UC3524DTR

Frequency - Switching:	300kHz
Base Part Number:	UC3524
Supplier Device Package:	16-SOIC
Package / Case:	16-SOIC (0.154", 3.90mm Width)
Operating Temperature:	0°C ~ 70°C (TA)
Control Features:	Current Limit, Enable, Frequency Control, Ramp
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:	2
Topology:	Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, Push-Pull
Output Configuration:	Positive
Function:	Step-Up, Step-Up/Step-Down
Output Type:	Transistor Driver
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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UC3524DTR Application Field and Working Principle

The UC3524DTR is a DC/DC switch controller designed to operate as a voltage regulator or as a converter in a DC/DC Buck converter with other components such as inductor, transistors, and transformers. It is a high-performance integrated circuit used in DC/DC power supplies.

Features

The UC3524DTR integrates many features in a single package which makes it possible to optimize performance and system power efficiency. It offers numerous protection features, like over temperature protection, pulse-by-pulse current limit and open / short compensation protection. This controller offers soft-start function, frequency jittering, and also a wide input voltage ranging from 8 V to 38 V.

Application Fields

Due to its high-performance, the UC3524DTR has extensive application fields, The DC/DC switching controller can be used for field generation and synchronous rectification in SMPS, voltage control module, uninterruptible power supply (UPS), automotive, matrix architecture with power control characteristic and so on.

Working Principle

The integrated circuit gets input voltage from an external voltage source and produces an output voltage at the terminals. The output voltage is regulated by the feedback circuitry. The input voltage is converted into a pulse width modulated voltage or pulse density modulation, which is then applied to the gate of the power MOSFET to drive the power supply. The power MOSFET gate is driven by a high frequency square wave at a frequency determined by the oscillator section of the IC. To ensure fast response and high performance, a low-pass filter is used to filter the high frequency signals. This filter prevents unwanted high-frequency signals from disturbing the operation of the power supply. The power MOSFET is turned on when high voltage is applied to the gate. The low-pass filter also helps reduce emissions, which can be harmful to other equipments that are operated in close proximity. The UC3524DTR has an integrated slope compensation circuit, which helps maintain a constant voltage output over a range of load conditions.

Conclusion

The UC3524DTR DC/DC switching controller is an integrated circuit that is widely used in DC/DC power supplies and offers high-performance with multiple protection features. This IC offers a wide input voltage range, fast response, and maintains a constant voltage output for a variety of load conditions. It is used for field generation and synchronous rectification in SMPS, voltage control module, uninterruptible power supply and many other applications.

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