Abstract
The current regulation loop drives squibs that are used to inflate multiple airbags in cars. Squibs are electrically R-L-C networks with the resistance ranging from 1 Ω to 8 Ω. The inductance range varies from 1 μH to 3 mH and the capacitive loads range from 22 nF to 220 nF. The high-voltage LDMOS transistors are used as the HS and LS FETs. The specified currents are 1.2 A for 2 ms, 1.75 A for 0.5 ms or 0.7 ms and an optional mode of 1.2 A for 1.5 ms. In this chapter, the advantages and disadvantages of current sense circuit with sense resistor and senseFET approaches are compared. Based on this comparison, this chapter shows how the targeted current regulation is achieved for the HS driver by using the sense resistor-based approach along with the energy limitation circuit for inadvertent deployment protection.
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Easwaran, S.N. (2018). High-Side Current Regulation and Energy Limitation. In: Current Sensing Techniques and Biasing Methods for Smart Power Drivers. Springer, Cham. https://doi.org/10.1007/978-3-319-71982-5_4
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DOI: https://doi.org/10.1007/978-3-319-71982-5_4
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