8D515M05AC

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Introduction

8D515M05AC is a current mode buck controller. This article will explore its application field and working principle.

Application Field

8D515M05AC is mainly used for automotive power, computer peripheral equipment power, and industrial control power. It is also used in a variety of power supply products (including switching power supplies, such as LED lighting, adapters, and other portable communication devices). 8D515M05AC can reach a high level of energy efficiency with minimal external component count, making it both cost effective and easy to use.

8D515M05AC can support a wide input voltage range from 6V to 42V, and can provide a programmable and adjustable output voltage from 0.89V to 36V. Different optional low resistance synchronous rectifiers can be used in the design to achieve 97.5% of high efficiency. The internal current limit sensing circuit of the 8D515M05AC can accurately control the output current of the external power switch, and the data is programmable to support up to 20A derating. In addition, its low component count, excellent jitter performance, and delay adjustable switching frequency make it a cost-effective choice for automotive and IT products.

Working Principle

The working principle of 8D515M05AC relies on its buck regulator topology. The 8D515M05AC uses a power switch, such as an N-channel MOSFET, to convert a source of input voltage into an output voltage. The control circuit connected to the power switch turns on and off at a certain frequency, which drives the power switch to generate a pulse width modulation (PWM) signal and modulates the amplitude of the output voltage. With the internal high-precision, high-speed, and low power consumption error amplifier as the core, the 8D515M05AC adjusts the voltage signal to the reference voltage to realize the voltage regulation.

The 8D515M05AC supports various protection functions such as input under voltage lockout (UVLO), over voltage protection (OVP), adjustable current limit, die temperature protection, and open loop protection. In addition, 8D515M05AC also has Ripple Rejection (RR rms) up to 50dB, and Gate Driver (VGD/VGDr) undershoot protection; soft start monitor current mode to improve start accuracy and reduce start-up stress; Soft Frequency Modulation (SFM) design reduces EMI generation.

Conclusion

8D515M05AC is a current mode buck controller widely used in automotive, computer peripheral, and LED lighting applications, due to its cost effectiveness, high power efficiency, and excellent protection functions. Its working principle relies on its buck regulator topology, which uses a power switch to convert a source of input voltage into an output voltage, and which utilizes an internal precision error amplifier to provide PWM signals and regulate output voltage.

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