The TL284xB and TL384xB series of high-performance current-mode PWM controllers provide low start-up current, precise reference, automatic feed-forward compensation, high-current totem-pole output, undervoltage lockout and double-pulse suppression, and can implement off-line or dc-to-dc fixed-frequency current-mode control schemes with a minimum number of external components.
The TL284xB and TL384xB series are high‑performance current‑mode PWM controller ICs designed for off‑line or DC‑to‑DC fixed‑frequency control schemes. They include an undervoltage‑lockout, precision reference, latchable PWM, and a high‑current totem‑pole output suitable for driving N‑channel MOSFETs.
The document lists ordering part numbers, package drawings, recommended operating conditions, absolute maximum ratings, and detailed electrical characteristics such as start‑up current, oscillator discharge current, UVLO thresholds, duty‑cycle limits, and temperature ranges.
| Start‑up current | < 0.5 mA |
|---|---|
| Oscillator discharge current (typical) | 8.3 mA |
| Typical UVLO thresholds (TLx842B/TLx844B) | 16 V on, 10 V off |
| Operating temperature range – TL284xB | -40 °C to 85 °C |
| Operating temperature range – TL384xB | 0 °C to 70 °C |
| Maximum duty‑cycle (TLx842B/TLx843B) | ≈ 100 % |
The start‑up current is less than 0.5 mA.
Typical thresholds are 16 V when on and 10 V when off.
TL284xB can operate from –40 °C to 85 °C.
The typical maximum duty‑cycle is about 50 %.