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  • DRV11873 12-V, 3-Phase, Sensorless BLDC Motor Driver

    • SLWS237A November   2012  – November 2014 DRV11873

      PRODUCTION DATA.  

  • CONTENTS
  • SEARCH
  • DRV11873 12-V, 3-Phase, Sensorless BLDC Motor Driver
  1. 1 Features
  2. 2 Applications
  3. 3  Description
  4. 4 Simplified Schematic
  5. 5 Revision History
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 Handling Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1  Speed Control
      2. 8.3.2  Frequency Generator
      3. 8.3.3  FS Setting
      4. 8.3.4  Lock Protection and RD Output
      5. 8.3.5  Reverse Spin Control FR
      6. 8.3.6  5-V LDO
      7. 8.3.7  Overcurrent Protection
      8. 8.3.8  UVLO
      9. 8.3.9  Thermal Shutdown
      10. 8.3.10 Anti-Voltage Surge (AVS)
    4. 8.4 Device Functional Modes
      1. 8.4.1 Startup
      2. 8.4.2 Closed Loop Control
      3. 8.4.3 AVS Protection
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Trademarks
    2. 12.2 Electrostatic Discharge Caution
    3. 12.3 Glossary
  13. 13Mechanical, Packaging, and Orderable Information
  14. IMPORTANT NOTICE

Package Options

Mechanical Data (Package|Pins)
  • PWP|16
    • MPDS371A
Thermal pad, mechanical data (Package|Pins)
  • PWP|16
    • PPTD288A
Orderable Information
  • slws237a_oa
  • slws237a_pm
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    • Full reading width
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DATA SHEET

DRV11873 12-V, 3-Phase, Sensorless BLDC Motor Driver

1 Features

  • Input Voltage Range: 5 to 16 V
  • Six Integrated MOSFETs With 1.5-A Continuous Output Current
  • Total Driver H + L RDSON 450 mΩ
  • Sensorless Proprietary BMEF Control Scheme
  • 150° Commutation
  • Synchronous Rectification PWM Operation
  • FG and RD Open-Drain Output
  • 5-V LDO for External Use up to 20 mA
  • PWMIN Input from 7 to 100 kHz
  • Overcurrent Protection With Adjustable Limit Through External Resistor
  • Lock Detection
  • Voltage Surge Protection
  • UVLO
  • Thermal Shutdown

2 Applications

  • Appliance Cooling Fan
  • Desktop Cooling Fan
  • Server Cooling Fan

3 Description

DRV11873 is a three-phase, sensorless motor driver with integrated power MOSFETs with drive current capability up to 1.5-A continuous and 2-A peak. DRV11873 is specifically designed for fan motor drive applications with low noise and low external component count. DRV11873 has built-in overcurrent protection with no external current sense resistor needed. The synchronous rectification mode of operation achieves increased efficiency for motor driver applications. DRV11873 outputs FG and RD to indicate motor status with open-drain output. A 150° sensorless BEMF control scheme is implemented for a three-phase motor. DRV11873 is available in the thermally-efficient 16-pin TSSOP package. The operation temperature is specified from –40°C to 125°C.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
DRV11873 HTSSOP (16) 4.40 mm × 5.00 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

4 Simplified Schematic

sch_FAD_lws237.gif

5 Revision History

Changes from * Revision (November 2012) to A Revision

  • Added Handling 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 Go
  • Changed ƒPWM minimum valueGo

6 Pin Configuration and Functions

PWP Package
16 Pins
(Top View)
po_pwp_lws237.gif

Pin Functions

PIN I/O(1) DESCRIPTION
NAME NO.
FS 1 I Motor parameter adjustment pin. Pull low for lower-speed motor and pull high for high-speed motor.
FG 2 O Frequency generator output. The output period is equal to 6 electrical states (FG).
RD 3 O In the lock condition, RD output is high through a pullup resistor to VCC or 5 V.
VCP 4 O Charge pump output
CPP 5 O Charge pump conversion terminal
CPN 6 O Charge pump conversion terminal
W 7 O Phase W output
GND 8 — Ground pin
V 9 O Phase V output
U 10 O Phase U output
VCC 11 I Input voltage for motor and chip supply voltage
V5 12 O 5-V regulator output
COM 13 I Motor common terminal input. If the motor does not have a common wire, see Application and Implementation for more details.
CS 14 I Overcurrent threshold set-up pin. A resistor set-up current limit is connected between this pin and ground. The voltage across the resistor compares with the voltage converted from the bottom MOSFETs' current. If MOSFETs' current is high, the part goes into the overcurrent protection mode by turning off the top PWM MOSFET and keeping the bottom MOSFET on.
Ilimit(A) = 6600 / RCS (Ω); Equation valid range: 500 mA < Ilimit < 2000 mA
FR 15 I Set high for reverse rotation. Set low or floating for forward rotation.
PWMIN 16 I PWM input pin. The PWM input signal is converted to a fixed switching frequency on the MOSFET driver.
(1) I = input, O = output, N/A = not available

7 Specifications

7.1 Absolute Maximum Ratings

over operating free-air temperature (unless otherwise noted)
MIN MAX UNIT
Input voltage(1) VCC –0.3 20 V
CS –0.3 3.6
PWMIN, FS, FR –0.3 6
GND –0.3 0.3
COM –1 20
Output voltage(1) U, V, W –1 20 V
FG, RD –0.3 20
VCP –0.3 25
CPN –0.3 20
CPP –0.3 25
V5 –0.3 6
TJ Operating junction temperature –40 125 °C
(1) Voltage values are with respect to the network ground terminal unless otherwise noted.

7.2 Handling Ratings

MIN MAX UNIT
Tstg Storage temperature range –55 150 °C
V(ESD) Electrostatic discharge Human body model (HBM), per ANSI/ESDA/JEDEC JS-001, all pins(1) –4000 4000 V
Charged device model (CDM), per JEDEC specification JESD22-C101, all pins(2) –1000 1000
Machine model (MM) –200 200
(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
(2) JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.

7.3 Recommended Operating Conditions

over operating free-air temperature range (unless otherwise noted)
MIN MAX UNIT
Supply voltage VCC 5 16 V
Voltage range U, V, W –0.7 17 V
COM –0.1 17
FG, RD –0.1 16
PGND, GND –0.1 0.1
VCP –0.1 22
CPP –0.1 22
CPN –0.1 16
V5 –0.1 5.5
PWMIN, FR, FS –0.1 5.5
TJ Operating junction temperature –40 125 V

7.4 Thermal Information

THERMAL METRIC(1) DRV11873 UNIT
PWP
16 PINS
RθJA Junction-to-ambient thermal resistance 39.4 °C/W
RθJC(top) Junction-to-case (top) thermal resistance 30.3
RθJB Junction-to-board thermal resistance 25.6
ψJT Junction-to-top characterization parameter 0.5
ψJB Junction-to-board characterization parameter 10.2
RθJC(bot) Junction-to-case (bottom) thermal resistance 3.6
(1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.

7.5 Electrical Characteristics

over recommended operating free-air temperature (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
SUPPLY CURRENT
IVCC Supply current TA = 25°C; PWM = VCC; VCC = 12 V 2.7 5 mA
UVLO
VVUVLO-th_r UVLO threshold voltage Rise threshold, TA = 25°C 4.3 4.6 V
VUVLO-th_f UVLO threshold voltage Fall threshold, TA = 25°C 3.9 4.1 V
VUVLO-thhys UVLO threshold voltage hysteresis TA = 25°C 100 200 300 mV
INTEGRATED MOSFET
RDSON Series resistance (H + L) TA = 25°C; VCC = 12 V; VCP = 19 V;
IOUT = 1.5 A		 0.45 0.6 Ω
PWM
VPWM-IH High-level input voltage VCC ≥ 4.5 V 2.7 V
VPWM-IL Low-level input voltage VCC ≥ 4.5 V 0.8 V
ƒPWM PWM input frequency 7 100 kHz
IPWM-SOURCE PWM source current 35 50 65 µA
FG
IFG-SINK FG pin sink current VFG = 0.3 V 5 mA
IFG-short FG pin short current limit VFG = 12 V 20 25 mA
RD
IRD-SINK RD pin sink current VRD = 0.3 V 5 mA
IRD-short RD pin short current limit VRD = 12 V 20 25 mA
FR and FS
VFR-IH High-level input voltage VCC ≥ 4.5 V 2.3 V
VFR-IL Low-level input voltage VCC ≥ 4.5 V 0.8 V
VFS-th FS set threshold voltage VCC ≥ 4.5 V 2.3 0.8 V
V5
V5 5-V LDO voltage VCC = 12 V 4.75 5 5.25 V
IV5 5-V LDO load current VCC = 12 V 20 mA
LOCK PROTECTION
tLOCK-ON Lock detect time FS = 0 0.875 1.25 1.625 s
FS = 1 0.437 0.625 0.812
tLOCK-OFF Lock release time FS = 0 4.375 6.25 8.125 s
FS = 1 2.187 3.125 4.06
CURRENT LIMIT
Current limit CS pin to GND resistor = 3.3 kΩ 1.7 2 2.3 A
THERMAL SHUTDOWN
TSDN Shutdown temperature threshold Shutdown temperature 160 °C
Hysteresis 10

7.6 Typical Characteristics

start_up_100_lws237.gif
Input voltage = 12 V PWM duty = 100% FS = 1
t = 20 ms/div
Figure 1. Start Up at 100% Duty
nrml_op_100_lws237.gif
Input voltage = 12 V PWM duty = 100% FS = 1
t = 800 µs/div
Figure 3. Normal Operation at 100% Duty
lock_protection_lws237.gif
Input voltage = 12 V PWM duty = 100% FS = 1
t = 1 s/div
Figure 5. Lock Protection
fast_motor_lws237.gif
Figure 7. Fast Motor RPM vs Duty, FS = 1
fast_motor_vs_voltage_lws237.gif
Figure 9. Fast Motor RPM vs Voltage, FS = 1
ldo_line_reg_lws237.gif
Figure 11. 5-V LDO Line Regulation
start_up_10_lws237.gif
Input voltage = 12 V PWM duty = 10% FS = 1
t = 40 ms/div
Figure 2. Start Up at 10% Duty
nrml_op_50_lws237.gif
Input voltage = 12 V PWM duty = 50% FS = 1
t = 800 µs/div
Figure 4. Normal Operation at 50% Duty
avs_op_lws237.gif
Input voltage = 12 V PWM duty switch from 100% to 20%
t = 20 ms/div FS = 1
Figure 6. AVS Operation
slow_motor_lws237.gif
Figure 8. Slow Motor RPM vs Duty, FS = 0
slow_motor_vs_voltage_lws237.gif
Figure 10. Slow Motor RPM vs Voltage, FS = 0
ldo_load_reg_lws237.gif
Figure 12. 5-V LDO Load Regulation

 
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