UCC38C42PG4

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UCC38C42PG4 is an advanced high-voltage, low-power, bipolar integrated power switching circuit. It is primarily designed for use in Off-Line converters, can also be used in AC to DC converters. It has been designed to provide the power control and protection needed in applications ranging from general purpose AC to DC converters to high-end home appliances and portable equipment.

The UCC38C42PG4 has high performance characteristics with minimal external components requirement. It provides an output current mode oscillator, voltage regulator, and fault protection. The oscillator frequency is adjustable with an external resistor. The frequency can be adjusted to maximize efficiency or reduce power dissipation. The output current regulation is fixed at 80mV. The open loop voltage gain is adjustable with an external resistor. The UCC38C42PG4 also features a completely integrated fault protection circuit to protect agains short circuit and over-temperature operation.

The basic power converter topology used by the UCC38C42PG4 is a flyback converter, which can generate voltages up to about 200V. The main components of the circuit are the switching transistor, primary transformer, rectifier diode, clamp diode and the output capacitor. The switching transistor is used to turn on and off the primary winding of the transformer when a control signal is applied. The primary transformer couples energy to the secondary winding, where it is rectified by the rectifier diode and stored in the output capacitor.

In order to regulate the output voltage, the UCC38C42PG4 uses a current-mode feedback control loop. This loop is made up of current sensing elements, voltage detectors, and feedback controllers. The current sensing elements measure the current in the primary winding, which is proportional to the load current. The voltage detectors detect the output voltage and feed the feedback signal back to the control circuitry. The feedback controller then adjusts the control signal applied to the switching transistor to maintain the output voltage at a predetermined level.

To protect the output from excessive current and temperature, the UCC38C42PG4 has built-in fault protection. It will detect an overcurrent signal and will shut off the primary winding. It will also detect an over-temperature signal and will shut off the primary winding. Additionally, a built-in power consumption limit is included to ensure that the primary winding doesn\'t draw more than a certain amount of power. This will help protect the circuit from drawing too much power and damaging the components.

Overall, the UCC38C42PG4 is an innovative high-voltage, low-power, integrated power switching circuit. It provides cost effective and efficient power control for off-line and AC to DC switching regulators. Its integrated fault protection and adjustable frequency make it attractive for a variety of AC to DC applications.

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