Overview
The UCx84xA series, as detailed in the datasheet provided by Texas Instruments, comprises optimized current-mode PWM controllers designed for various power supply applications. These devices are improved versions of the UCx84x series, engineered for off-line and DC-DC converters.
Features
The controllers have several key features that make them suitable for power supply design:
- Low Start-Up Current: Consumes less than 0.5 mA, which aids in reducing power consumption during the initial start-up phase.
- Trimmed Oscillator Discharge Current: Factory-trimmed to 8.3 mA to ensure consistent and reliable timing characteristics.
- Automatic Feedforward Compensation: Improves the response to input voltage changes.
- Pulse-by-Pulse Current Limiting: Provides protection against short circuits by immediately limiting the current during each pulse.
- Enhanced Load Response Characteristics: Ensures stable operation during dynamic load conditions.
- Undervoltage Lockout (UVLO) With Hysteresis: Prevents operation at insufficient voltages.
- Double Pulse Suppression: Eliminates potential for erroneous pulses which can degrade the performance and reliability of the controller.
- High-Current Totem Pole Output: Capable of driving external circuitry directly.
- Internally-Trimmed Bandgap Reference: Provides a precise reference voltage for various internal functions.
- Up to 500-kHz Operation: Supports high-frequency power supply designs.
Applications
These controllers are ideal for:
- Switch Mode Power Supplies (SMPS)
- DC-DC Converters
- Power Modules
- Industrial Power Supply Units (PSUs)
- Battery Operated PSUs
Device Information and Comparison
The family includes various models with different package options and body sizes tailored to specific applications and design requirements. A device comparison table outlines the UVLO thresholds and the maximum duty cycle for a subset of the devices:
| Device | UVLO On | UVLO Off | Max Duty Cycle |
|---|---|---|---|
| UC1842A | 16 V | 10 V | <100% |
| UC1843A | 8.4 V | 7.6 V | <100% |
| UC1844A | 16 V | 10 V | <50% |
| UC1845A | 8.4 V | 7.6 V | <50% |
A simplified application diagram is provided to illustrate the basic connection and operation within a typical power supply circuit, demonstrating the integration of the UCx84xA series controllers. Additionally, for a complete list of available packages for the series, the datasheet references an orderable addendum at its end.
Disclaimer
The datasheet concludes with an important notice regarding the product’s availability, warranty, suitability for use in safety-critical applications, intellectual property matters, and general disclaimers pertaining to production data.
Manual:
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