MIC38HC45BN

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The MIC38HC45BN is a high performance precision controlled power conversion Pulse Width Modulator (PWM) designed specifically for cost sensitive applications. This device is built using CMOS technology and utilizes a chopper stabilized PWM core to enable fast dynamic response and low parts count designs. The integrated half bridge buffer, synchronized gate drive and regulated over voltage protection enhance system semiconductor reliability.

The MIC38HC45BN can be configured with the internal control logic to operate safely in either Constant Frequency or Constant on Time (COT) mode. The combination of an accurate internal reference, temperature compensated ramp generator and precise current sensing ensures a high degree of system regulation.

The PWM deadband is also adjustable and when configured correctly helps prevent cross conduction of the MOSFETs which reduces EMI and increases device efficiency.

The MIC38HC45BN is a highly efficient forward converter controller and is most commonly used in applications in the industrial and consumer markets such as power supplies for telecoms and computers, motor control and induction heating.

Application Field

The MIC38HC45BN is a PWM Controller designed for high efficiency forward topologies such as Self-Excited Forward (SEF) and Multiple Output MAX/MIN Forward (MOMF) Converters. The device can be used in electronic power supplies, portable computers, DVD players, and telecommunication applications, etc. Its wide supply voltage range and operating temperature range make it suitable for almost any application.

Working Principle

The MIC38HC45BN is a PWM controller designed for high efficiency forward topologies. It features an integrated half bridge driver, voltage regulation and adjustable deadband. The device uses a chopper stabilized PWM core which is used to provide fast dynamic response and low parts count designs.

In order to ensure a high degree of system regulation, the MIC38HC45BN includes an accurate internal reference, temperature compensated ramp generator and precise current sensing. This device also offers the ability to configure sites for either constant frequency or constant on time (COT) mode.

The MIC38HC45BN has adjustable deadband which is used to help prevent cross conduction of the MOSFETs and ultimately reduce EMI and increase device efficiency. This is achieved by adjusting the voltage difference between the rising and falling edges of the output signal.

The MIC38HC45BN is a highly efficient device and can be used in both industrial and consumer applications such as power supplies for telecoms, computers, motor control and induction heating.

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