IR2085S is a self oscillating half-bridge driver IC with 50% duty cycle ideally suited for 36V-75V half-bridge DC-bus converters. This product is also suitable for push-pull converters without restriction on input voltage.
The IR2085S (PbF) is a self‑oscillating half‑bridge driver IC designed for 36 V‑75 V DC‑bus converters. It integrates a 50 % duty‑cycle oscillator and driver in a single SO‑8 package, offering up to 500 kHz switching per channel and +/-1 A drive capability.
Key features include programmable switching frequency, adjustable dead‑time (50 ns–200 ns), over‑current protection, undervoltage lockout, internal soft‑start, and a lead‑free (PbF) version. The datasheet provides absolute maximum ratings, recommended operating conditions, electrical characteristics, functional block diagrams, pin descriptions, and a reference design example.
| Maximum switching frequency per channel | 500 kHz |
|---|---|
| Drive current capability | +/- 1 A (typ.) |
| Adjustable dead‑time range | 50 ns – 200 ns |
| Package type | SO‑8 |
| Operating voltage range (half‑bridge) | 36 V – 75 V |
| Maximum supply voltage (Vb) | 150 V |
The device can operate up to 500 kHz per channel.
It is supplied in an SO‑8 surface‑mount package.
Dead‑time can be set between 50 ns and 200 ns.
It can source and sink up to ±1 A of peak current.