Texas Instruments THMC40
The THMC40 and THMC41 are 2-phase, dc brushless motor (BLM) drive and control devices intended for use with 12-Vdc cooling fans. Both devices include a high-efficiency PWM drive topology using integrated 0.5-Ω (typical) LDMOS drivers, plus a speed control input stage to provide the industry’s first solution for efficient speed control inside dc cooling fans. This patented solution eliminates the need for power drive components on the main system board, thus reducing printed-circuit board (PCB) component count, PCB space, and assembly time.| Part No. | THMC40 |
|---|---|
| Datasheet | THMC40 Download |
| Manufacturer |  Texas Instruments |
| Description | Variable Speed 12-VDC Brushless Fan Motor Drivers |
| Buy | Stock & Price |
APPLICATIONS
Requiring Variable RPM to Reduce Noise and/or Increase MTBF D Speed Control Capability With Either DC or PWM Input Signal for Greater System-Level Flexibility D Sleep-State Mode to Eliminate External Fan ON/OFF Power Device – Suited for Cooling Fans in Instantly Available PCs D Thermal Shutdown Protection THMC40 . . . TACH OUTPUT 14-Pin SOP D Package (TOP VIEW) COSC 1 TACH 2 CP 3 VPWR 4 VOUT 5 NC 6 PGND 7 14 VPWM 13 H+ 12 H– 11 PHA 10 PHB 9 AGND 8 NC SLIS097 – MARCH 2000 D High Impedance VPWM Input for Speed Control of Multiple Fans With a Single Signal D Locked Rotor Protection (THMC40, THMC41) With Open-Drain Output Indication (THMC41) D Open-Drain Tachometer Signal Valid Over Entire RPM Range (THMC40) D Noise Immune Signal Conditioning to Allow Use of Low-Cost Hall Effect Position Sensor D Patented High Efficiency Drive Topology With Integrated Low RDS(ON) LDMOS Output Drivers THMC41 . . . RD OUTPUT 14-Pin SOP D Package (TOP VIEW) COSC 1 RD 2 CP 3 VPWR 4 VOUT 5 NC 6 PGN...
