Overview
The UC1834 family, inclusive of UC1834, UC2834, and UC3834 models, comprises integrated circuits designed for the development of low input-output differential linear regulators. These regulators are efficient in maintaining a voltage output with a minimal voltage input difference, making them ideal for high current applications due to their ability to operate with an external pass device. The UC1834 series is notable for its versatility, functioning effectively in both positive and negative regulator designs.
Key Features
These integrated circuits are capable of handling a minimum input-output voltage difference of less than 0.5V, even with a 5A load, via an external pass device. They boast embedded features to enable positive or negative regulator design flexibility, and they incorporate a high gain amplifier along with 200mA sink or source drive outputs to support high output currents. An adjustable low-threshold current sense amplifier is also included, which allows for current sensing and limitation in either positive or negative supply lines.
Fault Monitoring and Protection: The family features comprehensive fault monitoring, which alerts the system to under-voltage or over-voltage conditions after a predefined delay period. Over-voltage faults trigger a 100mA crowbar output and the system includes an over-voltage latch to maintain the crowbar state or to shut down the driver outputs. Furthermore, the chips provide a single point of control for system reset and remote shutdown functionality.
Thermal and Voltage Regulation
A vital safety feature incorporated within these ICs is the thermal shutdown functionality, which serves to protect the device from damage due to excessive power dissipation. Additionally, the family is equipped with both a positive and negative precision voltage reference, enabling it to deliver consistent and precise voltage regulation for a variety of applications.
Block Diagram Description
The block diagram presented delineates the internal structure of the UC1834 series. It illustrates the various components, such as the driver sink and source, error amplifier, voltage references, and the crowbar gate over-voltage latch. Also shown are the under and over-voltage detection with delay and reset latch, and the fault alert mechanisms. The sense amplifier with threshold adjustment and thermal shutdown components further highlight the IC’s regulation capabilities and protective measures.
Summary of Contents
The first two pages of the datasheet for the UC1834 family represent an introduction to the capabilities of these linear regulators, emphasizing the flexibility in design, the high-efficiency output current capability, fault management with programmable delays, and thermal protection. These ICs are tailored for applications that require reliable and efficient voltage regulation with the sophistication to handle various fault conditions and thermal stresses.
Manual:
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