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Vicor Corporation

PI2002 Datasheet Preview

PI2002 Datasheet

Active ORing Controller

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PI2002
Cool-ORingTM Series
Active ORing Controller IC with Load Disconnect Feature
Description
The PI2002 Cool-ORingTM solution is a high-speed
Active ORing controller IC with a load disconnect
feature designed for use with back-to-back N-
channel MOSFETs in redundant power system
architectures. The PI2002 Cool-ORing controller
enables an extremely low power loss solution with
fast dynamic response to fault conditions, critical for
high availability systems. The PI2002 controls back-
to-back MOSFETs providing true bi-directional
switch capabilities to protect against both power
source and load fault conditions.
The gate drive output turns the MOSFETs on in
normal steady state operation, while achieving high-
speed turn-off during input power source fault
conditions, that cause reverse current flow, with
auto-reset once the fault clears. The PI2002 has the
added benefit of being able to protect against output
load fault conditions that may induce excessive
forward current and device over-temperature by
removing gate drive from the back-to-back
MOSFETs with an auto-retry programmable off-time.
The back-to-back MOSFETs drain-to-drain voltage is
monitored to detect normal forward, excessive
forward, light load and reverse current flow. The
PI2002 provides an active low fault flag output to the
system during fault condition. A temperature
www.DastaeSnhseient4gU.cfoumnction turns off the MOSFETs and
indicates a fault if the junction temperature exceeds
145°C.
Features
Power Source & Load Fault Protection
Fast Dynamic Response, with 120ns reverse &
150ns forward over-current turn-off delay time
4A gate discharge current
Accurate back-to-back MOSFETs drain-to-drain
voltage sensing to indicate system level fault
conditions
Programmable under & over-voltage detection
Over temperature fault detection
Programmable over-current Gate off time
Programmable short circuit load detection
function
Active low fault flag output
Applications
N+1 Redundant Power Systems
Servers & High End Computing
Telecom Systems
Active ORing with Load Disconnect
High current Active ORing
Package Options
The PI2002 is offered in the following packages:
3mm x 3mm 10 Lead TDFN package
8 Lead SOIC
Typical Applications:
Figure 1a: PI2002 High Side ORing with load disconnect
Figure 1b: PI2002 Low Side Disconnect Switch
Picor Corporation • picorpower.com
PI2002
Rev1.1 Page 1 of 23




Vicor Corporation

PI2002 Datasheet Preview

PI2002 Datasheet

Active ORing Controller

No Preview Available !

Pin Description
Pin
Name
Pin Number
10-Pin SO-8
DFN
GND
1
1
GATE
2
2
VC 3
OCT
4
3
4
SCD
5
n/a
FT 6
SP 7
SN 8
www.DataSUhVeet4U.com9
5
6
7
8
OV 10
n/a
Package Pin-Outs
Description
Ground: This pin is ground for the gate driver and control circuitry.
Gate Drive Output: This pin drives the gates of the external Back-to-Back N-
channel MOSFETs. Under normal operating conditions, the GATE pin pulls high to
10V (typ) with respect to the SN pin. The controller turns the gate off during all fault
conditions except the Low Forward Current condition.
Controller Input Supply: This pin is the supply pin for the control circuitry and gate
driver. Connect a 1μF capacitor between VC pin and the GND pin. Voltage on this
pin is limited to 15.5V by an internal shunt regulator. For high voltage auxiliary
supply applications connect a shunt resistor between VC and the auxiliary supply.
Over-Current Timer Input: Connecting a capacitor ( 20nF) sets the gate off time
once an over-current condition is detected. No capacitor on this pin will result in
minimum off time, 40µs. Pulling this input low will disable Gate drive.
Short Circuit Detect Input: This input pin is for setting the load voltage where a
short circuit level is defined and detected. To enable slow MOSFET turn-on mode,
connect SCD to VC. Connect to load point for minimum threshold (0.335V) or use
resistor divider to increase threshold. Grounding pin enables the fast MOSFET turn
on mode. This pin is not available in the SO-8 package and the controller is set for
low Gate source current, 300µA.
Fault State Output: This open collector output pulls low 40µs after a fault condition
occurs. Fault logic inputs are VC Under-Voltage, input Under-Voltage, input Over-
Voltage, Forward Over-Current, Reverse Current, Low Forward Current (or shorted
switches) and Over-Temperature. Leave this pin open if unused.
Positive Sense Input & Clamp: Connect SP pin to the input power source side of
the MOSFETs. The polarity and magnitude of the voltage difference between SP
and SN provides an indication of current flow through the MOSFETs.
Negative Sense Input & Clamp: Connect SN to the output load side of the
MOSFET. The polarity and magnitude of the voltage difference between SP and SN
provides an indication of current flow through the MOSFETs.
Input Under-Voltage Input: The UV pin is used detects when the input is less than
the Under-Voltage threshold resulting in a low Fault pin. The input voltage UV
threshold is programmable through an external resistor divider. During an Under-
Voltage fault, the Gate is pulled low. Connect UV to VC to disable this function.
Input Over-Voltage Input: The OV pin detects when the input is greater than the
Over-Voltage threshold resulting in a low Fault pin. OV “AND” a Forward Current
condition turns the MOSFETs off. The input voltage OV threshold is programmable
through an external resistor divider. Connect OV to GND to disable this function.
This pin is not available in the SO-8 package and OV function is disabled.
10 Lead TDFN (3mm x 3mm)
Top view
Picor Corporation • picorpower.com
8 Lead SOIC (5mm x 6mm)
Top view
PI2002
Rev1.1 Page 2 of 23


Part Number PI2002
Description Active ORing Controller
Maker Vicor Corporation
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PI2002 Datasheet PDF






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