MIC38C45YM

Frequency - Switching:	500kHz
Base Part Number:	MIC38C45
Supplier Device Package:	8-SOIC
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Operating Temperature:	-40°C ~ 85°C (TA)
Control Features:	Frequency Control
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	Yes
Duty Cycle (Max):	50%
Series:	--
Voltage - Supply (Vcc/Vdd):	7.6 V ~ 20 V
Output Phases:	1
Number of Outputs:	1
Topology:	Buck, Boost, Flyback, Forward Converter
Output Configuration:	Positive, Isolation Capable
Function:	Step-Up, Step-Down, Step-Up/Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tube

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Introduction

MIC38C45YM is a digital Pulse Width Modulation (PWM) Current Mode Controller with digital power control. It is designed for extended temperatures and is used in a variety of settings, from embedded applications to DC-DC switching controllers. This article will look at the application fields for the MIC38C45YM, as well as the device’s working principle.

Application Fields

The MIC38C45YM is intended for use in a variety of application settings. First and foremost, the device is designed for use in DC-DC switching applications, where low noise and high precision are paramount, such as computer platforms, networking and distributed power systems, server and storage power supplies, and telecom/industrial supplies. When used as a Pulse Width Modulated current mode controller, the MIC38C45YM ensures quiet operations, even at low power levels, which is necessary for high-end computing and portable device applications.Furthermore, the MIC38C45YM can be used to power embedded systems, including Automotive and Aerospace applications. The device is designed to withstand temperatures up to -40°C to 125°C, and thus can handle extreme environmental conditions for these fields. The MIC38C45YM is also an excellent choice for PoE (Power-over-Ethernet) applications, such as lighting, home audio, and surveillance systems.

Working Principle

The MIC38C45YM is a digital PWM current mode controller. It uses an external reference voltage to control the current level within the system. This reference voltage is compared with a sense voltage that is proportional to the system’s input current. When the reference voltage is greater than the sense voltage, the controller will close the output switch. Conversely, when the reference voltage is less than the sense voltage, the output switch is opened. This controls the transfer of power between the input and output of the system, and is what defines the device as a DC-DC switching controller.The MIC38C45YM is also equipped with a Proportional-Integral (PI) loop to provide stable and accurate voltage regulation. The PI loop is responsible for regulating the output voltage of the controller, and is adjusted through changes in the reference voltage. Furthermore, the device is equipped with a range of protection circuitry and features, including under voltage lockout (UVLO), overvoltage protection (OVP), overtemperature protection (OTP), and overcurrent protection (OCP). This further enhances the stability and reliability of the system.

Conclusion

The MIC38C45YM is a highly versatile digital PWM current mode controller designed for a variety of application settings. It is primarily used in DC-DC switching controllers to control the transfer of power between the input and output of the system. The device is also designed to operate in a variety of conditions, including Automotive and Aerospace, as well as PoE applications. The MIC38C45YM is equipped with a PI loop for voltage regulation and a range of protection features for safety and reliability.

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