STR-W6072S

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Introduction: The STR-W6072S is an offline switcher power supply which integrates high voltage power MOSFET, a high-performance on-time control IC, and other components into a LSOP16 package. This device is routinely used as an integrated switching regulator for DVD, DVD+VCR Combo, DVD+DVD Combo and home theater systems. It is also used in low power equipment such as printer, scanner, set-top boxes, digital cameras, LCD monitors and other consumer electronics products.

Application Field: STR-W6072S is an offline switcher power supply that integrates high voltage power MOSFET and a high-performance on-time control IC with other components. This device is designed for use in DVD, DVD+VCR Combo, DVD+DVD Combo, home theater systems, and other low-power equipment.

Working Principle: The STR-W6072S power supply uses a high voltage MOSFET which acts as a switching element which, when turned on, provides power to the load from Vin. Once power needs to be turned off, the MOSFET is turned off and the load is disconnected from Vin. The high voltage MOSFET is driven by an on-time control IC. The operation is based on a peak current mode control and regulates output voltage with a high accuracy of ±3%. The output voltage is set with an external resistive voltage divider. The on time control is also responsible for the switching frequency and current sense features.

Over Voltage Protection: The STR-W6072S is equipped with an over voltage protection (OVP) circuit to protect the load from excessive voltage conditions. The OVP circuit monitors the output voltage and if it exceeds the preset threshold (normally 140% of the output voltage), the OVP circuit triggers and turns off the MOSFET. The device also features an over temperature protection (OVP) that monitors the output voltage to ensure the operations are within a safe temperature range.

Over Current Protection: In order to protect the load from over current conditions, the STR-W6072S utilizes an over current protection (OCP) circuit that limits the output current of the device. When the output current reaches the preset threshold, the OCP circuit will shut down the switch controller until the current falls below the threshold. The OCP threshold can be adjusted via the current sense pin.

Under Voltage Protection: The device has an under voltage protection (UVP) circuit for situations when the voltage at the Vin falls below the preset threshold. When the Vin voltage drops below the threshold, the UVP circuit will turn off the switching controller until the voltage rises above the preset level.

Soft-Start Function: The STR-W6072S also comes with a soft-start function which is used to reduce the in-rush current at start up. This feature helps to limit the power dissipation on the MOSFET while it turns on. The soft-start time can be adjusted by the voltage on the RT pin.

Power Good Output: The device has a power good output signal which is used to indicate the presence of power at the output. The power good signal also provides additional protection in case of output overvoltage or overcurrent. This signal is used as a status indicator for the connected equipment.

Conclusion: The STR-W6072S is an excellent offline switcher power supply which integrates a high voltage power MOSFET and a high-performance on-time control IC with other components. It provides excellent performance in terms of efficiency and protection, with an accurate output voltage regulation of ±3%. This device is designed for use in home theater systems and other consumer electronics products, and comes with several additional features, such as over voltage protection, over current protection, under voltage protection, soft-start, and power good output.

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