![]() The flowchart in Figure 1b shows how a push-pull converter can be designed in eight simple steps. Push-Pull DC/DC Converter Design For Wide Ranging Input This article presents two step-by-step design procedures: One for a push-pull DC/DC converter with a wide input range, the other for a compact high frequency transformer driver with fixed input voltage. The LT3999 combines these two features with high 36V input voltage and 1A input current capabilities, making it a high power and flexible low noise push-pull converter IC. High switching frequency, up to 1MHz, leads to smaller transformers and lower output ripple.Duty cycle control allows compensation for wide V IN variation-something standard fixed duty cycle transformer drivers cannot do-greatly reducing LDO loss when facing a wide input range.The LT3999 monolithic DC/DC push-pull driver avoids these issues with two important features: duty cycle control and high frequency operation: Second, low switching frequency requires relatively bulky transformers, sometimes occupying 30% to 50% of the converter space. First, any significant variation in the driver’s input voltage, along with the fixed 50% duty cycle, can increase the differential voltage across the LDO, resulting in significant power losses and high temperature rise in the LDO. This simple scheme provides no voltage regulation-requiring a low dropout (LDO) post regulator-a combination that presents potentially serious problems. How to Design an Isolated, High Frequency, Push-Pull DC/DC ConverterĪ simple push-pull DC/DC converter with a fixed 50% duty cycle is often used as a low noise transformer driver in communication systems, medical instruments and distributed power supplies. ![]()
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March 2023
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