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Stepper Motor Driver Solutions

Stepper Motor Driver Solutions. Jon Chen. Applications Engineer. Introduction. Purpose To introduce ROHM’s line of stepper motor drivers Objectives To provide an overview of the product offering To discuss the focus of product development efforts

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Stepper Motor Driver Solutions

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  1. Stepper Motor Driver Solutions Jon Chen Applications Engineer

  2. Introduction Purpose • To introduce ROHM’s line of stepper motor drivers Objectives • To provide an overview of the product offering • To discuss the focus of product development efforts • To highlight the features/functionality of ROHM’s stepper motor drivers and their advantages • To introduce examples of common applications • To discuss available design resources

  3. Common Applications Printer / Copier (Paper Feed) Scanner Miscellaneous • Security Cameras • Sewing Machines Factory Automation Robotics

  4. Development Trend High Reliability Series (36V CLK-IN) BD6425EFV (1.5A) High Reliability Series (36V PARALLEL-IN) BD6423EFV (1.0A) BD63847EFV (2.0A) High Voltage Series (45V CLK-IN) BD63860EFV (2.5A) BD63843EFV (1.0A) Microstep Series (36V CLK-IN) BD63877EFV (2.0A) BD63876EFV (2.0A) Standard Series (36V PARALLEL-IN) BD63875EFV (1.5A) BD63874EFV (1.5A) Standard Series (36V CLK-IN) BD63873EFV (1.0A) BD63872EFV (1.0A) Low Voltage Series (PARALLEL-IN) BD6290EFV (0.8A) BD63801EFV (0.8A) BD6380EFV (0.8A) BD6381EFV (1.2A) 2013 Year

  5. Series Compatibility • Advantages • Identical pin-out configuration and package throughout entire series • Easy thermal design/standardization • Enables driver replacement in final step of design phase • Short development cycle and reduced risk related to motor change • Optimal driver available for virtually any motor spec • Low price High Voltage Series (CLK-IN) BD6425EFV (1.5A) BD6423EFV (1.0A) High Reliability Series (CLK-IN) ← Package & Pin Compatible BD63877EFV (2.0A) BD63875EFV (1.5A) BD63873EFV (1.0A) High Reliability Series (PARALLEL-IN) ← Package & Pin Compatible Microstep Series (CLK-IN) BD63876EFV (2.0A) BD63874EFV (1.5A) BD63872EFV (1.0A) Standard Series BD63860EFV (2.5A) BD63847EFV (2.0A) BD63843EFV (1.0A) Low Voltage Series (PARALLEL-IN) BD6290EFV (0.8A) BD63801EFV (0.8A) 63847 & 63843 are Package & Pin Compatible BD6381EFV (1.2A) BD6380EFV (0.8A)

  6. Package Benefits Conventional ROHM 4.0W 2.2W Unit: mm

  7. Performance and Reliability Technology Protection • Single power supply • Ghost Supply Prevention (GSP) • Mixed Decay Mode • Linearly variable fast/slow decay ratio • Pin-compatible lineup • Bipolar PWM constant current drive • Thin, compact power package • Power DMOS • Over-Current Protection (OCP) • Thermal Shutdown (TSD) • Under-/Over-Voltage Lockout (UVLO/OVLO) Safety • IC reverse polarity protection • High ESD resistance: 4000V (HBM)/400V (MM) • IC pin short protection • No charge pump

  8. Single Power Supply Drive • Advantages • No separate power supply required for logic (reduces external component count - no bypass capacitor needed) • Simplifies power up/down sequence • Simplifies PCB layout and routing Dual Power Supply Single Power Supply VM VM Vcc Logic Driver Internal Regulator Driver Logic Note: Does not apply to low voltage solutions

  9. Ghost Supply Prevention (GSP) • Advantages • Prevents malfunctions in motor driver IC and other ICs on the same supply line (Vcc) • Simplifies power up/down sequence Malfunctions No Malfunctions Vcc = Vinput-１Vf Vcc Vcc No Pass Route input input Micro-controller Micro-controller GND GND

  10. Linearly Variable Fast/Slow Decay Ratio Output current is distorted during current ramp-down Slow Decay Mix Decay - Better Mix Decay - Better Vibration / Noise VDS adjusts to motor and control signals = Improved characteristics Output Current (in Quarter Steps)

  11. Over-Current Protection (OCP) • Advantages • Provides better, more reliable protection than a fuse • Latch-type OCP provides instantaneous protection Image of chip damaged due to overcurrent Without OCP With OCP Short-Circuit Short-Circuit Instantaneous Protection Output Current (5A/DIV) Failure Output Current (5A/DIV) (200 μsec/DIV) (200 μsec/DIV) 4 µs

  12. No Charge Pump • Advantages • Fewer external components (eliminates 2+ high-voltage electrolytic capacitors) • High resistance to failure • Reduced EMI Charge Pump Circuit CP1 Vcc Vcc CP2 VG Pre- Driver Pre- Driver Pch Nch OUT OUT Nch Nch RNF RNF

  13. BD63843/47EFV (Microstep / 36V) • Features • Supply voltage: 36V Vcc (internal voltage regulator) • DMOS output (Pch + Nch) (1.0A Io max.: BD63843EFV / 2.0A max.: BD63847EFV) • Constant current PWM driver • Serial/CLK IN with built-in translator • No charge pump required • Full-/Half-/Eighth-/Sixteenth-step • Mixed/Auto decay modes • Linearly variable fast/slow decay ratio • Integrated 4-bit DAC • Multiple protection functions: TSD/UVLO/OVLO/OCP • HTSSOP-B28 package Block Diagram 4.7 w

  14. 4.7uF 0.1uF VCC 24 VREF VREF 23 BD638xEFV Series (Low Voltage Type) Current Limit Comp. VLIM1 3 VM1 9 OUT1A 10 Logic Predriver 11 OUT1B 12 CR1 0.3Ω RNF1 CR Timer 5 4 39kΩ 1000pF SENSE1 UVLO PS 2 47uF 0.1uF IN1A 6 TSD IN1B 7 OCP IN2A 19 IN2B 18 VM2 CR2 16 CR Timer OUT2A 20 Predriver 15 39kΩ 1000pF 14 OUT2B 13 0.3Ω RNF2 VLIM2 22 21 Current Limit Comp. SENSE2 1 GND • Features • Wide supply voltage range • Vcc: 2.5 - 5.5V • VM1,2: 4 - 13.5V (BD6380EFV), 6 - 13.5V (BD6381EFV) • DMOS output • Io (max): 0.8A (BD6380EFV) • Io (max): 1.2A (BD6381EFV) • Constant current PWM driver (Fixed Off Time Type) • Reference voltage: 1V ± 3% • Multiple protection functions: • TSD/UVLO/OCP • Crossover current protection • IC pin short protection • Standby current: ~ 0µA • HTSSOP-B24 package Block Diagram

  15. BD642xEFV Series (High Voltage Type) BD6425EFV Block Diagram & Application Circuit • Features • Supply voltage: 42V Vcc (Internal voltage regulator) • Output current • Io (max): 1.5 A (BD6425EFV) • Io (max): 1.0 A (BD6423EFV) • Constant current PWM driver • Multiple protection functions • TSD/UVLO/OCP • IC pin short protection • 8kV ESD resistance • HTSSOP-B28 package (BD6425EFV) • HTSSOP-B24 package (BD6423EFV)

  16. Comprehensive Support System Support is available at all stages of product test/evaluation and during the design process. Feel free to consult with us on any matter. IC Selection ROHM’s short form catalog and component-specific selection guides facilitate quick and easy selection of potential solutions for customer applications. Testing & Evaluation Detailed technical notes allow design engineers to assess the capabilities and benefits of ROHM’s solutions. Evaluation hardware is available upon request. Integration of ROHM’s Solutions in Customer Applications ROHM’s tech notes address numerous design topics. E-mail support is available to assist with issues such as board layout/routing and external component selection. Operational Analysis ROHM engineers can provide performance improvement recommendations by analyzing customer designs. Troubleshooting ROHM provides services such as evaluation of customer board layout/routing and testing via EMI scan. Failure Resolution ROHM’s Quality Assurance Centers will issue a preliminary report within 24 hours of receipt of suspect components. Analysis and failure reproduction will then be conducted and relevant precautions/countermeasures recommended.

  17. Chemical Compliance ROHM complies with all major substance directives and regulations • Restriction of Hazardous Substances (RoHS) • Deca BDE / PFOS • Registration Evaluation Authorization of Chemicals (REACH) • Halogen-free (HF) Sample RoHS-Compliant Product List REACH Statement

  18. Online Support: www.ROHM.com A number of support tools are available for many P/Ns: • Detailed materials composition • Technical notes (for ICs) • Supplementary information (FAQs) • Design simulation tool

  19. Summary • A focus on integration along with package and pin compatibility has resulted in a product offering which has eased the burden on designers • Through the use of packaging with a bottom side heat sink and the availability of features such as serial CLK IN clock signal control, ROHM has been able to reduction the size and complexity of its drivers • Elimination of the ghost supply path has improved operational reliability while the addition of overcurrent protection combined with robust resistance to ESD has made ROHM stepper motor drivers less prone to failure • Expansion of the product offering to include microstep and high voltage solutions has allowed ROHM to branch out into applications that were previously out of reach

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