www.st.com key applications ? compressed natural gas (cng) electronic injection systems key fe atures ? power mos, protections, diagnostic and i 2 c interface circuits in a single device ? closed-loop current control of solenoid current ? programmable injector current profle (timing and current amplitude) key benefits ? improved system reliability and enhanced diagnostics ? intrinsic compensation of cng injection over ageing effects, battery voltage, temperature drifts and injector production spreads ? higher system effciency ? easier compliancy with more stringent co 2 emissions standards L99SD01 integrated solenoid driver for cng electronic injection systems the L99SD01 represents the state of the art in cng electronic injection systems. thanks to its high level of integration, all the circuits needed to reliably and accurately drive the injector coil are integrated into the same device. the embedded closed-loop current regulator gives a high level of precision in cng injection previously not reachable, resulting in an augmented reliability and a much easier compliancy with stringent co 2 emissions standards such as euro 6. automotive-qualifed device for accurate and effcient control of compressed natural gas (cng) injection systems
? stmicroelectronics - january 2015 - printed in united kingdom - all rights reserved the stmicroelectronics corporate logo is a registered trademark of the stmicroelectronics group of companies all other names are the property of their respective owners for more information on st products and solutions, visit www.st.com order code: flL99SD010115 L99SD01 application and d evice block diagram part number s1 and s2 r dson maximum load current coil current profle and timings switching operations L99SD01-e 60 m (maximum @ 25 c) 14 a fully programmable above 10 khz L99SD01: state of the ar t for cng electronic injection sy stems in addition to guaranteeing fuel injection integrity in any condition of battery voltage, system age, temperature and kind of injector, the latest standards on co 2 emissions (e.g. euro 6) raise the bar of the performances required for electronic injection systems in terms of precision in the control of both the current fowing in the injector coil and the dwelling-time. moreover, the automotive requirements for higher reliability and better diagnostics, complement the design challenge making it even more diffcult. thanks to sts system-in-package approach, which integrates the required power mosfets as well as the control and the diagnostic circuitries in a single device, the L99SD01 naturally provides higher reliability and system protection. additionally, the integrated closed-loop control of the injector coil allows reaching the minimum current required to ensure the proper injector coil behavior at any battery voltage, temperature, injector production spread and age. the L99SD01 can be used without any re-programming if the default values of the internal registers match the target application. on the contrary, if its required to customize the current control loop and its related timings, the dedicated i 2 c interface can be used to properly confgure the device. the L99SD01 represents the state of the art in cng electronic injection systems: more reliable, more effcient, and more compact. mcu protection and diagnostics L99SD01 v bat s2 s1 i 2 c current control circuitry powersso-36
|
