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TMP814 Datasheet(PDF) 6 Page - Texas Instruments |
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TMP814 Datasheet(HTML) 6 Page - Texas Instruments |
6 / 21 page 0 V CPWM V CC FG 0 V VTH voltage RMI voltage 4.55 V 1.65 V PWM-IN disconnected ON duty small f = 25 kHz (CP = 100 pF) ON duty large PWM control variable speed Full speed 12 V Rotation set to minimum speed (stop mode) Low speed High speed TMP814 SLDS151A – MAY 2009 – REVISED JUNE 2015 www.ti.com A. Minimum speed setting (stop) mode PWM-IN input is filtered to generate the VTH voltage. At low speed, the fan rotates with the minimum speed set with RMI during low speed. If the minimum speed is not set (RMI = 6VREG), the fan stops. B. Low ↔ high speed mode PWM control is made through comparison of oscillation and VTH voltages with CPWM changing between 1.6 V ↔ 4.6 V. Upper and lower TRs are turned ON when the VTH voltage is greater. The upper output TR is turned OFF when the VTH voltage is lower, and the coil current is regenerated in the lower TR. Therefore, as the VTH voltage lowers, the output ON duty increases, increasing the coil current and raising the motor speed. The rotation speed is fed back by the FG output. C. Full speed mode The full-speed mode becomes effective with the VTH voltage of 1.65 V or less. (VTH must be equal to GND when the speed control is not used.) D. PWM-IN input disconnection mode When the PWM-IN input pin is disconnected, VTH becomes 1.65 V or less and the output enables full drive at 100%. The fan runs at full speed (see Figure 3). Figure 1. Control Timing 6 Submit Documentation Feedback Copyright © 2009–2015, Texas Instruments Incorporated Product Folder Links: TMP814 |
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