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DC DC Converters

Introduction

The PT6722N is a high-performance DC-DC converter specially developed for use in medical, industrial, and consumer applications. It offers great versatility with a wide input voltage range and a wide output voltage range. Additionally, the PT6722N is equipped with a primary-side voltage and current protection for safety, and supports a wide temperature range. The DC-DC converter also features low EMI noise, low start-up/on-resistance, soft-start, voltage feedback, and current feedback.

Features

• Wide input voltage (6~36V)
• Wide output voltage (1.2~36V)
• Up to 0.6A output current
• High efficiency up to 95%
• Excellent thermal performance
• Primary side voltage/current protection
• Low EMI noise
• Wide temperature design (-40°C~+100°C)

Working Principle

The working principle of the PT6722N is based on an open-loop primary-side control, which uses the inherent relationship between the input line voltage and the input current, to detect the output voltage at the secondary side. The PT6722N is an example of a closed-loop control system, which measures both the input current and voltage, and adjusts the voltage and frequency to maintain the desired output voltage at the power switch. This is achieved through on-time/off-time (t on/off) control, which is a two-stage gate driver for the power switch.

The PT6722N have an integrated over-current protection circuit, which senses the input current and shuts off the power switch when the current rises above the set threshold. Additionally, the on-chip power switch has a built-in over-voltage protection circuit, which shuts off the power switch if the input voltage rises above the specified threshold. This protection feature is essential for safe operation of the PT6722N even under harsh conditions.

Conclusion

The PT6722N is a highly versatile DC-DC converter, ideal for medical, industrial, and consumer applications requiring a wide input/output voltage ranges, high efficiency, and low EMI noise. It has excellent thermal performance and offers primary-side voltage/current protections for safety and reliable operation. The PT6722N utilizes on-time/off-time control to maintain the output voltage, with high-level programming flexibility and wide temperature ratings.

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