The UCx84x series of current-mode PWM (Pulse Width Modulation) controllers, consisting of several parts including UC184x, UC284x, and UC384x, are specially designed integrated circuits (ICs) for power supply applications. Manufactured by Texas Instruments, these devices come in several package options and are designed to facilitate off-line or DC-to-DC fixed-frequency current-mode control configurations with minimal external components.
Features
Optimized for off-line and DC-to-DC converters: The series is fine-tuned for use in various power conversion applications, including converters that operate offline or with DC-to-DC conversion, ensuring efficiency and reliability.
- Low start-up current of less than 1mA
- Automatic feedforward compensation
- Pulse-by-pulse current limiting
- Enhanced load response characteristics
- Undervoltage lockout with hysteresis
- Double-pulse suppression
- High-current totem-pole output
- Internally-trimmed bandgap reference
- Up to 500 kHz operation
- Error amplifier with low output resistance
Applications
These controllers are suited for:
- Switching regulators of any polarity
- Transformer-coupled DC-DC converters
Description
The UCx84x series provides the necessary features for implementing fixed-frequency current-mode control schemes. The ICs include an undervoltage lockout (UVLO) feature with startup current less than 1mA, a precision reference trimmed for accuracy, and an error amplifier input. Additionally, other internal circuits such as a PWM comparator, provide current-limit control, and a totem-pole output stage designed to source or sink high-peak current. This output stage is suitable for driving N-channel MOSFETs and is low in off state.
Package and Temperature Options
Different models within the UCx84x series are offered in a variety of package types and are specified to operate over different temperature ranges. UC184x devices operate from -55°C to 125°C, UC284x devices from -40°C to 85°C, and UC384x devices from 0°C to 70°C. Package types include CDIP, LCCC, CFP, SOIC, and PDIP with different body sizes detailed in the data sheet.
For detailed package specifications, reference should be made to the orderable addendum at the end of the datasheet. The data sheet also includes a simplified application diagram for the UC2843, depicting the connections of VCC, OUTPUT, VREF, ISENSE, VFB, RT/CT, GROUND, and COMP pins, emphasizing the IC’s role in the power supply control ecosystem.
An important notice included in the data sheet addresses aspects related to availability, warranty, changes, use in safety-critical applications, intellectual property matters, and other significant disclaimers that are essential for users and designers considering these components for production use.
Manual:
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