UC3573NG4

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The UC3573NG4 is a high-voltage switching controller purpose-built for a variety of power management applications. It is a highly efficient, monolithic MOSFET driver ideally suited for a wide range of switched-mode power supply (SMPS) topologies, such as flyback, forward, and buck-boost converters.

As part of a family of pin-compatible dual-channel controllers, the UC3573NG4 is a versatile solution providing a wide input voltage range from 8 V to 38 V, an operating temperature range from -25 °C to +125 °C, and an adjustable output current limit up to about 1.6 A. The UC3573NG4 is a great choice for many applications such as DC/DC synchronous Buck converters, automotive and industrial systems, consumer, computer and telecom equipment.

Working Principle: The UC3573NG4 works as a power conversion ratio of input voltage to output voltage (V/V) controller. It regulates the output voltage either through voltage feedback or current sense (V/I controlled mode) depending on the specific application. It is a linear controller with error amplifier, overvoltage protection, over-temperature protection, and current limiting, etc. The internal current sense voltage can be shared as an output voltage signal to the general-purpose input/output (GPIO) pin.

When the operating voltage of the power supply is within the safe range, the UC3573NG4 works to maintain output voltage by regulating the duty cycle of the primary switch. It is suitable for most switching converters, providing accurate and stable output voltage, as well as low noise operation. The UC3573NG4 also provides a low ripple current output, and is capable of operating with various output switches, including MOSFETs, IGBTs, Thyristors and power Darlington transistors.

The UC3573NG4’s integrated protection and self-driving capability make it an excellent choice for system protection and simplification. It is equipped with a potentiometer-adjustable overvoltage shut-off protection circuit; an adjustable soft start circuit; and self-current limiting protection. It also has an adjustable output current limit to protect the output circuit from short-circuiting.

In industrial and automotive applications, the UC3573NG4 supports a variety of functions including line voltage brown-out protection, soft start, and peak current mode control like Peak Current Mode control (PCMC). It is suitable for maximum switch frequency up to 500 KHz and is guaranteed to work under the most demanding surge and noise environment in the application.

The UC3573NG4 is an ideal solution for power management applications, providing an integrated and reliable circuit design. It is an excellent choice for high-voltage converters, pre-regulators and adapters as well as a wide range of portable and stationary power systems.

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