TMP814_15 Datasheet, PDF (13/21 Pages) Texas Instruments – Variable Speed Single-phase Full-wave Fan Motor Predriver

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TMP814
SLDS151A – MAY 2009 – REVISED JUNE 2015
Typical Applications (continued)
• VTH Pin connected to Ground for Full speed or supplied with pulsed input.
• RMI Pin Pulled high to 6VREG output or external connection if required.
• ROFF pulled to 6VREG.
• 6VREG connected to Hall Sensor. Hall sensor differential inputs connected to IN+ and IN-.
• SENSE pin or GND.
• CT connected to Lock Detection capacitor (0.47uF or calculated values)or to GND.
• Drive outputs connected to the Gates of the H bridge switches.
• Pullup on FG.
• VLIM and VOVER kept open.
Power Supply:
• Make sure the power supply has set with sufficient current limit at the decided at the motor voltage.
Build the circuit with previously recommended connections at the pins.
Test the motor circuit with hardware connected to it.
8.2.1.3 Application Curves
Figure 4. Start-up at 12 V
Figure 5. Motor Outputs and Phase Current at 100% Duty
Cycle
Figure 6. Lock Detection Waveform
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