Why not only change the output voltage of the SMPS (that's easy) and add an external linear current limiter (also very easy, 2 pnp's transistors with heat sink, a 0R6 resistor more two other resistors). Power dissipation will be max. 15W, that's acceptable. 15W of heat extra is 15W too much. current limit feature and a monotonic output voltage ramp, which significantly eases the system level power-supply design. This application report explains how the TPS720xx inrush current limit is different from other inrush limit schemes in that it is always limited to a fixed value in addition to the load current demand. The fixed value of Adding a Current Limit Feature to a Buck/Boost Converter: In this project we will have a closer look at a common buck/boost converter and create a small, additional circuit that adds a current limit feature to it. With it, the buck/boost converter can be used just like a variable lab bench power supply. Le… Because of the power dissipation capability of 2N3055 transistor, at the worst case that the load is shorted to ground (zero resistance), if you limit the current to 8.4 A then the circuit can handle maximum source voltage of 14V, while limiting the current at 4.2A can handle up to 27V source voltage. 限流(current limiting)和電流折返(current foldback) (參考原文：Do You Have the Right Power-Supply Protections?，by Bill Schweber) 活動簡介 Arrow聯合Wolfspeed、NXP、Skyworks和Bourns共同合作，開發了一款專為碳化矽快速測試而設計的套件。 此套件的目標是幫助客戶加速碳化矽(SiC)相關 If the power supply has a fast-reacting over-current limit, the high peak inrush current could cause it to go into shutdown or overload protection. At t=0, the exponential is unity so the only limitation on the input current is the resistance R and the current capability of the power supply. At t >>1, the exponential is zero and the input .

power supply with current limit