INN2104K

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Power management (PMIC) integrated circuits are extremely important components found in most modern electrical and electronic devices where power is supplied from an external source to small and large systems. Without PMICs powering these circuits, many of the day-to-day activities that we take for granted would be impossible. PMIC - AC DC converters, offline switchers, and the INN2104K are all examples of PMIC components that ensure electricity is delivered to modern systems quickly, safely, and efficiently.

INN2104K Application Field and Working Principle

The INN2104K AC/DC switching regulator is an AC-input, high-efficiency, low voltage step-down regulator designed to deliver up to 800mA of output current. The low quiescent current, frequency foldback and operating temperature of -40°C to +125°C allow the INN2104K to provide a compact, low-noise, and efficient power solution for many industrial, telecom, and automotive applications. It is a member of the INNxxxxK high-efficiency family of AC/DC converters, which offer an extended temperature range, high efficiency, and Shutdown, Frequency Foldback and Over-current Protection (OVP) functions.

The INN2104K has two main application fields, namely as a single or dual-output regulator. As a single-output regulator, it provides up to 800mA of regulated output current and up to 1.2A of peak output current. As a dual-output regulator, it provides up to 800mA and 400mA of regulated output current and up to 1.2A and 600mA of peak output current. The output voltage can be adjusted from a low of 5V up to a maximum of 3.2V. The connection type of the INN2104K is a regulated DC power conversion element, and its work principle is to transform the input AC voltage into the required regulated DC voltage.

The INN2104K operates by first converting the input AC voltage into a DC voltage, which is then regulated to its output voltage. The INN2104K switches between the input voltage and a fixed internal reference voltage, which is determined by the external resistors and capacitors. This switching happens at a frequency of 1kHz to 1.2MHz and is managed by the internal oscillator, which is then regulated using a current-mode PWM or PFM control. The output voltage regulation is done using an internal feedback loop, which adjusts the duty cycle of the oscillator to achieve the desired output voltage. Additionally, the PWM/PFM switchover is controlled by the output voltage and load current, allowing for high efficiency at both light and heavy loads.

The INN2104K has several protection features to ensure that it operates properly and safely. These features include Thermal Shutdown (TSD), which disables the regulator if the junction temperature exceeds a preset maximum temperature, Over-voltage Protection (OVP), which turns off the regulator if the output voltage exceeds its set level, Under-voltage Lockout (UVLO), which turns off the regulator if the input voltage falls below the preset level, and Over-current Protection (OCP), which shuts off the regulator if the output current exceeds its set level.

In conclusion, the INN2104K is a high-efficiency AC/DC switching regulator designed to deliver up to 800mA of output current. It is a great choice for many industrial, telecom, and automotive applications due to its extended temperature range, high efficiency, and several protection features. Furthermore, its low quiescent current and operating temperature allow for a more compact power solution for many applications.

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