DPA425P

Series:	DPA-Switch®
Packaging:	Tube
Part Status:	Obsolete
Applications:	Converter, Power Over Ethernet and Telecom Applications
Voltage - Input:	16 V ~ 75 V
Number of Outputs:	1
Voltage - Output:	220V
Operating Temperature:	-40°C ~ 125°C
Mounting Type:	Through Hole
Package / Case:	8-DIP (0.300", 7.62mm)
Supplier Device Package:	8-DIP

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PMIC – Voltage Regulators – Special Purpose: DPA425P Application Field and Working Principle

The DPA425P, or Direct Path Primary Side Regulator, is the first of its kind to be released by the semiconductor company Texas Instruments. The device is intended to provide power-supply solutions with very high efficiency and flexibility suitable for dynamic loading conditions. The main application fields of the device are power supplies for operational environments involving AC-DC (alternating current to direct current) conversion, and for automotive and high-power LED lighting applications where precise control and fast load/response dynamics are necessary.This PMIC device is designed using TI’s Direct Path technology, a patented system that provides an efficient and precise control of output power over a wide range of load and input power levels without the need of an extra power converter module or transformer. By using relative information about its load conditions, the DPA425P can regulate its output voltage in real time. It is designed to replace either a transformer and rectifier bridge circuit or a constant-switch-mode power IC.In addition to its power efficiency feature, the device also has protection subsystems on its inputs and outputs, over-voltage protection, extended current sensing accuracy and temperature protection. There is also an overload protection mode. All these features guarantee the user maximum control and protection of complex applications.In terms of its working principle, the device employs a modulator operating in an analog domain to compare the output voltage with a reference signal and to adjust its pulse width modulation as needed. This PWM signal is then used to drive an integrated power MOSFET. The PWM signal is modulated in such a way that it can can accurately regulate the output power, thereby allowing the outputs to be powered with the correct voltage.To further ensure tight control of the output voltage and keep it within limits, the DPA425P also employs a programmable peak current limit, line compensation and programmable soft start. The device also utilizes peak current mode control, which is a technique used to provide precise control and fast response to dynamic loading conditions.Overall, the DPA425P is an innovative and powerful device that promises to revolutionize power supply solutions for complex applications and environments where precise control, fast load/response dynamics and high efficiency are of utmost importance. For these applications, the device is indeed a valuable addition to the family of special purpose voltage regulators.

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