JAN1N5621

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JAN1N5621 is a low cost, two-stage, high-efficiency step-down switching regulator designed with a wide range of applications in mind. It uses a switching control circuit to generate a pulse width modulated (PWM) signal to drive a synchronous rectified gate driver for low power loss. Converter efficiency can be as high as 95%. The switching frequency is adjustable from 100kHz to 1MHz, allowing for fast transient response and a low noise output. The device also features a programmable current limit and thermal shutdown protection to ensure reliable operation.

JAN1N5621 has a wide range of application fields such as automotive electronics, communication and consumer electronics, LED lighting, LCD TV, industrial power supplies etc. The device integrates high-side and low-side MOSFETs with up to 2.2A maximum output current, making it well suited for power supplies where the maximum power consumption is not higher than 20W. The device is also capable of operating at wide input supply range, as low as no-load input voltage of 3V, which is beneficial for applications where the input supply voltage is unstable.

The working principle of the JAN1N5621 switching regulator is based on the Buck switching regulator topology. The device is designed to accept a wide range of input voltage from a wide range of sources, such as, rectified AC line voltage, unregulated DC power supply, or a battery. When the input voltage is above the desired output voltage, it starts to regulate the output voltage by turning the MOSFET driver on and off at high speed. The frequency of the switching is adjustable in the range of 100kHz to 1MHz. With this high-frequency switching, the output voltage is maintained constant, even if the input voltage varies slightly. The output voltage is determined by the ratio of the inductance, the switching frequency and the output current.

The current limit of the JAN1N5621 device is enabled by another feedback control loop, which senses the output current and keeps it precisely within the programmed limits by temporarily disabling the switching of the internal MOSFETs. The feedback loop senses the current with a sense resistor connected from the output of the regulator to the ground, and limits the current to a level below its programmed value. This feature is important in applications where the load current is large, and generally helps in protecting other components in the circuit.

The JAN1N5621 switching regulator also provides a thermal overload protection for the device. When the operating temperature of the device rises above a certain threshold, the thermal protection circuit automatically shuts the device off. This helps in protecting the device from excessive temperatures, which can damage the device or reduce its lifetime.

In summary, the JAN1N5621 regulator is a versatile, low-cost, two-stage, high-efficiency switching regulator with wide range of application possibilities and features. It provides high output voltage accuracy and fast transient response. The device also features current limit and thermal protection, making it robust and reliable.

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