DC684A

DC684A demonstration circuit is a 48VHotSwap™ controller featuring the LT4256-3 in a 2A application. The LT4256-3 is ideally suited for demanding power distribution control in 12V, 24V and 48V applications for hot board insertion protection, high side power switching, and electronic circuit breaker functions. The LT4256-3 provides a rich set of features to support hot swap applications including: overvoltage shutdown, undervoltage lockout, foldback inrush current limiting, overcurrent circuit breaker with programmable cutout time, programmable output voltage ramp rate, selectable Auto Retry or Latch off on overcurrent faults, power good monitor, open MOSFET detection.

• Input voltage range from 37V to 76V
• 36.3V ±1.5% undervoltage L to H threshold at UVLO pin threshold 4V ±1%
• 72.5V ±1.5% overvoltage L to H threshold at OVLO pin threshold 4V ±1%
• 2.75A ±20% current breaker trip point at (VCC – VSENSE) = 55mV ±20%
• Open circuit detection threshold <150mA at (VCC – VSENSE) < 3mV
• LT4256-3 in 16-lead SSOP package