Constant Current Control IC for Transmission
Constant current regulation with high accuracy for inductors for automotive applications
Infineon provides a range of constant current drivers for inductive loads for various automotive applications, including but not limited to: Driving solenoids in automatic transmission, active suspension and electronic stability controls. The high accuracy regulators are capable to drive constant currents in up to eight inductors. Whereas each channel current can be programmed individually via SPI interface. On top there are sophisticated monitoring and diagnosis functions to support functional safety concepts. Pre-Drivers with external MOSFETs allow to regulate inductor currents higher than 1.5A.
Infineon´s solution for variable force or constant current controlled solenoids typically used in automatic transmissions, Idle Speed-/ valve- / suspension control or exhaust gas recirculation applications.
An inductor stores magnetic energy, which generates high negative transients when being switched off.
The challenge is to discharge the energy in a way that the switch or driver is not destroyed by the negative voltage spikes.
Infineon’s constant current drivers for inductors include a protection circuit that keeps the voltages within the
In order to achieve low power dissipation a switched regulation scheme with a constant frequency is applied.
The regulator achieve an current accuracy of 1% and below.
Inductors are parts of actuators as solenoids, electromechanically switches or relays. But also Motors represents inductive loads. Such solenoid actuators are being used in automatic transmission, active suspension and electronic stability controls.
Once programmed the inductive driver is taking care to regulate the specified current through the inductors by applying a PWM signal. So no external regulation loop is required. The constant current settings can easily be programmed via SPI interface.
At Pre driver the switching device is not integrated. The main advantage is that the power dissipation is distributed over the PCB and currents higher than 1.5A can be achieved.
The new ICC Tool can be downloaded via the Infineon Toolbox.
The ICC Tool offers three design-in tools to ease and accelerate the understanding of Infineon´s new solenoid driver family TLE92464ED and TLE92466ED.
- The ICC Simulator helps to understand the characteristics and configuration options related to the solenoid´s driver current controller ICC (integrating current controller).
- The Current Feedback provides a real-time based data set read back in combination with the Evaluation board. The measurement data of the IC´s functional safety feature "current supervision" is plotted in intuitive graphs.
- The Dither Calculator enables a quick and easy configuration of the desired dither waveform.
The embedded user manual provides not only a quick start guide but also advanced information on transmission-specific topics and IC features.