PI2003-00-QEIG Vicor

PI2003 Series Universal Active ORing Controller IC Description Features The PI2003 solution is a universal high- Optimized for -48V ORing applications speed Active ORing controller IC designed for use Fast Dynamic Response to Power Source with N-channel MOSFETs and is optimized for -48V failures, with 160ns reverse current turn-off redundant power system architectures. The PI2003 delay time Cool-ORing controller enables an extremely low 4A gate discharge current power loss solution with fast dynamic response to Accurate MOSFET drain-to-source voltage input power fault conditions, critical for high sensing to indicate system level fault conditions availability systems. The PI2003 controls single or Low quiescent current enables biasing directly parallel MOSFETs to address Active ORing from -48V (GND). applications protecting against power source 100V for 100ms operation in low side failures. The PI2003 is optimized for -48V low-side applications Active ORing applications. An internal VC shunt Active low fault flag output regulator enables biasing of the controller directly from -48V (GND). Applications Low-side -48Vbus Active ORing The gate drive output turns the MOSFET on during N+1 Redundant Power Systems normal steady state operation, while achieving high- Servers & High End Computing speed turn-off during input power source fault conditions, that cause reverse current flow, with Telecom Systems auto-reset once the fault clears. The MOSFET High current Active ORing drain-to-source voltage is monitored to detect normal forward, excessive forward, light load and Package Information reverse current flow. The PI2003 provides an active low fault flag output to the system during excessive The PI2003 is offered in the following packages: forward current, reverse current and light load. 10 Lead 3mm x 3mm DFN package 8 Lead SOIC package Typical Applications: Figure 1: PI2003 Low-Side Active ORing Picor Corporation picorpower.com PI2003 Rev 1.1 Page 1 of 16 Pin Description Pin Pin Number Name Description 10 Lead 8 Lead DFN SOIC GND 1 1 Ground: This pin is ground for the gate driver and control circuitry. Gate Drive Output: This pin drives the gate of the external N-channel MOSFET. Under normal operating conditions, the GATE pin pulls high to VC-0.5V. The GATE 2 2 controller turns the gate off during a reverse current fault that exceeds the reverse voltage threshold. Controller Input Supply: This pin is the supply pin for the control circuitry and gate driver. Connect a 1 F capacitor between VC pin and the GND pin. Voltage on this pin VC 3 3 is limited to 11V by an internal shunt regulator. For high voltage auxiliary supply applications connect a shunt resistor between VC and the auxiliary supply. Fault Clamp Input: Connect the FT pin to FC when it is pulled by a resistor to a 5 4 FC voltage higher than the VC pin to clamp it to VC plus a diode. Leave this pin open if unused. Fault State Output: This open collector pin pulls low when a fault occurs. Fault logic 6 5 inputs are VC Under-Voltage, Reverse Current, Forward Over-Current, and light load. FT Leave this pin open if unused. Positive Sense Input & Clamp: Connect SP pin to the Source pin of the external N- channel MOSFET close to the GND pin. The polarity of the voltage difference SP 7 6 between SP and SN provides an indication of current flow direction through the MOSFET. Negative Sense Input & Clamp: Connect SN to the Drain pin of the external N- SN 8 7 channel MOSFET. The polarity of the voltage difference between SP and SN provides an indication of current flow direction through the MOSFET. Package Pin-Outs 10 Lead DFN (3mm x 3mm) 8 Lead SOIC (5mm x 6mm) Top view Top view Picor Corporation picorpower.com PI2003 Rev 1.1 Page 2 of 16