UC1845AY

Series:	Military, MIL-STD-883B
Part Status:	Active
Output Type:	Transistor Driver
Function:	Step-Up, Step-Down
Output Configuration:	Positive
Topology:	Buck, Boost
Number of Outputs:	1
Output Phases:	1
Voltage - Supply (Vcc/Vdd):	7.6 V ~ 30 V
Frequency - Switching:	500kHz
Duty Cycle (Max):	96%
Synchronous Rectifier:	Yes
Clock Sync:	No
Serial Interfaces:	--
Control Features:	--
Operating Temperature:	-55°C ~ 125°C (TA)

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UC1845AY Application Field and Working Principle

DC-DC switching controllers are voltage regulators used to convert direct current (DC) electricity from one voltage level to another, often with the need to provide a higher or lower current. This article discusses the application field and working principle of UC1845AY DC-DC switching controllers.The UC1845AY is a conduction mode DC-DC controller IC which uses a compare-and-flip control principle to generate optimized output voltage control. It has two operating modes with two different output voltage ranges. The Mode 1 minimum to maximum output voltage range is 0.7V to 16V, while the Mode 2 minimum to maximum output voltage range is 1.75V to 34V. This makes the UC1845AY suitable for a wide range of applications, including low voltage power supplies, DC-DC converters, LED drivers, 5V regulator, lighting, motor control, battery charging, and power converters. Moreover, the device features an overvoltage protection (OVP) circuit, making it suitable for applications such as telecom and industrial power supplies.The UC1845AY is available in a 8-pin PDIP, SOIC, and SSOP package. It is powered by a single 5V power supply and also has an input voltage range of 3.2V to 40V. The output voltage can be adjusted through a single external resistor, making design and implementation easier. The device also includes a peak current limit and thermal shutdown protection, further enhancing the device’s overall protection capabilities. When it comes to operation, the UC1845AY is designed around a microprocessor-controlled oscillator (MCO), which sets the frequency and pulse width of the output voltage of the device. The sloped output voltage of the device is controlled by a voltage feedback loop. The loop consists of a reference voltage and an external resistor, which set the output voltage. The UC1845AY also has a built-in error-amplifier, a PWM comparator, and several other components.When the device is powered on, it begins to operate in MCO mode. This mode causes the MCO to compare the sample voltage and the reference voltage, and it changes its output depending on the results of that comparison. In Mode 1, the MCO is programmed to produce an output voltage in the range of 0.7V to 16V, while in Mode 2, the output voltage range is from 1.75V to 34V. The UC1845AY also includes a peak current limit pin and a thermal shutdown pin, which provide additional protection. The peak current limit pin ensures that the output current of the device won’t exceed a pre-defined level. Similarly, the thermal shutdown pin monitors the device temperature and prevents it from overheating.Overall, the UC1845AY DC-DC switching controller is a reliable and efficient device. It is widely used in a variety of applications such as power supplies, LED drivers, 5V regulators, and motor controls. With its low pin count, adjustable output voltage, peak current limit, and thermal protection features, it is an ideal device for projects with tight space requirements.

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