UC3845BVD1R2

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The UC3845BVD1R2 is a DC/DC switching controller that enables the design of high-performance, low-cost and low-power DC/DC converters. The UC3845BVD1R2 offers greater system stability, improved transient response and excellent accuracy. It features a programmable frequency adjustment, adjustable soft-start, adjustable peak current limit and protection circuits, and very fast current limiting. This controller can be used with a wide range of external power devices to cover almost any controlled buck, boost or flyback topology.

Applications

The UC3845BVD1R2 controller can be used in many applications, including AC-DC converters, DC-DC converters, lighting system control and communication devices, automotive mass storage systems, display devices, battery chargers, start-up circuits, voltage regulation and other switching power supply designs.

Working Principle

The UC3845BVD1R2 DC/DC switching controller is a fixed frequency pulse-width-modulated (PWM) controller. It sees a voltage signal, produced by a voltage divider across the output of the power supply, and compares it with an internally generated 0.8V reference signal. If the signal from the voltage divider is greater than 0.8 V, then the output of the error amplifier is low, and the signal goes to the PWM comparator. This causes the chip to set the output signal high and the power device connected to it is turned on. If the signal is lower than 0.8 V, then the output of the error amplifier is high and the signal goes to the PWM comparator. This causes the chip to set the output signal low and turns off the power device.

The UC3845BVD1R2 also features a programmable frequency adjustment and adjustable soft-start function, which helps reduce inrush current while the device is being powered up. It also offers an adjustable peak current limit and protection circuits, which reduces system instability and improves transient response. The implemented current limit circuit is very fast and accurate, with up to ±1 mA accuracy on peak current.

The UC3845BVD1R2 provides a wide range of external components and very simple external circuitry, resulting in a simplified design and lower system cost. It is also supported by a wide range of development tools, including power supply design tools, reference designs, PSpice simulation models and application notes.

Conclusion

The UC3845BVD1R2 DC/DC switching controller is a high-performance and low-power device that enables the design of low-cost and reliable DC/DC converters. It features programmable frequency adjustment, adjustable soft-start, adjustable peak current limit and protection circuits, and very fast current limiting. The controller can be used in many applications, including AC-DC converters, DC-DC converters, lighting systems control and communication devices, automotive mass storage systems, display devices, battery chargers, start-up circuits, voltage regulation and other switching power supply designs.

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