TX861
TX861 provides an integrated brush DC motor drive solution for battery-powered toys, low-voltage or battery-powered motion control applications. The circuit integrates on-chip H-bridge drive circuit designed with N-channel and P-channel power MOSFETs and is suitable to drive a brushless DC motor or a stepper motor winding. It has the wider operational voltage range (from 2V to 12.0V), its maximum continuous output current is up to 2A, and its maximum peak output current is up to 4A.The series circuit powered by VCC and VDD separate , which VCC is logic and control power supply, VDD is power supply.
TX861 has on-chip temperature protection function. When the load current of the drive circuit is much larger than the maximum continuous current of the circuit, the junction temperature of the circuit will be increased rapidly. Once the set value (150℃) is exceeded, the internal circuit will be closed immediately Off the output power tube, cut off the load current, to avoid the temperature continued to rise caused by plastic packaging smoke, fire and other security risks. Built-in temperature hysteresis circuit to ensure the circuit is restored to a safe temperature before allowing the circuit to be re-controlled.
TX861 set a separate current sampling output pin, sampling output current sampling ratio of 1000: 1. The output sampling current for MCU analysis or control the external circuits to control the output current.
Features
Built-in current sampling circuit
Low standby current, low static operating current
Integrated H-bridge drive circuit
Built-in anti-common mode switching-on circuit
Low on-resistance power MOSFET
Maximum continuous output current： 2A@VDD=12V
Maximum peak output current：4A@T=0.2S，D=0.25，VDD>=6V
Instantaneous withstand current：7A@VDD=6V，about 10us
On-chip thermal shut down(TSD) with hysteresis
Anti-static grade：3KV (HBM)
Typical application
Toy motor drive with 2-4 AA / AAA dry cells;
Toy motor drive with 2-6 Ni-H / Ni-Cd rechargeable batteries;
Toy motor drive with 1-2 Lithium-ion battery
