The document describes the features and characteristics of the IR2085S, a high-speed, 100V, self-oscillating 50% duty cycle, half-bridge driver. The product is suitable for half-bridge DC-bus converters in 48V distributed systems, reducing component count and board space. It features an integrated 50% duty cycle oscillator and half-bridge driver in a single SO-8 package. Each channel has a programmable switching frequency of up to 500kHz. The drive current capability is +/-1.0A, optimized for low charge MOSFETs. The adjustable dead-time ranges from 50ns to 200ns. The floating channel is designed for bootstrap operation up to +100Vdc. The high and low side pulse width matching is within +/-25ns. It also has adjustable overcurrent protection, undervoltage lockout, and internal soft start.
The document describes the IR2085S as a high-speed, self-oscillating half-bridge driver integrated circuit featuring a 50% duty cycle oscillator. It is designed to simplify primary side control solutions for distributed systems with reduced component counts.
Key features include programmable switching frequencies up to 500kHz per channel, adjustable dead-time between 50ns and 200ns, and +/-1A drive current capability. The IC includes undervoltage lockout, internal soft start, and overcurrent protection.
| Operating Frequency (per channel) | 500 kHz max |
|---|---|
| Dead-Time Range | 50nsec — 200nsec |
The recommended range for the timing resistor is between 10kΩ and 100kΩ.
The IR2085S is ideally suited for 36V-75V half-bridge DC-bus converters.