78SR109HC

Voltage - Output 3:	--
Base Part Number:	78SR109
Size / Dimension:	0.94" L x 0.90" W x 0.31" H (23.9mm x 22.9mm x 7.9mm)
Package / Case:	3-SIP Module
Mounting Type:	Through Hole, Right Angle
Efficiency:	--
Operating Temperature:	-40°C ~ 85°C
Features:	OTP, SCP
Applications:	ITE (Commercial)
Current - Output (Max):	1.5A
Series:	78SR100
Voltage - Output 2:	--
Voltage - Output 1:	9V
Voltage - Input (Max):	30V
Voltage - Input (Min):	14.5V
Number of Outputs:	1
Type:	Non-Isolated PoL Module
Part Status:	Obsolete
Packaging:	Tray

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DC DC Converters

DC-DC converters are electronic circuits that convert a direct current input to a direct current output. The 78SR109HC is one such type of DC-DC converter, which typically takes a voltage input of 9V – 36V and produces an adjustable 8V – 28V output current with an output current of 700mA. It is widely used for various applications ranging from industrial, automotive and even consumer applications.

Design

The 78SR109HC is designed with a 5A Schottky diode for protection against reverse voltage and voltage transients. The device also includes an internal soft-start circuit that limits in-rush current and prevents voltage overshoots. It also features a remote on/off input control and output over-voltage protection. The design is also flexible, allowing users to customize their application requirements by changing the ratios between the input and output.

Application fields

The device is versatile and suitable for a wide range of applications such as automotive, industrial, consumer, and medical. It is suitable for applications requiring precise voltage adjustability and stable output power, such as power converters used in LED lights and displays, battery chargers, and low-power DC motor controllers. It is also well-suited for applications that require remote on/off control and over-voltage protection, such as point-of-sale (POS) systems and personal computer (PC) power supplies.

Working principle

The 78SR109HC is based on a buck-type switching regulator topology and operates using fixed frequency pulse width modulation (PWM). It utilizes two primary components, an inductor and a switch, to produce a steady output voltage and regulate current. The switch, either a MOSFET or bipolar transistor, is triggered by a PWM signal that pulses at a fixed frequency. This controls the inductor’s energy transfer, while the output voltage is regulated by the current passing through the inductor. The Inductor\'s current path comprises of four parts, namely: an input capacitor, an output capacitor, the switch, and the inductor\'s energy transfer path. The input capacitor acts as a reservoir to provide a consistent voltage supply, while the output capacitor removes fluctuations in the output voltage. The switch\'s PWM signal together with the inductor\'s current path controls the energy transfer, resulting in a steady output voltage. When the switch is opened, the magnetic field collapses in the inductor, producing an output voltage. When this happens, the current passes through the inductor is proportional to the output voltage. By doing this, the output voltage is regulated and kept constant.

Conclusion

The 78SR109HC is a versatile and efficient DC-DC converter that is suitable for numerous applications due to its flexible design and precise voltage adjustability. It is a buck-type switching regulator that utilizes a fixed frequency PWM signal to control the energy transfer of an inductor, which results in a steady output voltage. It is also designed with protection features such as an internal soft-start circuit, remote on/off control and output over-voltage protection. The 78SR109HC offers a reliable, cost-effective solution for applications that require precise voltage adjustability and stable output power.

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