KA7552A

Frequency - Switching:	--
Base Part Number:	KA7552
Supplier Device Package:	8-DIP
Package / Case:	8-DIP (0.300", 7.62mm)
Operating Temperature:	-25°C ~ 85°C (TA)
Control Features:	--
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	Yes
Duty Cycle (Max):	70%
Series:	--
Voltage - Supply (Vcc/Vdd):	8.7 V ~ 30 V
Output Phases:	1
Number of Outputs:	1
Topology:	--
Output Configuration:	Positive
Function:	--
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tube

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KA7552A Application Field and Working Principle

The KA7552A is a DC DC switching controller, a type of voltage regulator, produced by Fairchild Semiconductor. It is designed to regulate the output voltage of a power supply using pulse width modulation, and offers a number of features to maximize efficiency and minimize the external components needed. This includes independently programmable soft start and soft stop, as well as an integrated anti-shoot-through protection circuit.

Features

The KA7552A has a number of features that make it an attractive controller for DC DC conversion. These features include:

• Integrated MOSFET drivers and protection circuitry
• Programmable output voltage scaling to improve system efficiency
• Configurable soft-start and soft-stop to reduce in-rush current and maintain dynamic load
• Integrated anti-shoot-through control
• High efficiency frequency jittering
• Two different control methods: voltage mode and current mode
• Remote compensation and trim options

Applications

The KA7552A can be used in a variety of applications, from a simple buck converter to a complex multi-phase converter. It can be used for a wide range of power levels, from low power applications of a few watts to high power applications in the kilowatt range. In addition, it can be used in a variety of topologies, including buck, boost, buck-boost, forward, and flyback.

Working Principle

The KA7552A uses pulse width modulation (PWM) to regulate and control the output voltage of the power supply. The PWM controller constantly measures the output voltage, then adjusts the duty cycle of the output switch accordingly. With a low duty cycle, very little power is drawn from the input source. At higher duty cycles, more power is drawn from the input source. By carefully controlling the duty cycle, the KA7552A can efficiently maintain the desired output voltage.

Conclusion

The KA7552A is an advanced and feature packed DC DC switching controller from Fairchild Semiconductor. By incorporating independent soft start and stop, an integrated anti-shoot-through control, and high efficiency frequency jittering, the KA7552A is able to ensure optimal efficiency and performance for DC DC converters. With its wide range of supported topologies and power capabilities, the KA7552A makes an ideal choice for any DC DC conversion application.

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