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5- A Constant Current Buck Regulator for Driving High Power LEDs 1 FEATURES 3 DESCRIPTION The LM3406 family are monolithic switching 1• LM3406HV- Q1 regulators designed todeliver constant currents – Automotive Grade Device high power LEDs. The simplest constant- current source or sink is formed from one component: a JFET with its gate attached to its source.
Constant current regulator ic. Once the drain- source voltage reaches a certain minimum value, the JFET enters saturation where current is approximately constant.
" LM117/ LM317A/ LM317- N 3- Terminal Adjustable Regulator" Ideal for automotive – AEC- Q100 Grade 1 Qualified general lighting applications, industrial they contain a high- side – Operating. ON Semi' s constant current regulators are based on self- biased transistor technology and regulate current over a wide range of voltages. Constant current sources can be designed using a number of standard analog building blocks including op amps, LED drivers battery chargers.
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5 A Constant Current Switching Regulator for LEDs The NCP3065 is a monolithic switching regulator designed to deliver constant current for powering high brightness LEDs. The device has a very low feedback voltage of 235 mV ( nominal) which is used to regulate the average current of the LED string.
In addition, the NCP3065 has a wide input voltage up to 40 V to allow it to operate cause the voltage between a linear regulator' s output and ground is tightly regulated, a fixed resistor connected between those two nodes produces a constant current between the output and ground. This configuration applies to both high- side and low- side current sources.
LM317 / LM338 / LM350 Current Regulator Circuits. The following circuits show some of the basic uses of the LM317 / LM338 / LM350 series of voltage regulators when configured as a current regulator or constant current source ( CCS).
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The adjustable constant current regulator ( CCR) is a simple, economical and robust device designed to provide a cost effective solution for regulating current in LEDs. While designed as a variable voltage regulator, it will double as a stable constant current source. With only three pins as shown above, one can produce a current of about 1- amp max. See With only three pins as shown above, one can produce a current of about 1- amp max. Analog Devices’ portfolio of dedicated constant current source products offer ease of use and design; voltage, current, and thermal protection; and built- in current limiting.