How to Design an Efficient DC-DC Converter Using the DS1875 PWM Controller - Application Note - Maxim
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چکیده
The DS1875 features a pulse-width modulation (PWM) controller that can be used to control a DC-DC converter. The DC-DC converter can then be used to generate the high bias voltages necessary for avalanche photodiodes (APDs). This application note describes the operation of a boost converter that uses the DS1875. Discussion covers the selection of the inductor and switching frequency, and the selection of components that improve the efficiency of the converter. Test data are presented. Overview The DS1875 features a pulse-width modulation (PWM) generator that can be used to control a DC-DC converter. In a typical application the PWM controller is used in a boost converter to generate biasing voltages for avalanche photodiodes (APDs). The PWM controller in the DS1875 can operate in either continuous or discontinuous conduction modes. To generate the high bias voltage needed for APDs, the DC-DC converter must operate in discontinuous mode. Figure 1 shows a simple boost converter using the DS1875 PWM controller. This application note describes the operation of a boost converter with the DS1875. The article explains how to select both the inductor and switching frequency, and then the components that will improve the converter's efficiency.
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