KA3524

Frequency - Switching:	350kHz
Base Part Number:	KA3524
Supplier Device Package:	16-DIP
Package / Case:	16-DIP (0.300", 7.62mm)
Operating Temperature:	0°C ~ 70°C (TA)
Control Features:	Enable
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	No
Duty Cycle (Max):	45%
Series:	--
Voltage - Supply (Vcc/Vdd):	8 V ~ 40 V
Output Phases:	1
Number of Outputs:	1
Topology:	Buck, Flyback, Push-Pull
Output Configuration:	Positive, Isolation Capable
Function:	Step-Down, Step-Up/Step-Down
Output Type:	Transistor Driver
Part Status:	Obsolete
Packaging:	Tube

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KA3524: Application fields and working principles

KA3524 is a DC-to-DC switching controller integrated circuit (IC) based on a PI single-ended series architecture. It is a discrete voltage regulator that is commonly used in DC-to-DC switching applications, such as battery chargers, DC/DC step-up (BOOST) and buck converters.

Application fields

KA3524 is well suited for use in a variety of on-board power requirements, including mobile equipment, portable entertainment devices, computing and embedded systems and automotive applications. It is especially designed for applications that require current control, for example mobile equipment used in various applications like digital cameras, PDAs, and portable DVD players.KA3524 is also suitable for high performance computing applications such as Notebook PCs. By employing current-mode control, KA3524 is able to achieve higher power efficiency and improved powerline performance.

Working principles

The KA3524 can be used in current-mode or voltage-mode DC/DC converters. In current-mode control, the KA3524 regulates the output current. This is accomplished by sensing the output current and comparing it to a reference voltage. If the output current is not within the range of the set reference voltage, the KA3524 adjusts the control pulses to the main switch of the dc-dc converter. In voltage-mode control, the KA3524 senses the output voltage using a voltage feedback circuit and compares it to an external reference voltage. The KA3524 then adjusts the control pulses to the main switch of the DC-DC converter in order to maintain the output voltage. The KA3524 also features several features that enhance the performance of the dc-dc converter. For example, the KA3524 has an integrated over-current protection functionality, which automatically shuts down the dc-dc converter when the current limit is reached. Additionally, the KA3524 features a soft-start feature that limits inrush current and helps prevent output noise.

Conclusion

The KA3524 is a versatile DC-to-DC switching controller IC based on a PI single-ended series architecture. It is suitable for use in a variety of applications, including mobile equipment, portable entertainment devices, computing and embedded systems and automotive applications. It is especially designed for high performance computing applications such as Notebook PCs. The KA3524 is able to regulate the output current or voltage and features several features that enhance the performance of the dc-dc converter, such as over-current protection and soft-start.

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