直流直流电压调节器：如何选择之间的离散和模块化设计

　　直流/直流电压调节器：如何选择之间的离散和模块化设计

　　有许多令人信服的理由选择一个模块化的开关直流/直流电压调节器的设计，而不是传统的控制器与外部元件-一个离散的稳压器设计。这些措施包括改进了上市时间、降低了总体设计成本、降低了组件成本、更紧凑的设计、更好的可靠性和更低的噪音。然而，有时一个离散的设计是更好的选择。

　　离散是如何离散的？

　　设计一个简单的可能，非隔离开关DC/DC稳压器从无到有仅仅使用分立元件。要做到这一点，设计师需要脉冲宽度调制（PWM）控制，电流开关，电感储能。

　　然而，在实践中，很少有来自调节器的设计，因为廉价，紧凑和可靠的控制器芯片广泛使用。

　　Contemporary discrete regulator designs typically comprise a controller chip. These can be found from companies such as National Semiconductor， Fairchild Semiconductor， and Maxim Integrated Products that allied to deliver discrete components with FETs for gate drivers， inductance and capacitance.

　　However， modern integration technologies allow semiconductor vendors to introduce modular regulators. These chips typically integrate everything except the energy storage capacitor， which is difficult to include on the die because its value is more than 1 µF.

　　The design time and effort required to construct a regulator using an integrated module is clearly lower than a discrete design. However， there are some situations when discrete design is advantageous， such as when high efficiency at a specific operating point is a prerequisite.