STR-W6556A

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Power semiconductor devices such as MOSFETs, IGBTs and rectifiers are key components of power conversion systems and are necessary for power management work. So a good performance power management chip is also essential. STR-W6556A, developed by Alps, is one of the most commonly used power management ICs (PMICs). It is designed for AC and DC converters, and offline switchers.

The typical application field for STR-W6556A is for high voltage AC-DC and DC-DC conversion systems. It integrates several power management functions into the IC including a main switch driver, main switch protector, main switch feedback and soft-start/soft-off functions, which makes it an ideal choice for applications such as monitor PC, LCD TV and portable equipment for charging. STR-W6556A also has a built-in over-load protection circuit, temperature protection and fault detection output, to protect the IC and the system during abnormal conditions.

STR-W6556A chip includes a built-in standby control circuit, which is a major advancement in the voltage regulator IC. This circuit utilizes adaptive off-time control to achieve constant auto-restart while preventing come-back current following a short circuit situation. During operation, the chip is mainly composed of auxiliary switch, half-bridge driver, two gate-drive transformers, temperature sensor, and self-protection circuity.

It has a good secondary side response during the dynamic switching load, where the chip can withstand up to 300V of the line voltage, plus the output voltage of 550V. This chip also has a built-on line of protection with a timer that will shut down the line when a short is detected. For AC input, the chip will ensure that the output voltage is well regulated at both high and low input voltage.

The working principle of the STR-W6556A is primarily based on its MOSFET structure. In order for it to work as an AC-DC and DC-DC converter, the MOSFET on the chip will convert the AC or DC electricity into an appropriate voltage. This can then be regulated by the voltage regulator built into the chip. During the switching process, the MOSFET acts as a switch that turns on or off, depending on the situation. The two gate drive control signals control the MOSFETs of the bridge circuit, which operates in a quasi resonant or a non-resonant (CCM) mode. During normal operations, the driving charge is controlled to limit the MOSFET output when operating in the CCM mode. The standby control circuit is enabled when there is no load on the chip, and it will turn the IC off automatically for safety and energy savings.

The many power management functions of the STR-W6556A make it an ideal device for AC and DC converters, and offline switchers. Its MOSFET structure will ensure that the AC or DC electricity is converted into an appropriate voltage for regulation by the voltage regulator built into the chip. It also ensures that the output voltage is well regulated even in low or high input voltage since it has an overload protection circuit, temperature protection and fault detection output. Thus, STR-W6556A is a great choice for high voltage AC and DC converters, and offline switchers.

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