AP3105KTR-G1

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Power management integrated circuits (PMICs) are extremely important for the reliability and performance of most electronic devices nowadays. Since the advent of PMICs, many applications and designs have become simpler, since different voltage and power requirements can be fulfilled with one single device. The AP3105KTR-G1 is a proprietary PMIC from Diodes Incorporated and it is classified under the AC/DC converters, offline switchers product family.

The main application of the AP3105KTR-G1 is computer motherboard, display as well as industrial control and automation applications, as it can provide power supply and control functions in these applications without requiring much additional components. The package option of the device is a 4-pin Thin Fine-Pitch Ball-Grid Array (TFBGA) design which enables high-power density, fast switching, and small size. It provides the programmable over-current limit protection, frequency Fold-back feature, and several integration options such as LED constant current driver and diode emulation.

The AC/DC converters, offline switchers family from Diodes Incorporated supports an enhanced feature set that makes it flexible for use in a variety of applications. It exhibits an operating temperature range from -40°C to +125°C, and its peak current rating is up to 4A. It has a wide input voltage range of 3.0V to 42 V, and an adjustable output voltage range from 0.8V to 42V. With the help of an external step-down switching topology, the AP3105KTR-G1 can provide a continuous output current of up to 4A while consuming only low quiescent current at light loads.

The working principle of the AP3105KTR-G1 is based on Pulse Width Modulation (PWM) current mode control. This method is used to control the average output current of the load, while the load impedance is controlled using voltage regulation. The device utilizes an on-chip buck geberator which creates voltage pulses corresponding to the desired output voltage. This pulse width is determined by the error amplifier, which is connected to an external feedback resistor network.

The PWM control current mode is used to reduce ringing and thus reduce EMI generation. The feedback pin of the device is connected to the output capacitor, thus monitoring the output voltage. When the output is near the desired voltage, the error amplifier provides a low output voltage and the PWM pulse stops. When the output voltage drops below the target level, the error amplifier increases the output voltage and the PWM pulse continues. The device also has a safety protection feature, which protects the device from overvoltage, undervoltage and over-current conditions.

The AP3105KTR-G1 is an advanced PMIC that feature a sense amplifier integrated control and excellent efficiency, making it suitable for high-power applications. It features low standby current and low quiescent current, as well as a high output current. Hence, it is an ideal choice for applications requiring high power density and reliable performance.

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