SG1843Y-DESC

Voltage - Supply (Vcc/Vdd):	7.6 V ~ 30 V
Supplier Device Package:	8-CDIP
Package / Case:	8-CDIP (0.300", 7.62mm)
Operating Temperature:	-55°C ~ 125°C (TA)
Control Features:	--
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	No
Duty Cycle (Max):	95%
Frequency - Switching:	1Hz ~ 500kHz
Series:	Military, MIL-STD-883B
Output Phases:	1
Number of Outputs:	1
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tube

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SG1843Y-DESC Application Field and Working Principle PMIC - Voltage Regulators - DC DC Switching Controllers are essential for the functioning of many everyday electronic appliances, from laptops to smartphones and from digital cameras to game consoles. The SG1843Y-DESC is a monolithic integrated circuit (IC) which controls the output voltage and current of an isolated DC-DC converter. This IC reduces the development costs and time of the design, and is designed to meet the requirements of electronic equipment security, performance, convection cooling, and size reduction.The SG1843Y-DESC is mainly used in industrial control and other applications with High-power LED lighting, automotive automotive rear combination light, consumer electronics, mobile power, and TV power supply. It is a pseudo-constant frequency single-ended conduction mode flyback converter with frequency modulation and voltage division with a switching frequency of 45kHz. It features a low-power standby mode and undervoltage lockout, as well as protection against overcurrent, overvoltage, overtemperature, and over-voltage protection. The device can be used for either constant voltage or constant current applications, and includes a current limit adjustment circuit.The main working principle of SG1843Y-DESC is based on a pulse width modulation (PWM) control circuit. The error amplifier inside provides high accuracy in voltage regulation. It also uses frequency modulation to reduce the audible noise of the converter. It has high integration, low total resistance of its output capacitor, and a single current setting mode to make it compact in size.The SG1843Y-DESC has a built-in high-frequency power MOSFET for the switch, an operational amplifier for comparing the feedback voltage, two voltage references, an undervoltage lock-out circuit and an overcurrent detection circuit. It can be used with an external N-Channel MOSFET as the main switch. Additionally, it includes an accurate reference voltage and a wide range of operating frequencies, from 8kHz to 200kHz, to reduce EMI and enable higher efficiency. And its fast transient response ensures an instantaneous response to changing output load.In conclusion, the SG1843Y-DESC is a complete, high-efficiency, low noise and low-EMI DC-DC converter designed for industrial control, mobile power, and other applications with high-power LED lighting, automotive rear combination light, and TV power supplies. It provides fast transient response, high accuracy in voltage regulation, and the flexibility of working at a wide range of operating frequencies. Therefore, it is an ideal solution for many electronic applications.

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