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The PMP20904 reference design is a negative buck utilizing the LM5117 controller for industrial applications. This design can operate at 24Vin at +/-10%. The design has an output of -24V and capable of sourcing 2A continuous current and up to 4A transient. Switching frequency is set to 200kHz, and a 4 layer PCB is used.
Hi
输入电压范围超过48V, 输出电流能力超过10A的降压芯片，如上面的LM5117之类的降压芯片都可以用来做负压输出的芯片。在原有buck拓扑的基础上将输出接到GND，那么此时的GND就变化成为负压，架构也就变化成为buck-boost.设计方式如下：www.ti.com.cn/.../slva317b.pdf （TPS54160并不适合，因为电流太小，这里只是提供给你用于做负压的思路，寻找其他输入电压范围超过48V, 输出电流能力超过10A的降压芯片。）
