This application note describes the virtual current control loop for the L9374-L9375 coil driver kit in ABS-ESC control unit.
The document proposes a coil driver kit composed of the L9374 and L9375 chips for new generation ABS/ESC control units. The L9374 is a smart quad low side driver with two current regulated channels, while the L9375 is an octal low side driver with four PWM channels. To achieve six current-regulated channels as required by conventional hydraulic modulators, a software library implemented on an ST10252M microcontroller creates a virtual current control loop.
| L9374 Channels Type | Smart quad low side driver with 2 current regulated channels and 2 PWM channels |
|---|---|
| L9375 Channels Type | Octal low side driver having 4 PWM channels and 4 conventional on-off switch channels |
| Microcontroller Used | ST10252M |
The accuracy of the two current regulated channels in the L9374 is about 6%.
The SW library for the virtual current control loop is implemented by the ST10252M microcontroller.
The L9374-L9375 kit provides 6 current regulated channels through a virtual control loop.