The IR21531 is an improved version of the popular IR2155 and IR2151 gate driver ICs, and in- corporates a high voltage half-bridge gate driver with a front end oscillator similar to the industry standard CMOS 555 timer.
The IR21531(D)(S)(PbF) driver IC from International Rectifier provides a self‑oscillating half‑bridge solution for high‑voltage applications up to 600 V. It integrates a 15.6 V zener clamp, micropower start‑up, and a shutdown feature on the CT pin, offering tight dead‑time control and improved noise immunity.
Key specifications include a typical oscillator frequency of 20 kHz, a maximum power dissipation of 1 W (8‑lead DIP), and a CT pin shutdown threshold of 1.8 V. The device is offered in lead‑free and non‑lead‑free versions, with detailed pin definitions and recommended component values for timing and filtering.