LT1576IS8-5#PBF

Voltage - Output (Min/Fixed):	5V
Base Part Number:	LT1576
Supplier Device Package:	8-SOIC
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C (TJ)
Synchronous Rectifier:	No
Frequency - Switching:	200kHz
Current - Output:	1.5A
Voltage - Output (Max):	--
Series:	--
Voltage - Input (Max):	25V
Voltage - Input (Min):	5V
Number of Outputs:	1
Output Type:	Fixed
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Active
Packaging:	Tube

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IntroductionLT1576IS8-5#PBF is a type of DC/DC switching regulator that is specifically designed for a wide range of industrial and automotive applications. It is classified as PMIC – Voltage Regulators – DC DC Switching Regulators, as it serves to control the output voltage and current of a circuit for a smooth and reliable operation. This article aims to educate readers about the LT1576IS8-5#PBF application field and its working principle, so that it can be better utilized for achieving various tasks.Application FieldThe LT1576IS8-5#PBF is a popular model of adjustable switching regulator that is rated for an operation range from -25°C to +125°C. It has a maximum output current rating of 5A and can deliver a precise voltage output with a frequency range of 500KHz to 1.5MHz. Due to its wide operational range, the LT1576IS8-5#PBF can be applied in various industrial and automotive applications. It is ideal for powering up industrial controls and drives, as it enables precise control of the output voltage and current through on-board circuits with hardly any perturbations. It can also be used efficiently in automotive systems, such as air conditioning systems, charging systems and ignition systems, where a safe and stable output is needed during start-ups and shut-downs.Working PrincipleThe LT1576IS8-5#PBF features a high efficiency synchronous switching architecture, which essentially boosts the efficiency of the regulator circuit and improves the output performance. Said regulator operates as a buck converter, where the transformer’s primary side is controlled to regulate the voltage output. The circuit contains two main sections, which are the controller and the power section.The controller section consists of an input capacitor, a voltage regulator, a PWM comparator, a drive stage and the logic related elements. The power section consists of a power transistor, an inductor and a diode. The core of the LT1576IS8-5#PBF is the switching power transistor, which uses a PWM control signal to achieve the desired voltage output. The PWM control signal is generated when the comparator receives a reference voltage at its input, comparing it to a 2nd voltage from a bandgap circuit. As the comparator signals a high or a low level, the power transistor will switch accordingly, modulating the output of the circuit.ConclusionThe LT1576IS8-5#PBF is a type of DC/DC switching regulator that is suitable for a wide range of applications, particularly in industrial and automotive applications. Its high efficiency synchronous switching architecture boosts the efficiency of the regulator circuit and allows the steady delivery of the required output voltage. Its high operational range of -25°C to +125°C and adjustable output current with a maximum rating of 5A makes it an ideal choice for a variety of use cases. Ultimately, the working principle of the LT1576IS8-5#PBF can be summarized as: A PWM control signal is generated when an input reference voltage is compared to a 2nd voltage from a bandgap circuit. The switching power transistor then uses the PWM signal to modulate the output of the circuit.

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