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1 Features

? Predriver for Single-Phase Full-Wave Drive

– PNP-NMOS is used as an external power TR,

enabling high-efficiency low-consumption drive

by means of the low-saturation output and

single-phase full-wave drive. (PMOS-NMOS

also applicable)

? External PWM Input Enables Variable-Speed

Control

– Separately-excited upper direct PWM

(f = 25 kHz) control method, enabling highly

silent speed control

? Current Limiter Circuit

– Chopper-type current limit at start

? Reactive Current-Cut Circuit

– Reactive current before phase change is cut to

enable silent and low-consumption drive

? Minimum Speed Setting Pin

– Minimum speed can be set with external

resistor. The start assistance circuit enables

start at extremely low speed.

? Constant-Voltage Output Pin for Hall Bias

? Lock Protection and Automatic Reset Functions

? Rotation Speed Detection (FG) and Lock

Detection (RD) Outputs

2 Applications

? Server Fans

? Appliance Fans

3 Description

The TMP816 is a single-phase bipolar variable-speed

fan-motor predriver that works with an external PWM

signal. A highly efficient, quiet, and low-power

consumption motor driver circuit with a large variable speed can be implemented by adding a small number

of external components.

The TMP816 device is optimal for driving large-scale

fan motors (with large air volume and large current)

such as those used in servers and consumer

products.