This application note provides a detailed analysis of the current regulated channels of the ST coil driver L9352B. This intelligent quad-low side switch is typically used to drive inductive loads such as on-off valves of the hydraulic modulator of ABS(a)/ESP(b) control unit.
The document provides a detailed analysis of the current regulated channels in the L9352B intelligent quad-low side switch. This device is designed to drive inductive loads, such as on-off valves for hydraulic modulators in Antilock Brake System (ABS) and Electronic Stability Program (ESP) control units.
The note describes a test bench layout used to characterize the current control channels of the L9352B. It presents linearity relationship tests comparing ideal linear relationships with experimental data under different load conditions, specifically analyzing coils on valves versus stand-alone coils.
The L9352B is designed to drive inductive loads such as relays and electromagnetic valves in a low side configuration.
A PWM signal with a 2 kHz frequency on the input defines the target for the output current.
For a duty-cycle greater than 16%, it is possible to consider a current control accuracy of 6 %.