The TL284x and TL384x series of control integrated circuits provide the features necessary to implement off-line or dc-to-dc fixed-frequency current-mode control schemes with a minimum number of external components. Some of the internally implemented circuits are an undervoltage lockout (UVLO) with a start-up current of less than 1 mA and a precision reference trimmed for accuracy at the error amplifier input. Other internal circuits include logic for latched operation, a pulse-width modulation (PWM) comparator (that also provides current-limit control), and a totem-pole output stage designed to source or sink high-peak current. The output stage, suitable for driving N-channel MOSFETs, is low when it is in the off state. Major differences between members of these series are the UVLO thresholds and maximum duty-cycle ranges.
The TL284x and TL384x series are current‑mode PWM controller integrated circuits designed for off‑line or dc‑to‑dc fixed‑frequency applications. They feature low start‑up current, an internal band‑gap reference, UVLO, pulse‑by‑pulse current limiting and a high‑current totem‑pole output suitable for driving N‑channel MOSFETs.
The document provides ordering information, functional block diagrams, absolute maximum ratings, recommended operating conditions, electrical characteristics, and layout guidelines, along with an important notice on product availability and warranty.
| Supply voltage range | 30 V |
|---|---|
| Operating temperature TL284x | -40 °C to 85 °C |
| Operating temperature TL384x | 0 °C to 70 °C |
| Oscillator frequency | 100 kHz to 500 kHz |
| Start‑up current | < 1 mA |
The start‑up current is less than 1 mA.
The oscillator can operate from 100 kHz up to 500 kHz.
The recommended supply voltage is up to 30 V.
The TL284x series operates from –40 °C to 85 °C.