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LM5050-1 Datasheet(PDF) 11 Page - Texas Instruments

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Part # LM5050-1
Description  High Side OR-ing FET Controller
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM5050-1 Datasheet(HTML) 11 Page - Texas Instruments

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PS1
PS2
IN
GATE
OUT
IN
GATE
OUT
RLOAD
CLOAD
LM5050-1
LM5050-1
GND
GND
COUT
VS
VS
LM5050-1, LM5050-1-Q1
www.ti.com
SNVS629D – MAY 2011 – REVISED JUNE 2013
If the MOSFET current decreases to the point that the voltage across the MOSFET falls below the VSD(REG)
voltage regulation point of 27 mV (typical), the GATE pin voltage will be decreased until the voltage across the
MOSFET is regulated at 22 mV. If the drain-to-source voltage is greater than VSD(REG) voltage the gate-to-source
will increase, eventually reaching the 12V GATE to IN zener clamp level.
If the MOSFET current reverses, possibly due to failure of the input supply, such that the voltage across the
LM5050-1 IN and OUT pins is more negative than the VSD(REV) voltage of -28 mV (typical), the LM5050-1 will
quickly discharge the MOSFET gate through a strong GATE to IN pin discharge transistor.
If the input supply fails abruptly, as would occur if the supply was shorted directly to ground, a reverse current
will temporarily flow through the MOSFET until the gate can be fully discharged. This reverse current is sourced
from the load capacitance and from the parallel connected supplies. The LM5050-1 responds to a voltage
reversal condition typically within 25 ns. The actual time required to turn off the MOSFET will depend on the
charge held by gate capacitance of the MOSFET being used. A MOSFET with 47 nF of effective gate
capacitance can be turned off in typically 180 ns. This fast turn off time minimizes voltage disturbances at the
output, as well as the current transients from the redundant supplies.
VS PIN
The LM5050-1 VS pin is the main supply pin for all internal biasing and an auxiliary supply for the internal gate
drive charge pump.
For typical LM5050-1 applications, where the input voltage is above 5.0V, the VS pin can be connected directly
to the OUT pin. In situations where the input voltage is close to, but not less than, the 5.0V minimum, it may be
helpful to connect the VS pin to the OUT pin through an RC Low-Pass filter to reduce the possibility of erratic
behavior due to spurious voltage spikes that may appear on the OUT and IN pins. The series resistor value
should be low enough to keep the VS voltage drop at a minimum. A typical series resistor value is 100
Ω. The
capacitor value should be the lowest value that produces acceptable filtering of the voltage noise.
Alternately, it is possible to operate the LM5050-1 with VIN values less than 1V if the VS pin is powered from a
separate supply. This separate VS supply must be between 5.0V and 75V. See Figure 28.
OFF PIN
The OFF pin is a logic level input pin that is used to control the gate drive to the external MOSFET. The
maximum operating voltage on this pin is 5.5V.
When the OFF pin is high, the MOSFET is turned off (independent of the sensed IN and OUT voltages). In this
mode, load current will flow through the body diode of the MOSFET. The voltage difference between the IN pin
and OUT pins will be approximately 700 mV if the MOSFET is operating normally through the body diode.
The OFF pin has an internal pull-down of 5 µA (typical). If the OFF function is not required the pin may be left
open or connected to ground.
Figure 26.
Copyright © 2011–2013, Texas Instruments Incorporated
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Product Folder Links: LM5050-1 LM5050-1-Q1


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