100W System-Level Power Reference Design for Automotive Infotainment System (PMP10749)
PMP10749 is a 100-W system-level SMPS design for a higher-power automotive infotainment system. The design has protections, such as load dump through TVS (ISO pulse testing), as well as reverse voltage (innovative smart diode with very low Iq) protection. Furthermore, all the controllers (boost and dual bucks) are in SYNC for EMI-optimized design. The design is divided into four major blocks: Protection: Reverse battery protection through efficient smart diode and automotive transient protections through TVS. EMI filter: 14-A common modes choke at front end with a differential filter for conducted EMI suppression. Preboost: Highly efficient synchronous preboost design for 100-W application. The output is maintained at 10 V and when Vin > Vout , the output follows the input and true bypass operation is achieved. Dual buck controller: 2.2-MHz switching for AM band avoidance, as well as small size solution. Supports two outputs: 5 V at 10 A, as well as 3.3 V at 10 A. The syncout of controller is used to sync boost at F/10 frequency.
2.2-MHz switching for SYNC buck controller – avoid AM band + smaller size Wide Vin support for automotive application Cycle-by-cycle current limit and optional hiccup-mode overload protection Low-cost and high-efficiency solution for 100-W application Smart diode for highly efficient reverse battery protection
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