LTC3780 The LTC3780 is a high performance buck-boost switching regulator controller that operates with input voltages above, below or equal to the output voltage. The constant frequency current mode architecture provides a phase-lockable frequency up to 400kHz. With a wide input and output range of 4V to 30V (36V maximum) and seamless switching between different operating modes, the LTC3780 is ideal for automotive, telecom and battery-powered systems. The operating mode of the controller is determined by the FCB pin. For boost applications, the FCB mode pin is capable of selecting between Burst Mode, Discontinuous mode, and Forced Continuous mode. The FCB mode pin selects between skip cycle mode, discontinuous mode, and forced continuous mode during buck operation. Burst mode operation and skip cycle mode provide efficient operation under light load conditions, while forced continuous mode and discontinuous mode operate at a constant frequency. LTC3780 power failure protection circuit Fault protection is provided by an output overvoltage comparator and internal foldback current limit circuit. The power good output pin will signal when the output is within 7.5% of its design adjustment point. The picture below shows his typical application. LTC3780 power switching power supply circuit Based on the LTC3780 controller, the 24 V input, 26 V output, and 300 W switching power supply are designed. After the principle design was completed, it was simulated using LTspice IV simulation software. The schematic diagram of the power supply simulation is shown in Figure 2. The voltage waveform and ripple at full load are shown in Figure 3 and Figure 4. The output voltage and current waveform of the switching power supply of the LTC3780 controller from light load (1 A) to full load (12A). See Figure 5. Banknote Value Counting Machine Two CIS Banknote Value Counting Machine,Banknote Value Counting Machine Two CIS,Two CIS Suzhou Ribao Technology Co. Ltd. , https://www.ribaoeurope.com
