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.