SG3524P

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SG3524P is a current-mode pulse-width modulation (PWM) control circuit, developed by Texas Instruments. It is commonly used in voltage regulator circuits, especially in switch mode converters. This integrated circuit is used in many applications that require a steady output voltage, or a fast output response despite changes in input voltage or load. SG3524P has 18 pins, with various packages and a wide range of input voltage of is 4.4V to 40V. This article will discuss its application field and working principle.

Application Field of SG3524P
SG3524P is most commonly used in switch mode power supplies, but can also be used in some non-isolated applications such as motor control and other DC-to-DC converters and regulators. It is an ideal solution for on-card power supply design, allowing precision voltage, current and temperature control. Some of the applications of SG3524P are as follows:

• DC-DC Buck and Boost Regulators
• Low-Dropout Regulators
• High-Threshold Switching Regulators
• Computer Power Supplies
• Hard-Drive Power Supplies
• Halogen Lamp Ballast Control
• Telecommunications Switches
• Servo Motor Drives
• Battery Chargers

Working Principle of SG3524P
The SG3524P is a current-mode PWM controller. It produces output voltage by comparing the external current reference to the feedback signal. This is done by switching the power device on or off. The input voltage is always higher than the output voltage (during the on time of the PWM cycle) but the control circuit is designed to provide constant current to the load. The output voltage is therefore kept constant regardless of input voltage or load.

SG3524P has two main logic signals which control the pulse width modulation (PWM) cycle, a PWM_OUT signal and a PWM_IN signal. The PWM_OUT signal is generated by an internal oscillator, which provides the basic timing for the PWM cycle. The PWM_IN signal is then used to control the ON-time duration of the PWM cycle, based on the internal current reference.

The PWM_OUT signal is a square wave signal which is used to switch the power device on and off. When it is switched on, the power device is driven with current to drive the output voltage. The PWM_IN signal will turn the power device on for a certain amount of time, depending on the current reference. The current reference is generated by an internal resistive network and can be adjusted by an external resistor.

The SG3524P is also protected against short circuit conditions thanks to its short circuit protection functions, peak current limit, average current limit and thermal shutdown functions. This integrated circuit can also be configured in a synchronous switching mode which provides a constant frequency over the entire input voltage and load range.

Conclusion
SG3524P is an integrated PWM controller developed by Texas Instruments. It is used in many applications that require a steady output voltage, or a fast output response despite changes in input voltage or load. It is suitable for DC-DC Buck and Boost Regulators, Low-Dropout Regulators, High-Threshold Switching Regulators, Computer Power Supplies and other applications. The PWM controller works by comparing a current reference to a feedback signal in order to generate an output voltage. It also has various protection functions.

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