|
|
PDF PI2007 Data sheet ( Hoja de datos )
| Número de pieza | PI2007 | |
| Descripción | Universal High Side Active ORing Controller IC | |
| Fabricantes | Picor | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de PI2007 (archivo pdf) en la parte inferior de esta página. Total 19 Páginas | ||
|
No Preview Available !
PI2007
Cool-ORing® Series
Universal High Side Active ORing Controller IC
Description
The PI2007 Cool-ORing® solution is a universal
high-speed Active ORing controller IC designed for
use with N-channel MOSFETs in redundant power
system architectures. The PI2007 Cool-ORing
controller enables an extremely low power loss
solution with fast dynamic response to fault
conditions, critical for high availability systems. The
PI2007 controls single or parallel MOSFETs to
address Active ORing applications protecting
against power source failures. The PI2007 has an
internal charge pump enabling an ideal solution in
12V or 36-75V bus high-side Active ORing
applications.
The gate drive output turns the MOSFET on in
normal steady state operation, while achieving high-
speed turn-off during input power source fault
conditions, that causes reverse current flow. The
controller auto-resets once the fault clears. The
MOSFET drain-to-source voltage is monitored to
detect reverse current flow. The PI2007 has an
internal charge pump to drive the gate of a high side
N-Channel MOSFET above the VC input. There is
an internal shunt regulator at the VC input for high
voltage applications.
Features
Fast dynamic response to power source failure,
with 80ns reverse current turn off delay time.
4A gate discharge current
Forward Over Current Fault indication
Accurate MOSFET drain-to-source voltage
sensing
Internal charge pump
FET check at initial power-up
100V for 100ms, operation in high side
application
VC under voltage fault detection
Applications
N+1 Redundant Power Systems
Servers & High End Computing
Telecom Systems
High-side Active ORing
High current Active ORing
Package Information
The PI2007 is offered in the following packages:
10 Lead 3mm x 3mm DFN package
Typical Applications:
Figure 1: PI2007 High Side Active ORing for 12V
Bus applications
Picor Corporation • picorpower.com
Figure 2: PI2007 referenced to Vin in high voltage
high side Acti ve ORing applications
PI2007
Rev 1.3
Page 1 of 19
1 page  
Functional Description:
The PI2007 Cool-ORing controller IC is designed to
drive single or parallel N-channel MOSFETs in high
side Active ORing applications. The PI2007 used
with an external MOSFET can function as an ideal
ORing diode in the high 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 due to its high forward voltage drop.
This can allow for the elimination of complex heat
sinking and other thermal management
requirements.
Due to the inherent characteristics of the MOSFET,
current will flow in the forward and reverse directions
while the gate remains above the gate threshold
voltage. Ideal ORing applications should not allow
reverse current flow, so the controller has to be
capable of very fast and accurate detection of
reverse current caused by input power source
failures, and very fast turn off of the gate of the
MOSFET. 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.
Differential Amplifier:
The PI2007 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 the Reverse
and Forward comparators.
Reverse Current Comparator: RVS
The reverse current comparator provides the 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
force the gate discharge circuit to turn off the
MOSFETs in typically 80ns.
The reverse comparator will hold the gate low until
the SP pin is 6mV higher than the SN pin. The
reverse comparator hysteresis is shown in Figure 3.
There is a bias current path from SN to SP during
the reverse fault condition. The bias current is
proportional to the voltage between SN and SP.
The maximum SN pin bias current is 9mA when
VSN=80V and VSP=0V and assumes that the
MOSFET is in the off condition. Refer to Figure 15
in the Application Information section for more
details.
Forward Voltage Comparator: FWD
The FWD comparator detects when a forward
voltage condition exists and SP is above 275mV
(typical) positive with respect to SN. When SP-SN is
more than 275mV, the FWD comparator will assert
the Gate Status low to report a fault condition.
VC and Internal Voltage Regulator:
The PI2007 has a separate input VC that provides
power to the control circuitry, charge pump and gate
driver. An internal regulator clamps the VC voltage
(VVC-SGND) to 11.7V.
The internal regulator circuit has a comparator to
monitor the VC voltage and pulls the GATE pin low
when the VC is lower than the VC Under-Voltage
Threshold.
In 12V Bus applications (10V to 14V) the VR input
pin can be connected to the input voltage eliminating
the need for an external limiter. An internal 420Ω
resistor is connected between the VR pin and the
internal regulator VC pin.
Charge Pump:
The PI2007 has an integrated charge pump that
approximately doubles the VC voltage with
reference to the SGND pin, to drive the N-Channel
MOSFET gate to a voltage higher than the input
voltage at 15µA minimum source current.
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 20µA typical current source
to the MOSFET gate from the integrated charge
pump. The Charge Pump voltage is limited to
2*(VVC –VSGND -1V).
When a reverse current fault is initiated, the gate
driver pulls the GATE pin low to the PGND pin and
discharges the MOSFET gate with 4A typical peak
capability.
Fault Indication: FT
Figure 3: Reverse comparator hysteresis: VSP - VSN
The FT pin is an open collector NPN that will be
pulled low when the Gate pin is low. The FT pin is
also pulled low when VVC-SGND is below UVLO or
during the following fault conditions as indicated in
the table below:
Picor Corporation • picorpower.com
PI2007
Rev 1.3
Page 5 of 19
5 Page 
RZ
Vin _ MIN VZ _ MAX
I Z I B _ MAX
Where:
Vin_ MIN : Min input voltage
VZ _ MAX : Zener diode maximum breakdown voltage
I Z : Zener diode required reverse current
I B _ MAX : Q2 required maximum base current which
calculated from the following equation:
I hIB _ MAX
C _ MAX
FE _ MIN
I C _ MAX : Q2 maximum expected collector current.
hFE _ MIN :Q2 minimum gain.
Fault Indication:
FT is an open collector output and its return is
referenced to SGND. When SGND is referenced to
system ground, FT should be pulled up to the logic
voltage via a resistor (10KΩ). When the SGND pin is
floating on a bias resistor (RPG) or in a constant
current circuit, a level shift circuit can be added to
make the FT pin output referenced to the system
ground. See Figure 19. Leave FT unconnected if
not used.
Note that in case of an input fault condition, where
the input voltage (Vin) and the VC pin are at
ground and the SN pin is at a high voltage, a
parasitic path between SN and VC will draw bias
current (leakage current) from the output as a
function of the voltage between SN and grounded
VC (VSN-GND) based on the following equation:
I SN _ Lg
VSNGND 12V
RPAR
Where:
I SN _ Lg : SN leakage current during input short
VSNGND : Voltage difference between SN pin (or load
voltage) and ground.
RPAR :
Resistor in the parasitic path, 10KΩ typical
and 8kΩ minimum
Figure 15: SN leakage current vs. SN voltage during
input fault condition (input short)
N-Channel MOSFET Selection:
Several factors affect MOSFET selection including
cost, on-state resistance (RDS(on)), DC current rating,
short pulse current rating, avalanche rating, power
dissipation, thermal conductivity, drain-to-source
breakdown voltage (BVdss), gate-to-source voltage
rating (Vgs), and gate threshold voltage (Vgs(TH)).
The first step is to select a suitable MOSFET based on
the BVdss requirement for the application. The BVdss
voltage rating should be higher than the applied Vin
voltage plus expected transient voltages. Stray
parasitic inductance in the circuit can also contribute
to significant transient voltage conditions, particularly
during MOSFET turn-off after a reverse current fault
has been detected.
In Active ORing applications when one of the input
power sources is shorted, a large reverse current is
sourced from the circuit output through the MOSFET.
Depending on the output impedance of the system,
the reverse current may get very high in some
conditions before the MOSFET is turned off. Make
sure that the MOSFET pulse current capability can
withstand the peak current. Such high current
conditions will store energy even in a small parasitic
element. Note that PI2007 has a very fast response
time to a fault condition achieving 80ns typical and
150ns maximum. This fast response time will
minimize the reverse peak current to keep stored
energy and MOSFET avalanche energy very low to
avoid damage (breakdown) to the MOSFET.
Peak current during input short is calculated as
follows, assuming that the output has very low
impedance and it is not a limiting factor:
Picor Corporation • picorpower.com
I PEAK
VS * tRVS
LPARASITIC
PI2007
Rev 1.3
Page 11 of 19
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet PI2007.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| PI2001 | Universal Active ORing Controller IC |  Vicor Corporation |
| PI2002 | Active ORing Controller IC | Vicor Corporation |
| PI2003 | Universal Active ORing Controller IC | Vicor Corporation |
| PI2007 | Universal High Side Active ORing Controller IC | Picor |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |