PI2003-EVAL1【PDF 5/16 页】EVALUATION BOARD FOR PI2003

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Functional Description:

The PI2003 Cool-ORing controller IC is designed to

drive single or paralleled N-channel MOSFETs in

Active ORing applications, and optimized for -48V

applications. The PI2003 used with an external

MOSFET can function as an ideal ORing diode in

low side of a redundant power system, significantly

reducing power dissipation and eliminating the need

for heatsinking.

An N-channel MOSFET in the conduction path offers

extremely low on-resistance resulting in a dramatic

reduction of power dissipation versus the

performance of a diode used in conventional ORing

applications. This can allow for the elimination of

complex heat sinking and other thermal

management requirements. While the gate remains

above the gate threshold voltage it will allow current

to flow in the forward and reverse direction. Ideal

ORing applications do not allow for reverse current

flow, so the controller detect reverse current caused

by input power source failures and turn off the the

MOSFET as quickly as possible. Once the gate

voltage falls below the gate threshold, the MOSFET

is off and the body diode will be reverse biased

preventing reverse current flow and subsequent

excessive voltage droop on the redundant bus.

During forward over-current conditions the controller

maintains gate drive to keep the MOSFET forward

drop and power dissipation as low as possible.

While conventional ORing solutions using diodes

offer no protection against forward over-current

conditions. The PI2003 will provide an active-low

fault flag to the system via the FT pin. The fault flag

is also issued during the reverse current condition,

and light load or shorted MOSFET conditions.

Differential Amplifier:

The PI2003 integrates a high-speed low offset

voltage differential amplifier to sense the difference

between the Sense Positive (SP) pin voltage and

Sense Negative (SN) pin voltage with high accuracy.

The amplifier output is connected to three

comparators: Reverse comparator, Forward

comparator, and Forward over-current comparator.

Reverse Current Comparator: RVS

The reverse current comparator provides the most

critical function in the controller, detecting negative

voltage caused by reverse current. When the SN

pin is 6mV higher than the SP pin, the reverse

comparator will enable the gate discharge circuit and

turn off the MOSFETs in typically 160ns.

The reverse comparator has typically 3mV of

hysteresis referenced to SP-SN.

Forward Voltage Comparator: FWD

The FWD comparator detects when a forward

current condition exists and SP is 6mV(typical)

positive with respect to SN. When SP-SN is less

than 6mV, the FWD comparator will assert the Fault

flag to report a fault condition indicative of a light

load or “load not present” condition or possible

shorted MOSFET.

Forward Over Current Comparator: FOC

The FOC comparator indicates an excessive forward

current condition when SP is 150mV(typical) higher

than SN. When the GATE output voltage is greater

than 50% of the VC voltage and SP-SN is higher

than 150mV, the PI2003 will initiate a fault condition

via the FT pin.

VC and Internal Voltage Regulator:

The PI2003 has a separate input (VC) that provides

power to the control circuitry and the gate driver. An

internal regulator clamps the VC voltage (V VC-CLM ) to

11V.

VC may be tied to a voltage higher than V VC-CLM

through a resistor to limit VC current.

The internal regulator circuit has a comparator to

monitor VC voltage and initiates a FAULT condition

when VC is lower than the VC Under-Voltage

Threshold, 7.15V

Gate Driver:

The gate driver (GATE) output is configured to drive

an external N-channel MOSFET. In the high state,

the gate driver applies a 150μA current source to the

MOSFET gate limited to the VC voltage.

When a reverse current fault is initiated, the gate

driver pulls the GATE pin low and discharges the

FET gate with 4 Apeak capability.

When the input source voltage is applied before the

MOSFET is fully enhanced, a voltage greater than

the Forward Over Current (FOC) Threshold may be

present across the MOSFET. To avoid an erroneous

FOC detection, a VGS detector blanks the FOC and

FWD comparators from initiating a fault, until the

GATE pin reaches 50% of VC pin voltage.

Fault:

The fault circuit output is an open collector with 40 μ s

delay to prevent any false triggering. The FT pin

will be pulled low when any of the following faults

occur:

? Reverse current

? Forward Over-Current and V G > ? VC

?

Forward Low-Current and V G > ? VC

Picor Corporation ? picorpower.com

PI2003

Rev 1.1

Page 5 of 16

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