PT4412A

Current - Output (Max):	30A
Base Part Number:	PT4412
Size / Dimension:	--
Package / Case:	21-SIP Module
Mounting Type:	Through Hole, Right Angle
Efficiency:	86.5%
Operating Temperature:	-40°C ~ 85°C
Features:	UVLO
Applications:	ITE (Commercial)
Voltage - Isolation:	1.5kV
Power (Watts):	100W
Series:	Excalibur™ PT4410
Voltage - Output 3:	--
Voltage - Output 2:	--
Voltage - Output 1:	1.05 ~ 1.75 V
Voltage - Input (Max):	75V
Voltage - Input (Min):	36V
Number of Outputs:	1
Type:	Isolated Module
Part Status:	Obsolete
Packaging:	Tray

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Introduction

DC-DC converters are devices which convert a DC voltage to a different DC voltage, either higher or lower. Generally, they are used to convert a higher voltage to a lower one, often in order to supply power to low-voltage devices. The PT4412A DC-DC converter is a highly efficient, low-profile power converter designed for a wide range of applications. It is a fixed frequency, synchronous, step-down DC converter.

Features

The PT4412A is a 4-A switch-mode, buck regulator designed for high-frequency, low-noise, and low-ripple applications. It is capable of delivering up to 4 A of current over a wide range of output voltages. The PT4412A features a very wide input voltage range from 4V to 25V, a programmable frequency range of 500 kHz to 9 MHz, and a wide range of adjustable output voltage (1V to 22V). It also has a current-mode PWM control, Fast Voltage Mode (FVMTM) technology, and a low dropout voltage (100 mV at 4 A). Furthermore, it is highly efficient, up to 89%, and its quiscent current is low (less than 1 mA). The PT4412A operates on an internal power switch and an internal synchronous rectifier, and it is rated for an operating temperature range of -40 to +125 degrees Celsius.

Application Field and Working Principle

The PT4412A is well-suited for a wide variety of applications, including home appliances, PDAs, digital video cameras, DC-DC power supplies, AC-DC power supplies, and many other low-voltage DC applications. The PT4412A can be used to replace a series of discrete components with a low-cost, integrated solution. It can also be used as the basis for a range of power supply applications.The PT4412A is a synchronous DC-DC buck converter. The basic working principle is to switch between on and off states rapidly to allow the storage of energy in the inductor and the delivery of a regulated output voltage at the output of the converter. The switching frequency is usually set to a range between 500 kHz and 9 MHz. The PT4412A contains an internal MOSFET, and the driver stage is built into the IC, eliminating the need for external components. This makes the circuit very compact. A current-mode PWM (Pulse Width Modulation) control method is used to control the switching of the internal power switch. A typical circuit for the power converter consists of an input filter for EMC compliance, an inductor, an output capacitor, an enable pin for controlling the on/off state of the device, an enable-inhibit circuit for enabling and disabling the output, and an external clock for setting the switching frequency.

Conclusion

The PT4412A is a highly efficient, low-profile DC-DC converter with low noise and low-ripple, current-mode PWM control, Fast Voltage Mode (FVMTM) technology, and a wide input and output voltage range. It is suited for a variety of low-voltage applications, from home appliances to PDAs to digital cameras, and it is a great replacement for a series of discrete components. The PT4412A is a buck converter with an internal MOSFET and an internal synchronous rectifier, and with the additional support of an input filter, an inductor, an output capacitor, an enable-inhibit circuit, and an external clock, it is able to supply a high-quality output voltage with low power dissipation.

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