UC3526DW

Frequency - Switching:	1Hz ~ 400kHz
Base Part Number:	UC3526
Supplier Device Package:	18-SOIC
Package / Case:	18-SOIC (0.295", 7.50mm Width)
Operating Temperature:	0°C ~ 70°C (TA)
Control Features:	Enable, Frequency Control, Reset, Soft Start
Serial Interfaces:	--
Clock Sync:	Yes
Synchronous Rectifier:	Yes
Duty Cycle (Max):	49%
Series:	--
Voltage - Supply (Vcc/Vdd):	8 V ~ 35 V
Output Phases:	1
Number of Outputs:	2
Topology:	Buck, Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, Push-Pull
Output Configuration:	Positive
Function:	Step-Up, Step-Down, Step-Up/Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tube

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The UC3526DW integrated circuit (IC) is a DC/DC Switching Controller designed for use in controlling wide variety of applications such as power supplies and voltage regulators. Based on a self-biasing approach, it is also suitable for step-down/up dc-to-dc converters, resonant converters, isolated converters, and synchronous rectifiers. The device provides Maximum Power Point (MPP) Tracking in systems that are powered by solar energy or other renewable sources. It has multiple operating modes, including cycle-by-cycle current limit, frequency modulation, reset current limit, and voltage regulation. It also features a preset current limit and fault protection capabilities such as cycle slip, protect bad, over-temperature, and under-voltage protection, making it an ideal solution for a wide range of power management applications.

Features of the UC3526DW

• A self-biasing circuit for compliance with the strictest efficiency and power distribution requirements
• Wide input voltage range of 4.5V to -25V
• Maximum power point tracking (MPPT) for solar energy applications
• Input range of 15mA to 5A with a minimum turn off delay of 7.3µs
• 20MHz clock with 3-level over-current protection and cycle slip detection
• Preset current limit feature with 8 variation selections
• Burst mode quiescent current control up to 0.7mA for better power efficiency
• Fault protection for over-temperature, under-voltage and protect bad switches

Working Principle of the UC3526DW

The UC3526DW has a wide operating voltage range, allowing it to be used for both step-down and step-up DC-to-DC conversion. It is capable of driving external MOSFET switching transistors with frequencies of up to 20MHz and with operating duty cycles ranging from 0 - 100%. When the operating frequency is set higher than the oscillator’s clock frequency, the device switches at the rate of the oscillator’s clock. When the operating frequency is set lower than the clock frequency, the device switches at the rate of the operating frequency. The device can perform power conversion over a wide range of switching frequencies depending on the requirement of the application.Fault protection features are available on the device that include cycle slip detection, protect bad switches, over-temperature protection and under-voltage protection. These features ensure that the device is able to operate safely even in the most hostile conditions. The device also features a preset current limit function that allows the user to select from eight choices of current limit level. This feature helps to prevent damage to the system from over-current conditions.

Applications for the UC3526DW

The UC3526DW can be used in a wide range of applications, including power supplies, voltage regulators, and converters. It\'s ideal for systems that require high-efficiency power management, such as solar energy systems, supervisory circuits, and automotive applications. The UC3526DW can also be used in resonant converters, where it provides a fixed frequency and allows for the optimization of converter efficiency. In this application, the device can be used to reduce ripple voltage, improve output voltage accuracy, reduce the size of the filter components, and improve the system’s overall power efficiency. The UC3526DW is also well-suited for synchronous rectifiers, where it can be used to reduce switching losses and switched capacitive losses. It is also capable of driving both N-channel and P-channel MOSFETS, which makes it ideal for use in power factor correction (PFC) applications. In addition, it can be used to control isolated converters, such as flyback or forward converters. This makes it ideal for applications such as dimmable LED drivers. It is also capable of driving two output switches simultaneously, making it capable of implementing advanced topologies such as interleaved buck topology.In conclusion, the UC3526DW is an ideal solution for a wide range of power management applications. Its high accuracy and wide operating voltage range make it suitable for step-down/up DC-to-DC conversion, as well as other advanced topologies. Its preset current limit and fault protection features make it safe and robust in the most challenging applications, and its high-efficiency operation helps to reduce system costs.

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