The LTC3780 is a high-performance buck-boost switching regulator controller that can operate with input voltages that are higher, lower, or equal to the output voltage. This versatile device uses a constant-frequency current-mode architecture, allowing for phase-lockable operation up to 400kHz. With an extensive input and output range of 4V to 30V (with a maximum of 36V), the LTC3780 seamlessly switches between different operating modes, making it well-suited for applications in automotive, telecommunications, and battery-powered systems.
The operating mode of the LTC3780 is controlled by the FCB pin. For boost configurations, this pin allows selection between Burst Mode, Discontinuous Mode, and Forced Continuous Mode. During buck operation, it offers options such as Skip Cycle Mode, Discontinuous Mode, and Forced Continuous Mode. These modes ensure efficient performance under light loads when using Burst or Skip Cycle Modes, while Forced Continuous and Discontinuous Modes maintain a constant frequency for more stable operation.
The LTC3780 includes a power failure protection circuit designed to enhance system reliability. It features an output overvoltage comparator and an internal foldback current limit circuit to prevent damage from abnormal conditions. Additionally, the Power Good output pin signals when the output voltage remains within 7.5% of its intended adjustment point. The following diagram illustrates a typical application setup for the LTC3780.
A switching power supply circuit was designed based on the LTC3780 controller, featuring a 24V input, 26V output, and a 300W capacity. After completing the initial design, the circuit was simulated using LTspice IV software. The schematic used for simulation is shown in Figure 2. Voltage waveforms and ripple at full load are illustrated in Figures 3 and 4. Furthermore, the output voltage and current waveforms from light load (1A) to full load (12A) are presented in Figure 5, demonstrating the controller's stability and performance across various load conditions.
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