STR-A6159M

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 The STR-A6159M is part of the PMIC - AC DC Converters, Offline Switchers family of integrated circuits that can be used in both commercial and industrial applications. This device integrates a high-voltage Power MOSFET, primary-side current sensing, and secondary-side overcurrent protection, as well as various other protection functions. The device has various application fields, including keeping powered electronics alive in shutdown states during a power outage, providing standby power for an entertainment system, providing a relay\'s contact protection against overvoltage, and even supplying a household electric appliance with energy.

The device operates in two different control modes: fixed duty mode and frequency mode. In fixed duty mode, a reference signal is given from an external resistor to control the duty cycle of operation. In frequency mode, the frequency of operation is set using a capacitor. The device can operate in a frequency range of 40kHz to 1kHz, and the duty cycle setting can be adjustable between 0~99%.

STR-A6159M is composed of several components. It has a start-up resistor to set the switching frequency, a power MOSFET that supplies power to the secondary side, a primary-side current sensor, secondary-side overcurrent protection components, soft-start capacitor, and an enable pin. The device also has a high-voltage startup circuit, overload protection, and thermal protection that prevents high temperature damages.

The power MOSFET is controlled by the high-voltage start-up circuit, which conditions the gate drive signal for proper operation, and the feedback from the primary-side current sensor is used to adjust the duty cycle in fixed duty mode. During operation, the feedback from the current sensor is used for current limitation and to monitor overcurrent conditions, and the secondary-side overcurrent protection components protect the relay and load from excessive current.

The device is resistant to impulse voltage and also has a two-level overvoltage protection to protect itself and the system from any overvoltage event. The thermal protection prevents the device from overheating and turning off if the temperature exceeds a certain value. Additionally, the device has an advanced soft-start capacitor that prevents the power MOSFET from switching too quickly and reducing switching losses.

In conclusion, the STR-A6159M is an excellent choice for AC-DC converter and offline switcher applications. It provides reliable and efficient operation, protection from overvoltage and overcurrent, and is easy to use with its adjustable duty cycle feature and programming interfaces. Its resistance to impulse voltages makes it a great choice for situations where a quick response is needed, such as protecting a relay or load from an unexpected spike in current or voltage.

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