PT4827C

Current - Output (Max):	8A, 6A, 6A
Base Part Number:	PT4827
Size / Dimension:	2.58" L x 1.62" W x 0.47" H (65.5mm x 41.1mm x 12.0mm)
Package / Case:	21-SMD Module
Mounting Type:	Surface Mount
Efficiency:	86%
Operating Temperature:	-40°C ~ 85°C
Features:	Remote On/Off, OTP, SCP, UVLO
Applications:	ITE (Commercial)
Voltage - Isolation:	1.5kV
Power (Watts):	35W
Series:	Excalibur™ PT4820
Voltage - Output 3:	1.8V
Voltage - Output 2:	2.5V
Voltage - Output 1:	3.3V
Voltage - Input (Max):	75V
Voltage - Input (Min):	36V
Number of Outputs:	3
Type:	Isolated Module
Part Status:	Obsolete
Packaging:	Tray

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DC DC Converters: PT4827C Application Field and Working Principle

DC DC Converters—PT4827C is an integrated DC-DC converter module. It is a highly efficient, low temperature, single-in-double-out switch mode built-in. It has a wide input voltage range, up to 20V; in combination with the fast-recovery Schottky diodes, the maximum output current is up to 15A. This module is suitable for a wide variety of applications such as USB charging, LED lighting, and DC power distribution.

Product Specification of PT4827C
The PT4827C DC-DC converter module employs a synchronous rectification technology, providing high efficiency and fast responses. It has an input voltage range of 4.5V to 20V and a constant voltage/current output of 5V or 3.3V with an accuracy of ±2%. The module was designed with a low temperature coefficient to deliver a stable output voltage over wide temperature range. The dimensions are 31.5mm × 30mm × 6mm.

Structure of PT4827C
The module is composed of a power switch circuit, synchronous rectification circuit, control circuit, and filter circuit. The main components of PT4827C are: inductor, switching mosfet, Schottky diode, op-amp, capacitors, and resistors. The inductor helps reduce conducted electromagnetic interference (EMI) and eliminate high frequency noises. The switching mosfet enables fast switching on and off of the power source while the Schottky diode is used to minimize the voltage drop due to reverse current during off-time of switching mosfet. The op-amp and capacitors are responsible for controlling DC-DC voltage feedback and output ripple. The resistor is used as temperature sensor to control the switching frequency of power section and to achieve a constant output current.

Working Principle of PT4827C
The working principle of PT4827C is based on the pulse width modulation (PWM) DC-DC Converter. In short, it helps to convert DC power from a source to a different voltage level or form for the motor or other load to utilize. The input voltage is compared to the reference voltage generated by the error amplifier and op-amp. The difference between input and reference voltage signals is then sent to the comparator. The comparator will generate a signal which will be used to drive the high-side mosfet switching on or off. The rising edge of the gate signal will turn on the high-side mosfet, initiating the inductor current flow. Current will continue to flow until the output voltage (which is being fed back to the error amplifier) is equal to the reference voltage. When the output voltage matches the reference voltage, the gate signal will turn off the high-side mosfet, terminating the inductor current. The Schottky diode will then conduct the inductor current to the VOut and the output voltage can maintain the original reference voltage. The inductor current is then reset and the process repeats itself to achieve continuous output with desired voltage.

Applications of PT4827C
The PT4827C module is suitable for a wide range of applications such as USB charging, LED lighting, and DC power distribution. It is an efficient, low-temperature DC-DC module, making it well-fitted for medical and IT equipments, which require frequent replacement due to overheating. In addition, PT4827C module is also suitable for battery-driven systems, which need to operate in both wide input voltage range and low standby current consumption. It is also applicable for consumer products such as digital cameras and PDAs which require low power and small size. The module has further benefits such as over-current protection and short-circuit protection, making it suitable for a variety of applications.

Conclusion
The PT4827C is a highly efficient, low temperature, single-in-double-out switch mode DC-DC converter module. With its wide input voltage range, fast-recovery Schottky diodes, and constant voltage/current output, the module suitable for a wide array of applications such as USB charging, LED lighting, and DC power distribution. It is also a perfect fit for battery-driven systems, medical and IT equipment, consumer products, and more. The PT4827C module is a great choice for applications that require high efficiency and reliability.

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