S-8337ABIB-P8T1G

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The S-8337ABIB-P8T1G from Sanken is a high-performance switching regulator controller IC designed for applications that require voltage regulation over a range of input and output voltages. The S-8337ABIB-P8T1G is capable of providing up to 2A of continuous current and features built-in over-temperature and over-voltage protection.

The device utilizes a single-ended forward converter topology, allowing for high power conversion efficiency, using a switching architecture that minimizes external components while providing robustness and reliability. The converter is operated in pulse-width modulation (PWM) mode and can be configured as either a buck, boost or buck/boost regulator, with an average efficiency of up to 95%.

The device features an internal MOSFET driver which provides an adjustable off-time characteristic for improved EMI, as well as frequency folding circuitry for improved system efficiency. The S-8337ABIB-P8T1G also features a tracking output voltage error amplifier and a programmable overvoltage circuit for protectively limiting the output voltage.

The S-8337ABIB-P8T1G DC-DC switching controller is ideal for applications where space is at a premium, such as high density, portable equipment and embedded systems. Applications include power supply systems for consumer electronics, as well as industrial, automotive and medical-grade applications.

Working Principle

The S-8337ABIB-P8T1G switch controller works by utilizing the Pulse-width Modulation (PWM) technique to create the output voltage. The PWM technique works by rapidly switching a DC input voltage to the output with a duty cycle that is proportional to the desired output voltage.

The internal MOSFET driver is used to create the on/off switching of the PWM signal. The driver is adjustable and allows users to adjust the off-time characteristics which can help reduce noise and EMI. Additionally, the device also features frequency folding circuitry which allows for improved system efficiency.

The controller also features an internal tracking error amplifier which is used to compare the output voltage to the desired target voltage. If the voltage is too high, the error amplifier sends a signal to the duty cycle generator to reduce the duty cycle and thus the output voltage. Conversely, if the voltage is too low, the duty cycle is increased to compensate.

The controller also features an integrated overvoltage protection function which protects the output voltage from going above a certain limit. This function is adjustable and can be programmed and monitored via an SPI interface.

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