PT5546C

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DC DC converters are electrical components which are used to create a constant voltage output level from an alternating current (AC) input. The PT5546C is a DC DC converter which provides an adjustable current output for high efficiency and wide range applications. This article examines the application fields and working principles of the PT5546C.

Overview

The PT5546C is a 4-way switching mode DC DC converter which provides a maximum power output of 5 watts. This device uses a buck-boost topology to exceptionally efficiently convert a DC input voltage to an adjustable DC output voltage. This device uses pulse width modulation (PWM) to generate the output voltage from the input voltage. The PT5546C is available in a small SSOP (small-outline package) package which is suitable for a wide range of applications.

Application Fields

The PT5546C is suitable for a wide range of low voltage, low power applications across different industries. These include:

• Medical equipment: The PT5546C can be used for powering medical equipment, such as medical monitors, defibrillators and stethoscopes.
• Consumer electronics: The PT5546C can be used for powering consumer electronics, such as laptop computers, portable media players and digital cameras.
• Automotive electronics: The PT5546C can be used for powering automotive electronic systems, such as airbag controllers and anti-lock braking systems.

Working Principle

The PT5546C utilizes a buck-boost topology which allows it to efficiently convert a DC input voltage to an adjustable DC output voltage. This topology consists of a high-side and low-side switch connected in series, which are alternately switched on and off. When the high-side switch is on and the low-side switch is off, the output voltage is governed by the input voltage. On the other hand, when the low-side switch is on and the high-side switch is off, the output voltage is governed by the input voltage plus the internal switching voltage.

The switching frequency is determined by the pulse width modulation. The pulse width modulation is set by adjusting the internal PWM control signal. This internal PWM is generated by a pulse-width modulation circuit, which in turn is controlled by an external timer or oscillator. The PWM is used to control the on and off time of the switches, thus controlling the output voltage. The switching frequency of the PT5546C is typically in the range of 100 kHz to 1MHz.

The PT5546C is protected from over-temperature and over-current conditions by an integrated over-temperature/over-current protection (OTP) circuit. The OTP circuit monitors the output current of the PT 5546C and will shut down the converter if the current exceeds the set threshold. The OTP circuit also monitors the temperature of the device and will shut down the converter if the temperature reaches a predetermined level.

Conclusion

The PT5546C is a 4-way switching mode DC/DC converter which provides a maximum power output of 5 watts. This device is suitable for a wide range of low voltage, low power applications across different industries, such as medical equipment, consumer electronics and automotive electronics. The PT5546C utilizes a buck-boost topology which allows it to efficiently convert a DC input voltage to an adjustable DC output voltage. The PT5546C is also protected from over-temperature and over-current conditions by an integrated over-temperature/over-current protection (OTP) circuit.

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