IL4824S

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DC–DC converters are essential components of many electronic devices. They convert a direct current (DC) input voltage to a higher or lower DC output voltage. A wide range of DC–DC converters are available for different applications. Among these are the isolated DC–DC converters, which are also known as DC–DC transformer. The IL4824S is an isolated, wide input range, step-down DC–DC converter which provides high efficiency with up to 98.5%. It is suitable for telecommunications, industrial, automotive and consumer applications.

The IL4824S is a PWM control, fixed frequency, step-down converter that integrates a wide input voltage range of 2.9 V to 28 V. Its 2.5 to 72 VDC output voltage range, combined with the up to 3 A peak output current make it perfect for a wide range of applications. In addition, the device features a quiescent current of 15mA, making it ideal for battery-operated applications. The IL4824S also features pulse width modulation (PWM) control for improved efficiency over the entire output current load.

The IL4824S has a fixed frequency current-mode control, which helps to achieve excellent line and load regulation. The device also has a shutdown mode, which allows the device to remain in standby mode and reduce the quiescent current for extended battery life when no output is required. It has an external compensation network, making it easy to optimize the control loop for improved transient response. The converter also features over-voltage and over-temperature protection and external synchronization to prevent both EMI and sub-harmonic oscillations.

The IL4824S adopts the primary side MOSFET controller to control the switching of the synchronous rectifier MOSFET and the synchronous rectifier diode. The primary side controller uses a high-side FET to control the transformer winding current, and both the mid-point and high-side FETs are actively turned on in the minimum duty cycle. As a result, the converter achieves a relatively low output voltage ripple, high power efficiency, low switching frequency (300kHz to 1MHz), and small size.

The IL4824S can be used in isolated applications, such as AC–DC power supplies, point-of-load power supplies, telecom systems, and industrial and automotive systems. It is also suitable for powering peripherals, such as microprocessor cores and memory circuits. The device is compatible with widely used power converters, such as the ST\'s family of PIC® devices, making it easy to integrate into a variety of applications.

The working principle of the IL4824S is relatively simple. It takes an AC voltage input, usually from a power supply, which is then rectified and then filtered by an inductor/capacitor filter. The filtered signal is then fed to the primary side controller, which turns on and off the controlling MOSFETs. The MOSFETs control the current flowing through the transformer windings and the secondary side rectifier diodes. The current then flows through the rectified voltage and is then regulated to the usable DC voltage.

The IL4824S is an efficient and powerful DC–DC converter that provides a wide range of input and output voltage, making it suitable for a variety of applications. Its pulse width modulation, over-voltage, and over-temperature protection features make it highly reliable even in harsh environments. With its simple working principle and wide range of features, the IL4824S is an ideal choice for a variety of applications in the consumer, automotive, industrial, and telecommunications fields.

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