THB6128 is a high-precision two-phase hybrid step motor driver chip with double full-bridge MOSFET drive, low on-resistance Ron = 0.55Ω, maximum voltage 36VDC, large current 2.2A (peak), multiple subdivisions available (1, 1/2, 1/4, 1/8, 1/16, 1/32, 1/64, 1/128), automatic half-flow locking function, fast decay, slow decay, hybrid decay Three decay modes can be selected, and internal temperature protection and overcurrent protection are available.
This manual describes the THB6128 hybrid stepping motor driver chip, including its pinout, electrical parameters, and functional features such as microstepping, decay mode selection, and standby operation. Detailed tables list maximum ratings, operating ranges, and characteristic curves for designers.
The document also explains how to configure the driver via pins for enable, reset, direction, and current setting, and provides guidelines for setting chopping frequency and protecting against short‑circuit conditions. Contact information for the manufacturer is included at the end. This manual is written in Chinese.
| Maximum supply voltage | 36 V |
|---|---|
| Maximum output current | 2.2 A |
| Maximum logic input voltage | 6 V |
| VREF maximum input voltage | 3 V |
| Operating temperature range | -20 °C to 85 °C |
| Storage temperature range | -55 °C to 150 °C |
| Logic input voltage (operating range) | 4.5 V to 6 V |
| Supply voltage (operating range) | 9 V to 36 V |
| Output current (operating range) | 0 A to 2 A |
| Current reference voltage range | 0 V to 3 V |
The ENABLE pin is active low; when it is low the output is forced off, and when high the driver operates normally.
Microstepping is selected using the ML, M2, and M3 pins; each pin corresponds to a specific division factor such as 1/2, 1/4, 1/8, etc.
Pull the RESET pin low; this forces the output to its initial mode and clears the position detection logic.