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PDF ( 数据手册 , 数据表 ) PI2122

零件编号 PI2122
描述 12Amp Active ORing Solution
制造商 Vicor Corporation
LOGO Vicor Corporation LOGO 


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PI2122 数据手册, 描述, 功能
PI2122
Cool-ORing Series
12Amp Active ORing Solution With Load Disconnect
Description
The Cool-ORing PI2122 is a complete full-function
Active ORing solution with a high-speed ORing
MOSFET controller and a very low on-state
resistance Dual MOSFETs designed for use in
redundant power system architectures. The PI2122
Cool-ORing solution is offered in an extremely small,
thermally enhanced LGA package and can be used
in low voltage (5Vbus) high side Active ORing
applications. The PI2122 enables extremely low
power loss with fast dynamic response to fault
conditions, critical for high availability systems. The
PI2122 provide true bi-directional switch capabilities
to protect against both power source and load fault
conditions.
A load short circuit detection feature allows user
definition of a short condition enabling minimum duty
cycle into a short. The PI2122 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 turning off
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 status is reported via an active low
www.DaftaaSuhlteeftl4aUg.coomutput. A temperature sensing function
turns off the MOSFETs and indicates a fault if the
controller junction temperature exceeds 145°C.
Typical Application:
Features
Integrated High Performance 12A, 6mΩ back-to-
back MOSFET
Very-small, high density fully-optimized solution
providing simple PCB layout.
Fast Dynamic Response, with 140ns reverse &
170ns forward over-current turn-off delay time
Accurate sensing capability to indicate system
fault conditions
Programmable under & over-voltage functions
Over temperature shutdown
Programmable over-current off time
Programmable short circuit load detection
Active low fault flag output
Applications
N+1 Redundant Power Systems
Servers & High End Computing
High-side Active ORing
High current Active ORing ( 5Vbus)
MicroTCA
Package
5mm x 7mm 17-pin Thermally Enhanced LGA
Package
Figure 1: PI2122 High Side Active ORing
Picor Corporation • picorpower.com
Figure 1: PI2122 input current de-rating based on
PI2122
Rev1.0
Page 1 of 19







PI2122 pdf, 数据表
Figure 5: PI2122 Functional Block Diagram
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Figure 6: Typical comparators thresholds and hysteresis values.
Picor Corporation • picorpower.com
PI2122
Rev1.0
Page 8 of 19







PI2122 equivalent, schematic
Rds(on) = 9mΩ∗1.29 =11.61mΩ maximum at 111°C
Maximum power dissipation is:
Pdmax = Iin2 Rds(on) = (8A)2 11.61mΩ = 743mW
Recalculate TJ:w
TJ
max
=
70°C
+
⎜⎛
56°C
W
(8A)2
11.61mΩ⎟⎞
=
111.6°C
Reverse Current Threshold:
The following procedure demonstrates how to
calculate the minimum required reverse current in
the internal MOSFETs to generate a reverse fault
condition and turn off the internal Misfits at room
temperature (25°C) and typical Rds(on):
Is.reverse
=
Vth.reverse
Rds(on)
=
6mV
6mΩ
= −1.0A
Forward Over-Current threshold\:
The following procedure demonstrates how to
calculate typical forward current in the internal
MOSFETs to generate a forward over-current fault
condition and turn off the internal MOSFETs at room
temperature (25°C) and typical Rds(on):
I FOC
=
VFOC TH
Rds(on)
=
90mV
6mΩ
= 15A
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Figure 24: Plot of PI2122 response time to reverse current detection (Example 1, Figure 22)
Picor Corporation • picorpower.com
PI2122
Rev1.0
Page 16 of 19










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