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DC DC Converters

DC/DC converters are an efficient and practical way of converting electric power between different voltage levels. The PT6214D is an advanced integrated DC/DC step-down converter offering up to 4A output current with high accuracy, wide voltage input ranges, and a high efficiency topology. It is an ideal solution for power supply requirements in a variety of consumer electronic and automotive applications.

Features

• Integrated synchronous rectification step-down converter
• Input voltage range from 2.5V to 28V
• Output voltage range from 0.8V to 17V
• Output current up to 4A
• High efficiency: Up to 95%
• User-programmable Safety Timer function

Applications

The PT6214D is suitable for a variety of consumer and automotive applications, such as notebooks, netbooks, audio amplifiers, secondary power supplies, and charging systems. It is also well suited for industrial applications, such as telecom systems, instrumentation, distributed power management, and off-board power supplies.

Working Principle

The PT6214D is an integrated, synchronous rectification step-down DC/DC converter that takes an input voltage of 2.5V to 28V and regulates it to a user-configurable output voltage of 0.8V to 17V. It uses pulse-width modulation (PWM) and current-mode control techniques to precisely regulate the output voltage. The output voltage is regulated through a feedback loop, where a portion of the output voltage is fed back to control the duty cycle of the converter’s output stage. The duty cycle adjustment enables the converter to maintain a constant output voltage despite any changes in line or load conditions.

The PT6214D uses synchronous rectification to achieve high efficiency operation. The output stage consists of an internal low-RDS(ON) DMOS power switch and a diode that enables synchronous rectification. When the power switch is on, the switched side sources current to the load and the diode is reverse biased, preventing current from flowing backwards to the input. Upon turn off, the diode becomes forward biased, allowing the inductor current to continue flowing and be used to supply the output load.

The PT6214D also features an on-board user-programmable safety timer function. This timer allows the system to be protected from output short circuit or overcurrent conditions. After a fault condition is detected, the timer enables a safety latch-off circuit to reduce the output voltage to near zero and prevents further current from being sourced by the power converter. The timer reset requires external command from the system or the pull-high resistor.

Conclusion

The PT6214D is a highly integrated, synchronous rectification step-down DC/DC converter that offers excellent efficiency, a wide input voltage range, and user-programmable safety timer features. It is an ideal solution for applications that require low-voltage, high-current, and high-efficiency power supplies in consumer and automotive applications.

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