SLDS153B May   2009  – November 2015 TMP815

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 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 Speed Control
      2. 7.3.2 Soft-Start
      3. 7.3.3 Lock Detection
      4. 7.3.4 Current Limit
      5. 7.3.5 Minimum Speed Setting
      6. 7.3.6 Speed Output
      7. 7.3.7 Drive Frequency Selection
    4. 7.4 Device Functional Modes
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Community Resource
    2. 11.2 Trademarks
    3. 11.3 Electrostatic Discharge Caution
    4. 11.4 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

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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 TMP815 device needs few external components for the features described in Feature Description . The device needs a 1-uF or greater capacitor connected at VCC. The device generates 5-V regulated output which can be used for pullups in the circuit as well as the Hall sensor.

8.2 Typical Application

Figure 5 shows the typical application diagram.

TMP815 ai_12v_app_cx_lds153.gif Figure 5. 12-V Sample Application Circuit

8.2.1 Design Requirements

For this design example, use the following parameters:

  • Input Voltage: 6 to 16 V
  • VCC capacitor: 1 µF or more
  • H Bridge top side: P-channel FETs
  • H Bridge bottom side: N-channel FETs

8.2.2 Detailed Design Procedure

Pins:

  • CPWM Capacitor: 220 pF for 30-kHz switching or appropriate.
  • VTH Pin connected to Ground for Full speed or supplied with pulsed input
  • RMI Pin Pulled high to 5VREG output or external connection if required
  • 5VREG connected to Hall Sensor. Hall sensor differential inputs connected to IN+ and IN-
  • Current sense resistor connected to SENSE pin or GND.
  • CT connected to Lock Detection capacitor (0.47 uF or calculated values) or to GND
  • Drive outputs connected to the Gates of the H bridge switches.
  • Pull up on FG.

Power Supply:

  • Make sure the power supply has set with sufficient current limit at the decided at the motor voltage.

Build the circuit with the recommended connections at the pins.

Test the motor circuit with hardware connected to it.

8.2.3 Application Curves

TMP815 start_up_at_12V_slds153.png Figure 6. Start-up at 12 V (Soft Start)
TMP815 motor_outputs_and_phase_current_at_duty_slds153.png Figure 8. Motor Outputs and Phase Current at Duty Cycle < 100%
TMP815 motor_outputs_and_phase_current_at_100_slds153.png Figure 7. Motor Outputs and Phase Current at 100% Duty Cycle
TMP815 motor_outputs_and_phase_currents_at_100_slds153.png Figure 9. Motor Outputs and Phase Currents at 100% Duty Cycle and With Hall Sensor Data