PT4147A Power Supplies - Board Mount

Current - Output (Max):	5A
Base Part Number:	PT4147
Size / Dimension:	1.67" L x 1.48" W x 0.33" H (42.4mm x 37.6mm x 8.4mm)
Package / Case:	6-DIP Module
Mounting Type:	Through Hole
Efficiency:	67%
Operating Temperature:	-40°C ~ 85°C
Features:	--
Applications:	ITE (Commercial)
Voltage - Isolation:	1.5kV
Power (Watts):	20W
Series:	PT4140
Voltage - Output 3:	--
Voltage - Output 2:	--
Voltage - Output 1:	1.8V
Voltage - Input (Max):	40V
Voltage - Input (Min):	18V
Number of Outputs:	1
Type:	Isolated Module
Part Status:	Obsolete
Packaging:	Tray

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DC-DC Converters: PT4147A Application Field and Working Principle

DC-DC converters are electronic devices widely used in many industries due to their ability to convert a direct current from one voltage level to another. This conversion is made possible by the use of a power electronic circuit which essentially utilizes a semiconductor-switching device to regulate the DC power level or voltage. The PT4147A is a type of DC-DC converter widely used in the production of low-power electronic devices. It is manufactured by Power Integrations, a leading supplier of electronic power conversion systems.

Application Field of PT4147A

The PT4147A is a low-cost DC-DC converter suitable for powering low-input voltage systems, such as 5V and 3.3V. It offers the user the ability to both step-down and step-up the DC level, allowing for a range of input voltages from 2.8V to 5.5V. This makes the PT4147A suitable for a variety of applications, including portable electronic devices, medical devices, embedded systems, and consumer electronics.In addition, the PT4147A is a reliable and cost-effective solution for applications that require higher efficiency and power density. The device is efficient up to 95%, making it an ideal choice for high-frequency, high-efficiency applications such as laptop computers and other portable electronic devices. Furthermore, the compact surface-mount package offers a great amount of power in a small form factor, making it a suitable solution for space-constrained applications.

Working Principle of PT4147A

The PT4147A DC-DC converter utilizes a two-transistor, boost-flyback topology, which is a form of an AC-DC converter. The two transistors are a buck-boost switch, which is used to step-up and step-down DC level, and an inductor, which stores energy during the output transition. In a typical operating cycle, the buck-boost switch, transistor Q1, is turned on, allowing the DC voltage to increase and store energy in the inductor. Once the voltage has reached the required level, Q1 is turned off, and the inductor collapses to return energy to the output. At the same time, the flyback switch, transistor Q2, is turned on to clamp the output voltage at the required level. The PT4147A also features internal current-limiting and thermal-protection circuits. This further improves the device’s safety and reliability, ensuring a highly reliable power supply for the intended application.

Conclusion

The PT4147A is a low-cost DC-DC converter ideal for powering low-input voltage systems with high efficiency and power density. The device features a two-transistor, boost-flyback topology for DC-level stepping, while also offering internal current-limiting and thermal protection circuits for improved safety and reliability. This makes it an ideal choice for a variety of applications, such as portable electronic devices, embedded systems, and medical devices.

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