The Holtek device range includes a power tool controller MCU, the HT45F4630, which is especially designed for motor speed control products, such as electric drills, electric screwdrivers, lawn mowers and other similar products. Holtek provides here a practical reference solution to help users with the rapid development of such products.

Power tools usually need some basic controlling functions including speed control, over temperature protection and battery over current protection. This Holtek power tool speed control solution provides a group of PWM high voltage and large current output pins which can directly drive Power MOS transistors to reduce their switching losses. Additionally, the device includes integrated over current protection and detection functions and an amplifier which allows the input signal to be amplified by 51 times, requiring a lower value current sense resistance value which will increase the overall efficiency and extend the operating time. When an over current event occurs, the PWM switching will be shut off by hardware to achieve immediate protection.

The associated technical documents can be obtained by clicking on the adjacent link. Holtek also provides users with all required technical support related to the emulation, including circuits, host software and PCBs, etc.


Application Areas

Electric drills, electric screwdrivers, lawn mowers and other products with motor speed control requirement.


Minimal external components and lower costs

Save on external MOS driving circuits and reduced number of required external components and costs.


Multiple protection mechanism, high reliability

Internal over current protection and detection functions provide immediate hardware protection to enhance product reliability.



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System Architecture and Connection Diagram

With a high level of functional integration, the number of required external components as well as the PCB size can be reduced thus reducing overall product costs. This reference design provides the following circuits, which include internal level shifter for gate driving motor power MOSFETs, 12-bit A/D converter for measuring the control resistance to achieve speed measurement control and other hardware protection circuits for motor and battery protection.

(C20004-A1.ZIP) Electric Tool Speed Regulators
Description Files Solution Description and Application Notes
Application Circuits Protel format
PCB Protel format
Block Diagram PDF
Code Source code
Component List   Excel format


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