4.5 W Non-Isolated Buck Power Supply
本设计用于提供非隔离额定输出电压为15 V，负载为300 mA，输入电压范围为60VDC至550 VDC用于汽车应用，非常值得尝试。
主电路
The schematic in Figure 2 shows a buck converter using LNK3206GQ. The circuit provides a non-isolated 15 V, 300 mA continuous output. In this design, automotive battery will be the intended input source of the buck circuit. To simulate battery stiff voltage source, bulk capacitors was added in the test setup during the test as shown in Figure 3. The LinkSwitch™-TN2 family of ICs for automotive power supplies provide significant reduction in component count compared to traditional discrete solutions. Regulation is achieved using a low cost resistor divider feedback network. The switching frequency jitter feature of the LinkSwitch-TN2 family and the 66 kHz switching frequency of operation helps reduce EMI. Each device incorporates a 750 V power MOSFET, oscillator, On/Off control, a high-voltage switched current source for self-biasing, frequency jittering, fast (cycle-by-cycle) current limit, hysteretic thermal shutdown, and output and overvoltage protection circuitry onto a monolithic IC. LinkSwitch-TN2 ICs consume very little current in standby resulting in power supply designs that meet <50 mW no-load input at 400 VDC input. A full suite of protection features enable safe and reliable power supplies protecting the device and the system against input and output overvoltage faults, device over-temperature faults, lost regulation, and power supply output overload or short-circuit faults. Due to automotive application, all component selected are AEC compliant.
PCB设计也很简单，有兴趣可进一步到PI官网了解。
