Power Semiconductors

STMicroelectronics Announced New Flexible Motor Drivers for Low- to Mid-Power Applications

10 September 2018

STMicroelectronics announced the release of two motor control chips geared toward the design and implementation of low- to mid-power applications such as medical technology and home appliances.

Source: STMicroelectronicsSource: STMicroelectronics

The single chips STPIN830 and STPIN840 contain flexible logic control and low RDS(ON) power switches. The STPIN830 is a compact field-oriented control (FOC) for three-phase, brushless DC motors and comes with a mode-setting pin that allows the control of the three half-bridges of the integrated power stage with direct U, V and W pulse-width modulated (PWM) inputs. In addition, the users can apply signals to each gate individually.

The compact DC motor driver STPIN840 can drive two bidirectional brushed DC motors simultaneously or one large motor thanks to a parallel input pin. With this pin the parallel function is enabled, making the chip a powerful single full-bridge capable of delivering up to 3 Arms current at equivalent RDS(ON) of 500 milli-Ohms.

Both chips can be set to a low operating state where no more than 45 uA of current is consumed, and are packaged in a small 4 mm x 4 mmQFN package.

Some key specifications of the devices are:

  • Operating voltage from 7 to 45 V
  • Maximum output current 1.5 Arms
  • RDSon HS + LS = 1 Ω typ.
  • Supporting both single and three shunts architectures
  • Current control with adjustable off time
  • Current sensing based on external shunt resistors
  • Flexible driving methodology: user settable between six inputs (high side and low side driving) and three inputs (direct PWM driving)
  • FOC compatible thanks to three shunts sensing topology support
  • Full protections set:
    • Non-dissipative overcurrent protection
    • Short-circuit protection
    • Undervoltage lockout
    • Thermal shutdown
    • Interlocking function
  • Low standby current consumption

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