Infineon's MOTIX™ MCU (SoC) series integrates LDO, MCU, bridge driver, current sense amplifier, CAN/LIN transceiver, and high-voltage detection into a complete motor control solution, with over a decade of automotive small motor deployment. Infineon's 7th-generation automotive MOSFETs cover 40V to 150V in multiple packages and on-resistance versions, meeting most small motor needs. The new low-cost TLE995x features next-gen bridge pre-driver technology and can pair with 7th-gen MOSFETs to form a compact, reliable BLDC motor control system.
Automotive electrification and intelligence demand lower noise, higher efficiency, and faster dynamic response from small motors, making BLDC motors widely adopted. A recommended reference design uses the MOTIX™ TLE9954 SoC with three dual-die MOSFETs plus an IAUZN04S7N032 reverse-polarity protection MOSFET for a cost-effective small motor controller. Two MOSFET packages are available: Dual-SSO8 and HB-SSO8. Dual-SSO8 supports up to 60A DC, while HB-SSO8 reaches 100A DC with an integrated half-bridge structure, eliminating external PCB traces for compact designs. Dual-SSO8 offers better cost advantage where PCB space allows.
Motor control involves bidirectional current. During dead time, high- and low-side MOS are both off, and current freewheels through the MOS body diode. The pre-driver uses SH voltage to identify freewheeling status, making pre-driver and MOS matching critical. Board-level testing with the IAUCN04S7N040H observed MOS switching waveforms and tuned parameters. In default configuration, low-side turn-on is about 200ns, and the high-side GS shows a ~3V voltage spike during the Miller plateau. Using the chip's built-in SH time measurement, engineers set a target switching time and the system auto-adjusts driver parameters to reach the target Ton. Three tests at 200ns, 300ns, and 400ns showed the high-side GS spike dropping to 1.6V and 1.2V as turn-on time lengthened.
Longer turn-on time suppresses voltage spikes but extends the Miller plateau, increasing switching loss. Designers must balance spike suppression and power loss. With TLE9954 current control technology and 7th-gen MOSFETs, this combination offers a more cost-competitive integrated control solution for automotive small motors.
ICgoodFind: Infineon's TLE995x with 7th-gen automotive MOSFETs simplifies automotive BLDC small motor hardware design, letting developers balance voltage spikes and switching loss through drive timing optimization.
