MIC38C42BMM-TR

Duty Cycle:	96%
Base Part Number:	MIC38C42
Mounting Type:	Surface Mount
Supplier Device Package:	8-MSOP
Package / Case:	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Operating Temperature:	-40°C ~ 150°C (TJ)
Control Features:	Frequency Control
Fault Protection:	--
Frequency - Switching:	500kHz
Series:	--
Voltage - Supply (Vcc/Vdd):	9 V ~ 20 V
Voltage - Start Up:	14.5V
Topology:	Boost, Buck, Flyback, Forward
Voltage - Breakdown:	--
Internal Switch(s):	Yes
Output Isolation:	Isolated
Part Status:	Discontinued at Digi-Key
Packaging:	Tape & Reel (TR)

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Introduction

The MIC38C42BMM-TR is a monolithic linear integrated circuit developed by Microchip Technology Inc. It is designed to be used in power module integrated circuits (PMIC) applications as an offline switcher, AC/DC converter. This device combines the features of a high-efficiency, fixed-frequency, pulse-width modulation (PWM) controller with a high voltage, low-noise, fixed-frequency, synchronous rectifier. This device can reduce the size and complexity of the system by integrating the current sensing and control components into a single package.

Features

The MIC38C42BMM-TR offers a wide range of features that make it suitable for a variety of applications. These include:- High Voltage: Operating voltage of up to 40V.- Fixed Frequency: Switching frequency of 1 MHz.- Pulse Width Modulation: Provides PWM control that can be adjusted via external resistors.- Efficiency: High-efficiency operation in multiple topologies.- Current Sensing: Integration of the current sensing and control functions into a single package.- Synchronous Rectifier: Low-noise, fixed-frequency synchronous rectifier design.

Applications

The MIC38C42BMM-TR can be used in a variety of AC/DC and offline switching applications. These include power supplies, DC/DC converters, AC/DC supplies, motor control, and automotive control systems. It is especially suitable for applications requiring high efficiency, low noise, and high current control.

Working Principle

The MIC38C42BMM-TR operates on a fixed-frequency, pulse-width modulation (PWM) control principle. The device uses a fixed-frequency oscillator to generate the PWM signals. The current sense, also referred to as the shunt regulator, measures the current flow through the power MOSFET (metal oxide semiconductor field effect transistor) switch and adjusts the duty cycle of the PWM signal accordingly. This allows the device to accurately control the power output.The synchronous rectifier integrated within the device is used to convert the AC voltage into DC voltage. It operates at a fixed-frequency, allowing for low-noise operation and efficient conversion of the AC voltage.The PWM signal generated from the device is then used to control the power MOSFET. When the signal is high, the MOSFET is switched on and power flows through the circuit. When the signal is low, the MOSFET is switched off and power does not flow through the circuit. This allows the device to regulate the output voltage and power of the circuit.

Conclusion

The MIC38C42BMM-TR is a monolithic linear integrated circuit designed for AC/DC and offline switcher applications. It features a high voltage, low-noise, fixed-frequency, synchronous rectifier design and a high-efficiency, fixed-frequency, pulse-width modulation (PWM) controller. This makes the device suitable for applications requiring high efficiency, low noise and high current control. The integrated current sensing and control components make it suitable for a variety of power module integrated circuits (PMIC) applications.

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