PT78ST109ST

Voltage - Output 3:	--
Base Part Number:	PT78ST109
Size / Dimension:	0.94" L x 0.90" W x 0.34" H (23.9mm x 22.9mm x 8.6mm)
Package / Case:	3-SMD Module
Mounting Type:	Surface Mount
Efficiency:	85%
Operating Temperature:	-40°C ~ 85°C
Features:	OTP, SCP
Applications:	ITE (Commercial)
Current - Output (Max):	1.5A
Series:	PT78ST100
Voltage - Output 2:	--
Voltage - Output 1:	9V
Voltage - Input (Max):	38V
Voltage - Input (Min):	13V
Number of Outputs:	1
Type:	Non-Isolated PoL Module
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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DC-DC Converters

DC-DC converters are a type of power conversion devices, which are renowned for their ability to take a DC input voltage and efficiently convert it into a separate DC voltage. The power input can come from a variety of sources, such as batteries, solar panels, or AC sources. Primarily, DC-DC converters are used as a form of voltage regulation or signal isolation.One of the more popular DC-DC converters is the PT78ST109ST. This particular device is a monolithic, double-ended flyback converter with an integrated MOSFET, which offers up to 3W of output power. This makes it an ideal choice for applications that require a low-cost, low-power, and reliable DC-DC solution, such as household and industrial electronics.

PT78ST109ST Application Field

The PT78ST109ST is an ideal choice for a variety of applications, due to its low-power, cost-efficient, and reliable operation. It is capable of efficiently converting an input voltage in a range of 4.5V to 14V to a fixed output voltage of 5V or 3.3V, depending on the application. It can operate over a wide range of temperatures, typically from -40C to 85C, and is available in a compact and space-saving small package size, ideal for applications where board space is a constraint.In addition, the PT78ST109ST has short circuit protection features, such as internal over-temperature protection, and an optimal thermal design, providing a high efficiency and robust performance for almost any application. The flyback converter is also highly reliable, with a long lifetime of up to 100,000h, making it an ideal choice for most consumer and industrial applications.

PT78ST109ST Working Principle

The PT78ST109ST is a monolithic flyback converter, which utilises a power MOSFET to switch the input voltage in order to generate the output voltage. The switching action of the MOSFET is driven by a high frequency oscillator, and is coupled with an adjustable hysteretic current-limit control for efficient and reliable operation. When the flyback transformer is energised, it induces a voltage onto the output winding, resulting in a DC voltage being generated at the output. The output voltage is regulated by a voltage feedback loop via an error amplifier, which then adjusts the duty cycle of the MOSFET, and therefore the output voltage, in order to maintain the correct output voltage.The PT78ST109ST also features an integrated switching frequency jitter circuit, which modulates the switching frequency in order to reduce the EMI (electro-magnetic interference) associated with any rapid changes in the load, or ripple voltage. This feature results in the device having low EMI emissions, making it an optimal choice for sensitive applications which are subject to FCC or CE regulations.

Conclusion

The PT78ST109ST DC-DC converter is an excellent low-power solution for a variety of applications, offering up to 3W of output power with exceptional efficiency and reliable operation, even in adverse conditions. Utilising a monolithic flyback design, and integrated short circuit protection, this converter is highly versatile and reliable, making it an ideal choice for a wide range of consumer and industrial applications.

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