7.80 mm × 4.40 mm

DRV8834

• Office Automation Machines

VQFN (24) 4.00 mm × 4.00 mm

• Gaming Machines

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

• Robotics

4 Simplified Schematic

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.

Summary of content (43 pages)

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Product Folder Sample & Buy Support & Community Tools & Software Technical Documents DRV8834 SLVSB19D – FEBRUARY 2012 – REVISED MARCH 2015 DRV8834 Dual-Bridge Stepper or DC Motor Driver 1 Features 3 Description • The DRV8834 provides a flexible motor driver solution for toys, printers, cameras, and other mechatronic applications. The device has two Hbridge drivers, and is intended to drive a bipolar stepper motor or two DC motors.
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DRV8834 SLVSB19D – FEBRUARY 2012 – REVISED MARCH 2015 www.ti.com Table of Contents 1 2 3 4 5 6 7 8 Features .................................................................. Applications ........................................................... Description ............................................................. Simplified Schematic............................................. Revision History..................................................... Pin Configuration and Functions ..................
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DRV8834 www.ti.
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DRV8834 SLVSB19D – FEBRUARY 2012 – REVISED MARCH 2015 www.ti.com Pin Functions (continued) PIN NAME M0/APHASE M1 HTSSOP 13 14 VQFN 10 11 I/O I I EXTERNAL COMPONENTS OR CONNECTIONS DESCRIPTION Microstep mode/Bridge A phase Indexer mode: Controls microstep mode (full, half, up to 1/32-step) along with M1. Phase/enable mode: Logic high sets AOUT1 high, AOUT2 low. Internal pulldown. Microstep mode/Disable state Indexer mode: Controls microstep mode (full, half, up to 1/32-step) along with M0.
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DRV8834 www.ti.com SLVSB19D – FEBRUARY 2012 – REVISED MARCH 2015 7 Specifications 7.1 Absolute Maximum Ratings over operating free-air temperature range (unless otherwise noted) (1) (2) VM MIN MAX UNIT –0.3 11.8 V –0.5 3.6 V Digital input pin voltage –0.5 7 V xISEN pin voltage –0.3 0.
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DRV8834 SLVSB19D – FEBRUARY 2012 – REVISED MARCH 2015 www.ti.com 7.4 Thermal Information DRV8834 THERMAL METRIC (1) PWP [HTSSOP] RGE [VQFN] 24 PINS 24 PINS RθJA Junction-to-ambient thermal resistance 40.2 35.1 RθJC(top) Junction-to-case (top) thermal resistance 23.7 36.6 RθJB Junction-to-board thermal resistance 21.9 12.2 ψJT Junction-to-top characterization parameter 0.7 0.6 ψJB Junction-to-board characterization parameter 21.7 12.
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DRV8834 www.ti.com SLVSB19D – FEBRUARY 2012 – REVISED MARCH 2015 7.5 Electrical Characteristics TA = 25°C, over operating free-air temperature range (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX VM = 5 V, excluding winding current 2.4 4 VM = 10 V, excluding winding current 2.75 UNIT POWER SUPPLY IVM VM operating supply current IVMQ VM sleep mode supply current VUVLO VM undervoltage lockout voltage VM = 5 V 0.6 VM = 10 V 9.6 VM falling 2 mA μA 2.
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DRV8834 SLVSB19D – FEBRUARY 2012 – REVISED MARCH 2015 www.ti.com Electrical Characteristics (continued) TA = 25°C, over operating free-air temperature range (unless otherwise noted) PARAMETER tTSD TEST CONDITIONS Thermal shutdown temperature Die temperature MIN TYP MAX UNIT 150 160 180 °C 1 µA CURRENT CONTROL IREF VREF input current VREF = 3.3 V –1 VTRIP xISEN trip voltage For 100% current step AISENSE Current sense amplifier gain Reference only xVREF/5 V 5 V/V 7.
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DRV8834 www.ti.com SLVSB19D – FEBRUARY 2012 – REVISED MARCH 2015 7.7 Typical Characteristics 3.5 25.0 3.0 20.0 2.5 15.0 ±40C 25°C IVMQ (uA) IVM (mA) 85°C 2.0 10.0 1.5 5.0 ±40C 1.0 0.0 25°C 85°C 0.5 2.7 3.5 4.3 5.1 5.9 6.7 7.5 8.3 9.1 ±5.0 9.9 10.7 11.5 VVM (V) 2.7 3.6 4.5 5.4 6.3 7.2 8.1 9.0 9.9 10.8 VVM (V) C001 Figure 2. Operating Current C002 Figure 3. Sleep Current 700 600 RDS(ON) (HS + LS) (m) RDS(ON) (HS + LS) (m) ±40C 600 500 400 300 2.
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DRV8834 SLVSB19D – FEBRUARY 2012 – REVISED MARCH 2015 www.ti.com 8 Detailed Description 8.1 Overview The DRV8834 supports two configurations: phase/enable mode, where the outputs are controlled by phase (direction) and enable signals for each H-bridge, and indexer mode, which allow control of a stepper motor using simple step and direction inputs. DC motors can only be controlled in phase/enable mode; indexer mode is not applicable to DC motors.
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DRV8834 www.ti.com SLVSB19D – FEBRUARY 2012 – REVISED MARCH 2015 8.2 Functional Block Diagram VM VM + 0.01µF VM VM VM 10µF VCP VINT 2.2µF VREFO Internal Ref & Regs VINT, refs, Int. supp. Charge Pump VCP 0.01µF PUC, UVLO VM VREFO nENBL / AENBL AOUT1 STEP / BENBL Gate Drive & OCP DIR / BPHASE CONFIG DCM VM M0 / APHASE Step Motor AOUT2 M1 nSLEEP AISEN ISEN nFAULT VM Logic BOUT1 ADECAY Gate Drive & OCP BDECAY VREFO DCM VM OverTemp BOUT2 AVREF BVREF ISEN BISEN GND 8.
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DRV8834 SLVSB19D – FEBRUARY 2012 – REVISED MARCH 2015 www.ti.com Feature Description (continued) VM OCP VM VCP, VM xOUT1 Predrive Step Motor xOUT2 From Logic PWM OCP xISEN - *5 + xVREF Optional Comparator CONFIG DAC From Indexer 5 Figure 6. Motor Control Circuitry 8.3.1 Current Control The current through the motor windings may be regulated by a fixed-frequency PWM current regulation (current chopping). With stepping motors, current control is normally used at all times.
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DRV8834 www.ti.com SLVSB19D – FEBRUARY 2012 – REVISED MARCH 2015 Feature Description (continued) The blanking time also sets the minimum PWM duty cycle. This can cause current control errors near the zero current level when microstepping. To help eliminate this error, the DRV8834 has a dynamic tBLANK time. When the commanded current is low, the blanking period is reduced, which in turn lowers the minimum duty cycle.
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DRV8834 SLVSB19D – FEBRUARY 2012 – REVISED MARCH 2015 www.ti.com Feature Description (continued) The DRV8834 supports fast, slow, and also mixed decay modes. With DC motors, slow decay is nearly always used to minimize current ripple and optimize speed control; with stepper motors, the decay mode is chosen for a given stepper motor and operating conditions to minimize mechanical noise and vibration.
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DRV8834 www.ti.com SLVSB19D – FEBRUARY 2012 – REVISED MARCH 2015 8.3.3.1 Overcurrent Protection (OCP) An analog current limit circuit on each FET limits the current through the FET by limiting the gate drive. If this analog current limit persists for longer than the OCP deglitch time (tOCP), all FETs in the H-bridge are disabled and the nFAULT pin are driven low. The driver will be re-enabled after the OCP retry period (approximately 1.2 ms) has passed. nFAULT becomes high again at this time.
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DRV8834 SLVSB19D – FEBRUARY 2012 – REVISED MARCH 2015 www.ti.com Table 3. Stepping Format M1 M0 0 0 Full step (2-phase excitation) STEP MODE 0 1 1/2 step (1-2 phase excitation) 0 Z 1/4 step (W1-2 phase excitation) 1 0 8 microsteps/step 1 1 16 microsteps/step 1 Z 32 microsteps/step The M0 pin is a tri-level input. It can be driven logic low, logic high, or high-impedance (Z).
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DRV8834 www.ti.com SLVSB19D – FEBRUARY 2012 – REVISED MARCH 2015 Table 4.
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DRV8834 SLVSB19D – FEBRUARY 2012 – REVISED MARCH 2015 www.ti.com Table 4.
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DRV8834 www.ti.com SLVSB19D – FEBRUARY 2012 – REVISED MARCH 2015 Table 4.
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DRV8834 SLVSB19D – FEBRUARY 2012 – REVISED MARCH 2015 www.ti.com When exiting sleep mode, the nFAULT pin will be briefly driven active low as the internal power supplies turn on. nFAULT will return to inactive high once the internal power supplies (including charge pump) have stabilized. This process takes some time (up to 1 ms), before the motor driver becomes fully operational.
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DRV8834 www.ti.com SLVSB19D – FEBRUARY 2012 – REVISED MARCH 2015 Typical Application (continued) VM 10 uf VM VM 0.01 uf VCP Motor A Enable NENBL/AENBL Motor B Enable STEP/BENBL AOUT1 DIR/BPHASE AOUT2 M Motor B Direction Motor A Direction M0/APHASE M1 BOUT1 NSLEEP BOUT2 CONFIG NFAULT VREFO VINT M LOW = SLEEP AVREF BVREF AISEN 2.2 uf BISEN ADECAY BDECAY GND Figure 9. Phase/Enable Mode Driving Two DC Motors 9.2.1.1 Design Requirements Table 5 lists the design parameters. Table 5.
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DRV8834 SLVSB19D – FEBRUARY 2012 – REVISED MARCH 2015 www.ti.com TJ = TA + (PD × RθJA) = 35°C + (0.64 W x 47° C/W) = 65°C. (3) 9.2.1.2.3 Motor Current Trip Point When the voltage on pin SENSE exceeds VTRIP (0.5 V), overcurrent is detected. The RSENSE resistor should be sized to set the desired ITRIP level. RSENSE = 0.5 V / ITRIP (4) To set ITRIP to 2 A, RSENSE = 0.5 V / 2 A = 0.25 Ω. To prevent false trips, ITRIP must be higher than regular operating current.
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DRV8834 www.ti.com SLVSB19D – FEBRUARY 2012 – REVISED MARCH 2015 9.2.2 Phase/Enable Mode Driving a Stepper Motor VM 10 uf VM VM 0.01 uf Coil A Enable Coil B Enable Coil B Direction Coil A Direction VINT LOW = SLEEP VCP NENBL/AENBL STEP/BENBL AOUT1 DIR/BPHASE AOUT2 Stepper M0/APHASE M1 BOUT1 NSLEEP BOUT2 CONFIG NFAULT VREFO VINT AVREF BVREF AISEN 2.2 uf BISEN ADECAY BDECAY 51K GND 51K Figure 13. Phase/Enable Mode Driving a Stepper Motor 9.2.2.
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DRV8834 SLVSB19D – FEBRUARY 2012 – REVISED MARCH 2015 www.ti.com θstep can be found in the stepper motor data sheet or written on the motor itself. For the DRV8834, the microstepping level is set by the MODE pins and can be any of the settings in Table 6. Higher microstepping will mean a smoother motor motion and less audible noise, but will increase switching losses and require a higher fstep to achieve the same motor speed. 9.2.2.2.
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DRV8834 www.ti.com SLVSB19D – FEBRUARY 2012 – REVISED MARCH 2015 9.2.3 Indexer Mode Driving a Stepper Motor In indexer mode, only a rising edge on the STEP pin is needed to move the motor to the next step. The DIR pin sets which direction the motor rotates, by reversing the step sequence. The internal indexer can operate in fullstep, half-step, and smaller microsteps up to 1/32-step, depending on the state of the M0 and M1 pins.
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DRV8834 SLVSB19D – FEBRUARY 2012 – REVISED MARCH 2015 www.ti.com 9.2.3.2.1 Stepper Motor Speed The first step in configuring the DRV8834 requires the desired motor speed and microstepping level. If the target application requires a constant speed, then a square wave with frequency ƒstep must be applied to the STEP pin. If the target motor start-up speed is too high, the motor will not spin.
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DRV8834 www.ti.com SLVSB19D – FEBRUARY 2012 – REVISED MARCH 2015 9.2.4 High-Resolution Microstepping Using a Microcontroller to Modulate VREF Signals VM 10 uf VM VM 0.01 uf Coil A Enable Coil B Enable Coil B Direction Coil A Direction VINT LOW = SLEEP NENBL/AENBL STEP/BENBL AOUT1 DIR/BPHASE AOUT2 M1 BOUT1 NSLEEP BOUT2 CONFIG NFAULT VREFO VINT AVREF Coil B VREF BVREF AISEN 2.
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DRV8834 SLVSB19D – FEBRUARY 2012 – REVISED MARCH 2015 www.ti.com 9.2.4.3 Application Curves 1 Step 1 Step APHASE APHASE BPHASE BPHASE AVREF AENBL BVREF BENBL A Current A Current B Current B Current Figure 20. Microstepping Sequence Figure 21. Full Step Sequence (2-Phase) 1 Step APHASE BPHASE AENBL BENBL A Current B Current Figure 22.
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DRV8834 www.ti.com SLVSB19D – FEBRUARY 2012 – REVISED MARCH 2015 10 Power Supply Recommendations 10.1 Bulk Capacitance Having appropriate local bulk capacitance is an important factor in motor drive system design. It is generally beneficial to have more bulk capacitance, while the disadvantages are increased cost and physical size.
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DRV8834 SLVSB19D – FEBRUARY 2012 – REVISED MARCH 2015 www.ti.com 11 Layout 11.1 Layout Guidelines The VM pin should be bypassed to GND using low-ESR ceramic bypass capacitors with a recommended value of 0.01-μF rated for VM. This capacitor should be placed as close to the VM pin as possible with a thick trace or ground plane connection to the device GND pin. The VM pin must be bypassed to ground using an appropriate bulk capacitor.
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DRV8834 www.ti.com SLVSB19D – FEBRUARY 2012 – REVISED MARCH 2015 Thermal Considerations (continued) 11.3.2 Thermal Protection The DRV8834 has thermal shutdown (TSD) as described above. If the die temperature exceeds approximately 160°C, the device will be disabled until the temperature drops to a safe level. Any tendency of the device to enter thermal shutdown is an indication of either excessive power dissipation, insufficient heatsinking, or too high an ambient temperature. 11.3.
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DRV8834 SLVSB19D – FEBRUARY 2012 – REVISED MARCH 2015 www.ti.com 12 Device and Documentation Support 12.1 Documentation Support 12.1.1 Related Documentation • • • High Resolution Microstepping Driver With the DRV88xx Series, SLVA416 PowerPAD™ Thermally Enhanced Package, SLMA002 PowerPAD™ Made Easy, SLMA004 12.2 Trademarks PowerPAD is a trademark of Texas Instruments. All other trademarks are the property of their respective owners. 12.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 26-Mar-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.
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PACKAGE MATERIALS INFORMATION www.ti.com 26-Mar-2015 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) DRV8834PWPR HTSSOP PWP 24 2000 330.0 16.4 DRV8834RGER VQFN RGE 24 3000 330.0 DRV8834RGET VQFN RGE 24 250 180.0 6.95 8.3 1.6 8.0 16.0 Q1 12.4 4.25 4.25 1.15 8.0 12.0 Q2 12.4 4.25 4.25 1.15 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 26-Mar-2015 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) DRV8834PWPR HTSSOP PWP 24 2000 367.0 367.0 38.0 DRV8834RGER VQFN RGE 24 3000 367.0 367.0 35.0 DRV8834RGET VQFN RGE 24 250 210.0 185.0 35.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.