0.47 µF

to 1 µF

V

CC

6VREG

ROFF

HB

IN+

IN–

RMI

CPWM

VLIM SENSE

SGND

OUT2P

OUT2N

OUT1P

OUT1N

RD

FG

Discharge Circuit

Discharge

Pulse

6VREG

Hall Bias

Hysteresis

Amplifier

Thermal Shutdown

Oscillator

Controller

CT

Hall

VTH

TMP814

SLDS151A – MAY 2009 – REVISED JUNE 2015

www.ti.com

7 Detailed Description

7.1 Overview

The TMP814 device is a single phase bipolar predriver which uses the hall sensor & speed control inputs for

driving the single phase motor connected through H Bridge. The predriver outputs are designed for driving top

side P-type devices and bottom side N-channel FETs in the bridge. Multiple protections like overcurrent, soft-

start, speed control, lock detect, speed feedback and minimum speed are incorporated in the device. The circuit

limit of 18 V.

7.2 Functional Block Diagram

7.3 Feature Description

7.3.1 Speed Control

The speed control functionality is obtained by VTH pin of the device. For pulsed inputs user can supply a 20 kHz-

100 kHz frequency input (20 kHz to 50 kHz recommended on the pin with a current limiting resistor in between. If

not used, this pin needs to be connected to ground for full speed.

8

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