TMP814

Vm

Speed Setting

Vover

Lock Detection

Speed Output

Frequency Set

Current Limit

H+

H-

RF

Limit Vcc

(Optional)

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TMP814

SLDS151A – MAY 2009 – REVISED JUNE 2015

TMP814 Variable Speed Single-phase Full-wave Fan Motor Predriver

1

1 Features

•

Predriver for Single-Phase Full-Wave Drive

•

Lock Protection and Automatic Reset Functions

Incorporated

–

PNP-NMOS is Used as an External Power TR,

•

FG (Rotation Speed Detection) and RD (Lock

Enabling High-Efficiency Low-Consumption

Detection) Output

Drive by Means of the Low-Saturation Output

and Single-Phase Full-Wave Drive (PMOS-

2 Applications

NMOS Also Applicable)

•

External PWM Input Enabling Variable Speed

•

Server Fans (Up to 48 V)

Control

•

Appliance Fans (Up to 48 V)

–

Separately-Excited Upper Direct PWM (f = 25

kHz) Control Method, Enabling Highly Silent

3 Description

Speed Control

The TMP814 is a single-phase bipolar variable speed

fan motor predriver that works with an external PWM

•

Compatible with 12-V, 24-V, and 48-V Power

signal.

A

highly

efficient,

quiet

and

low-power

Supplies

consumption motor driver circuit, with a large variable

•

Current Limiter Circuit Incorporated

speed, can be implemented by adding a small

–

Chopper Type Current Limit at Start

number of external components.

•

Reactive Current Cut Circuit Incorporated

This device is optimal for driving large scale fan

–

Reactive Current Before Phase Change is Cut

motors (with large air volume and large current) such

to Enable Silent and Low-Consumption Drive

as those used in servers and consumer products.

•

Minimum Speed Setting Pin

Device Information(1)

–

Minimum Speed Can Be Set With External

PART NUMBER

PACKAGE

BODY SIZE (NOM)

Resistor. Start Assistance Circuit Enables Start

TMP814

TSSOP (PW)

4.40 mm x 6.50 mm

at Extremely Low Speed.

(1) For all available packages, see the orderable addendum at

•

Constant-Voltage Output Pin for Hall Bias

the end of the data sheet.

Simplified Schematic

1

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.