UC3843 PWM Controller
The UC3843 is a current-mode PWM controller designed for stable and fast switching performance in DC–DC converters and offline power supplies. It provides accurate duty-cycle control, a trimmed internal oscillator, and a 5 V reference that help maintain consistent output regulation under changing load and input conditions. Its totem-pole output stage supports direct MOSFET gate driving, making it suitable for both DIP-8 and SOP-8 PCB layouts.
The device integrates UVLO, pulse-by-pulse current limiting, and low start-up current to support controlled operation in a wide range of power circuits. These functions help reduce stress on external components and improve overall system stability. With switching capability up to 500 kHz and predictable timing behavior, the UC3843 is frequently used in auxiliary power modules, flyback converters, battery-powered equipment, and general power regulation systems.
Its compact package options and compatibility with high-frequency designs allow efficient use in industrial and commercial power electronics. The UC3843 supports applications requiring fast response, controlled switching characteristics, and dependable performance across common operating conditions. For complete electrical characteristics, refer to the manufacturer datasheet linked below.
Key Specifications
| Parameter | Value | Notes |
|---|---|---|
| Device type | Current-mode PWM controller | UCx84x family (UC3843 variant) |
| VCC recommended range | 12 V to 28 V | Based on manufacturer recommended conditions |
| UVLO thresholds | 8.4 V (ON) / 7.6 V (OFF) | With hysteresis |
| Reference voltage | 5.0 V | Internally trimmed |
| Switching frequency | Up to 500 kHz | Set by external RT/CT |
| Output stage | Totem-pole | Supports MOSFET gate drive |
| Average output current | ~200 mA | Typical |
| Start-up current | < 1 mA | Supports offline supply start-up |
| Features | UVLO, current limiting | Integrated protection |
| Packages | DIP-8, SOP-8 | Through-hole and SMD |
| Operating temperature | 0°C to 70°C | UC384x commercial grade |
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