78ST305VC

Voltage - Output 3:	--
Base Part Number:	78ST305
Size / Dimension:	1.01" L x 0.38" W x 0.98" H (25.7mm x 9.7mm x 24.9mm)
Package / Case:	3-SIP Module
Mounting Type:	Through Hole
Efficiency:	80%
Operating Temperature:	-40°C ~ 70°C
Features:	OTP, SCP
Applications:	ITE (Commercial)
Current - Output (Max):	3A
Series:	78ST300
Voltage - Output 2:	--
Voltage - Output 1:	5V
Voltage - Input (Max):	20V
Voltage - Input (Min):	8V
Number of Outputs:	1
Type:	Non-Isolated PoL Module
Part Status:	Obsolete
Packaging:	Tray

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Introduction to DC DC Converters

A DC-DC converter is an electrical circuit that converts direct current (DC) from one voltage level to another. Generally speaking these converters operate between two sources providing either step up (increase in voltage) or step down (decrease in voltage) capabilities. These converter circuits can be an integral part of a variety of applications for many industries including computer and handheld gadgets, energy storage systems, medical and military applications, aerospace, telecoms, renewable energy and automotive just to name a few.DC-DC converters come in many different forms each designed to specialize in specific applications. These can range from boosting or bucking a voltage from a few milliamps up to hundreds of amps, switching up to several kilowatts, or even operating closed loop servo amplitude and frequency lock operations. In this article we will look at the 78ST305VC model which is a smart step-up converter and specialize focusing in how it works and its application field.

The 78ST305VC Model

The 78ST305VC is a highly efficient step-up converter from Texas Instruments that can be integrated into a wide range of applications, from lighting to Wi-Fi routers. The 78ST305VC is capable of providing a regulated output voltage of up to 5.2V when driven by an input voltage as low as 0.6V making it ideal for portable systems that require a small form factor and low power consumption. The 78ST305VC integrates two switches, driven in a continuous-conduction-mode synchronous rectification topology, and a few peripheral components such as the Schottky diode, an inductor, and two capacitors.

78ST305VC Working Principle

The core of the 78ST305VC is a synchronous rectifier switching topology consisting of two synchronized switches, namely an N-channel MOSFET and P-channel MOSFET. The two switches employ a high side switch (N-channel MOSFET) connected to the input and a low side switch (P-channel MOSFET) connected to the output. The input and output voltage difference is regulated by driving the switches in Turn-On and Turn-Off sequences.The schematic of the 78ST305VC is shown below where the N-channel and P-channel MOSFETs are represented by N and P, respectively. An inductor and two capacitors are employed to filter the input voltage. The control circuitry is integrated and designed to monitor the output voltage and drive the N- and P-channel source terminals to provide voltage regulation.

Application Field

The 78ST305VC provides an ideal solution for many cost-sensitive and limited space applications such as digital TVs, DVD players, game consoles, set-top boxes, routers, household appliances, and LED lighting. It can supply up to a 5.2V output voltage when driven from a 0.6V input voltage thereby allowing designers to minimize the size of the power supply systems.The 78ST305VC is also an ideal choice for applications where the input voltage varies such as in automotive or battery applications as it can be designed to automatically adjust its output voltage to match the desired level. This makes it ideal for applications such as automotive lighting, such as headlights, brake lights, fog lights, and interior car lights. Additionally, the 78ST305VC can also be used to design a battery-powered battery charger.

Conclusion

The 78ST305VC is a highly efficient and compact smart step-up converter from Texas Instruments that is suitable for a variety of applications. It can provide a regulated output voltage range of up to 5.2V when driven from a 0.6V input voltage, making it suitable for portable devices and applications where the input voltage varies, such as in automotive and battery applications. Its high efficiency and small form factor make it an ideal choice for both industrial and consumer applications.

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