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THMC45DGN Datasheet(PDF) 1 Page - Texas Instruments |
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THMC45DGN Datasheet(HTML) 1 Page - Texas Instruments |
1 / 15 page THMC45 5V AND 3.3V DC BRUSHLESS FAN MOTOR DRIVER WITH SINGLE WIRE CONTROL SLIS101A − MAY 2001 1 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 D 5-V DC Fan Motor PWM Drive for Speed Control With No External Power Drive Stage Required D High Efficiency H-Bridge Topology With Integrated Low RDSON MOS Output Drivers to Drive Single Winding, Bipolar Wound, Two-Phase BLMs D Digital PWM Input to Control Output PWM Frequency and Duty Cycle—Suited for Cooling Fan Applications Requiring Variable RPM Control to Reduce Noise/Increase MTBF D Single Wire RPM Control, Tachometer Feedback Signal, and Locked Rotor Detect Feedback Signal D Low Current Sleep State D Tachometer Signal Valid Over Entire RPM Range D Noise Immune Signal Conditioning to Allow Use of Low Cost Hall Effect Position Sensor D Locked Rotor Protection With Auto Retry D Thermal Shutdown Protection D 8-Pin MSOP PowerPad Package Suited for Small Fan Circuit Board and Rotor Housing description The THMC45 is a dc brushless motor (BLM) driver and control device designed for use with low-voltage (5 V or 3.3 V) dc cooling fans having two-phase motors with a single-winding stator. The device includes a high-efficiency H-bridge pulse width modulation (PWM) drive topology with integrated MOS high-side and low-side drivers, plus a PWM control input stage to provide the industry’s first efficient speed control solution inside low-voltage dc cooling fans. This solution eliminates the need for any power drive components on the main system board, reducing printed-circuit board (PCB) component count, PCB space, and assembly time. The device also offers two advantages over the other commonly used fan speed control methods, adjustable external dc supply voltage and adjustable external PWM drive duty cycle. Unlike the external linear voltage regulation method, the THMC45 high-efficiency PWM drive method adjusts the level of motor winding power while all other circuitry inside the fan obtains a fixed dc voltage from the fan supply. This eliminates problems with loss of headroom to internal control circuitry at low fan supply voltage and the resulting limitation of low-speed operation of 40% that is typically associated with external dc voltage regulation. The high-efficiency PWM drive method employed by the THMC45 reduces fan supply power consumption and maximizes full-scale RPM speed over the external linear voltage regulation method, which has V × I power loss due to the voltage drop across the regulator. The THMC45 includes a Hall sensor amplifier and signal conditioning, global thermal shutdown, and locked rotor protection with automatic restart after a locked rotor condition. The device provides a sleep state to eliminate the need for an external power component to disconnect the fan from the supply during a system sleep state. The device also has internal reverse blocking capability to prevent excessive reverse leakage current due to reversal of power line. The THMC45 is primarily designed for 5-V dc notebook PC cooling fan applications that require single-wire RPM speed control and tachometer feedback. However, with an open-drain tachometer output, the device is also suitable for applications that require two wires for RPM speed control and tachometer signal. Copyright 2001, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. PowerPAD is a trademark of Texas Instruments. PWM 8 7 6 5 1 2 3 4 VPWR DGN Package (TOP VIEW) H− OUTA H+ OUTB TACH GND |
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