DC519A

Series:	--
Part Status:	Active
Main Purpose:	DC/DC, Step Down
Outputs and Type:	4, Non-Isolated
Voltage - Output:	1.8V, 3.3V, 3.3V, 5V
Current - Output:	1.4A, 1.4A, 1A, 1A
Voltage - Input:	4.8 V ~ 14 V, 6.8 V ~ 25 V
Regulator Topology:	Buck
Frequency - Switching:	1.1MHz
Board Type:	Fully Populated
Supplied Contents:	Board(s)
Utilized IC / Part:	LT1940
Base Part Number:	LT1940

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<p>DC519A is a full-range, low-power, high-efficiency, and all-directional power management and conversion solution. This off-line SMPS evaluation board is designed to help with the development of ultra-low-power/loss applications, such as DC-DC and AC-DC switch-mode power supplies, Li-ion battery chargers, AC adapters, UPS, high power LED driver, and car chargers. With an integrated soft-start and constant current control feature, the board is specially designed to meet various applications requirements.<p><p>DC519A provides up to 400mA of output current and adjustable output voltage from 0.7 to 14 V. It also has a built-in buck/boost circuit with short circuit, overvoltage, and overcurrent protection feature. It also offers a variety of cost-effective solutions by utilizing a wide range of AC input sources including: 110VAC, 230VAC, 250VAC or 12VDC as well as Li-ion, NiMH or NiCd, AAA, AA and CR123 batteries. Its ultra-low quiescent current consumption makes it ideal for extended battery life applications as well.<p><p>DC519A features a synchronous MOSFET modification which allows for higher efficiency and frequency operation. This can help to reduce the size and cost of the system, which is often the most difficult part of the power supply design. Additionally, the board is designed with a preset output voltage so that the output voltage is adjustable between 0.7 to 14 V. It also allows for either a buck or boost configuration under the same voltage range. All of these features make it a great choice for any application in search of a reliable, efficient and cost-effective power management and conversion solution.<p><p>The working principle of the DC519A is based on a synchronous step-down (buck) conversion process. The board is powered by an external DC voltage source which is regulated by a voltage divider connected to the board. The voltage is then rectified by a full-wave rectifier and fed to the primary side of the DC-DC converter. The output of the converter is then regulated by the feedback signal provided by an external DC voltage detector. This feedback signal is compared with a preset voltage and used to adjust the duty cycle of the MOSFETs.The output of the synchronous MOSFETs is then fed to the diode bridge rectifier which converts the voltage to provide the output current for the load. The output current is monitored by the current detector connected between the output current and ground. If the detected current is larger than the preset current, a current limit protection is activated. If the detected current is lower than the preset current, an over current guard is activated. <p><p>DC519A is designed to be extremely efficient and reliable for applications that require a low-power, low-cost, and all-directional power supply solution. Its integrated soft-start and constant current control feature enables it to meet a variety of system requirements while providing excellent protection against overvoltage, overcurrent, and short-circuit conditions. With its high-efficiency and allowing for higher frequency operations, the DC519A solution provides a convenient and cost-effective solution for applications in need of reliable power conversion and management.<p>

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