SLVSBA5D October   2012  – April 2016 DRV8313

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Switching Characteristics
    7. 6.7 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Output Stage
      2. 7.3.2 Bridge Control
      3. 7.3.3 Charge Pump
      4. 7.3.4 Comparator
      5. 7.3.5 Protection Circuits
        1. 7.3.5.1 Undervoltage Lockout (UVLO)
        2. 7.3.5.2 Thermal Shutdown (TSD)
        3. 7.3.5.3 Overcurrent Protection (OCP)
    4. 7.4 Device Functional Modes
      1. 7.4.1 nRESET and nSLEEP Operation
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 Three-Phase Brushless-DC Motor Control
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 Motor Voltage
          2. 8.2.1.2.2 Motor Commutation
        3. 8.2.1.3 Application Curve
      2. 8.2.2 Three-Phase Brushless-DC Motor Control With Current Monitor
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
          1. 8.2.2.2.1 Trip Current
          2. 8.2.2.2.2 Sense Resistor
      3. 8.2.3 Brushed-DC and Solenoid Load
        1. 8.2.3.1 Design Requirements
          1. 8.2.3.1.1 Detailed Design Procedure
      4. 8.2.4 Three Solenoid Loads
        1. 8.2.4.1 Design Requirements
          1. 8.2.4.1.1 Detailed Design Procedure
  9. 9 Power Supply Recommendations
    1. 9.1 Bulk Capacitance
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
    3. 10.3 Thermal Considerations
      1. 10.3.1 Heatsinking
    4. 10.4 Power Dissipation
  11. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 Community Resources
    3. 11.3 Trademarks
    4. 11.4 Electrostatic Discharge Caution
    5. 11.5 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

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 DRV8313 can be used to drive Brushless-DC motors, Brushed-DC motors, and solenoid loads. The following design procedure can be used to configure the DRV8313.

8.2 Typical Applications

8.2.1 Three-Phase Brushless-DC Motor Control

In this application, the DRV8313 is used to drive a Brushless-DC motor

DRV8313 typ_app_lvsba5.gif Figure 13. BLDC Driver Application Schematic

8.2.1.1 Design Requirements

Table 4 gives design input parameters for system design.

Table 4. Design Parameters

DESIGN PARAMETER REFERENCE EXAMPLE VALUE
Typical supply voltage VM 18 V
Maximum voltage VMMAX 36 V
Target rms current IRMS 1.2 A
Motor winding resistance MR 0.5 Ω
Motor winding inductance ML 0.28 mH
Motor poles MP 16 poles
Motor rated RPM MRPM 4000 RPM
PWM frequency fPWM 25 kHz

8.2.1.2 Detailed Design Procedure

8.2.1.2.1 Motor Voltage

Brushless-DC motors are typically rated for a certain voltage (for example 12 V and 24 V). Operating a motor at a higher voltage corresponds to a lower drive current to obtain the same motor power. A higher operating voltage also corresponds to a higher obtainable rpm. DRV8313 allows for the use of higher operaing voltage because of a maximum VM rating of 60 V.

Operating at lower voltages generally allows for more accurate control of phase currents. The DRV8313 functions down to a supply of 8 V.

8.2.1.2.2 Motor Commutation

The DRV8313 can drive both trapezoidal (120°) and sinusiodal (180°) commutation due to independent control of each of the three 1/2-H bridges.

Both synchronous and asynchronous rectification are supported. Synchronous rectification is achieved by applying a pulse-width-modulated (PWM) input signal to the INx pins while driving. The user can also implement asynchronous rectification by applying the PWM signal to the ENx inputs.

Table 5. Trapezoidal (120°) Commutation States

State OUT1 (Phase U) OUT2 (Phase V) OUT3 (Phase W)
IN1 EN1 OUT1 IN2 EN2 OUT2 IN3 EN3 OUT3
1 X 0 Z 1 1 H 0 1 L
2 1 1 H X 0 Z 0 1 L
3 1 1 H 0 1 L X 0 Z
4 X 0 Z 0 1 L 1 1 H
5 0 1 L X 0 Z 1 1 H
6 0 1 L 1 1 H X 0 Z
Brake 0 1 L 0 1 L 0 1 L
Coast X 0 Z X 0 Z X 0 Z

8.2.1.3 Application Curve

DRV8313 BLDC operation.png
Figure 14. Driving a BLDC Motor

8.2.2 Three-Phase Brushless-DC Motor Control With Current Monitor

In this application, the DRV8313 is used to drive a brushless-DC motor and the uncommitted comparator is used to monitor the motor current

DRV8313 alt1_app_lvsba5.gif Figure 15. Uncommitted Comparator Used As a Current Monitor

8.2.2.1 Design Requirements

Table 6 gives design input parameters for system design.

Table 6. Design Parameters

DESIGN PARAMETER REFERENCE EXAMPLE VALUE
Trip current ITRIP 2.5 A

8.2.2.2 Detailed Design Procedure

8.2.2.2.1 Trip Current

The uncommitted comparator is configured such that the negative input COMPN is connected to the PGNDx pins. A sense resistor is placed from the PGNDx/COMPN pins to GND.

The voltage on the COMPP pin will set the current monitor trip threshold. In this case, the the nCOMPO pin will change state when COMPP and COMPN have the same potential.

Equation 1. DRV8313 eq_I_trip_lvsba5.gif
Example: If the desired trip current is 2.5 A
Set RSENSE = 200 mΩ
COMPN would have to be 0.5 V.
Create a resistor divider from V3P3 (3.3 V) to set COMPN ≈ 0.5 V.
Set R2 = 10 kΩ, set R1 = 56 kΩ

8.2.2.2.2 Sense Resistor

For optimal performance, the sense resistor must have the following characteristics:

  • Surface-mount
  • Low inductance
  • Rated for high enough power
  • Placed closely to the motor driver

The power dissipated by the sense resistor equals Irms 2 × R. For example, if the rms motor current is 1 A and a 200-mΩ sense resistor is used, the resistor will dissipate 1 A2 × 0.2 Ω = 0.2 W. The power quickly increases with higher current levels.

Resistors typically have a rated power within some ambient temperature range, along with a derated power curve for high ambient temperatures. When a PCB is shared with other components generating heat, margin should be added. Measuring the actual sense-resistor temperature in a final system, along with the power MOSFETs, is always best because these are often the hottest components.

Because power resistors are larger and more expensive than standard resistors, using multiple standard resistors in parallel, between the sense node and ground is a common practice. This configuration distributes the current and heat dissipation.

8.2.3 Brushed-DC and Solenoid Load

DRV8313 alt2_app_lvsba5.gif Figure 16. Brushed-DC and Solenoid Schematic

8.2.3.1 Design Requirements

Table 7 gives design input parameters for system design.

Table 7. Design Parameters

DESIGN PARAMETER REFERENCE EXAMPLE VALUE
Brushed motor rms current IRMS, BDC 1.0 A
Brushed motor peak current IPEAK, BDC 2.0 A
Solenoid rms current IRMS, SOL 0.5 A
Solenoid peak current IPEAK, SOL 1.0 A

8.2.3.1.1 Detailed Design Procedure

Table 8. Brushed-DC Control

Function IN1 EN1 IN2 EN2 OUT1 OUT2
Forward 1 1 0 1 H L
Reverse 0 1 1 1 L H
Brake (low-side slow decay) 0 1 0 1 L L
High-side slow decay 1 1 1 1 H H
Coast X 0 X 0 Z Z

Table 9. Solenoid Control (High-Side Load)

Function IN3 EN3 OUT3
Coast / Off X 0 Z
On 0 1 L
Brake 1 1 H

8.2.4 Three Solenoid Loads

DRV8313 alt3_app_lvsba5.gif Figure 17. Three Independent Load Connections Schematic

8.2.4.1 Design Requirements

Table 10 gives design input parameters for system design.

Table 10. Design Parameters

DESIGN PARAMETER REFERENCE EXAMPLE VALUE
Solenoid rms current IRMS, SOL 1.0 A
Solenoid peak current IPEAK, SOL 1.5 A

8.2.4.1.1 Detailed Design Procedure

Table 11. Solenoid Control (high-side load)

Function IN2 EN2 OUT2
Coast / Off X 0 Z
On 0 1 L
Brake 1 1 H

Table 12. Solenoid Control (low-side load)

Function IN1 EN1 OUT1
Coast / Off X 0 Z
On 1 1 H
Brake 0 1 L