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MSK5910RHG Fiches technique(PDF) 3 Page - M.S. Kennedy Corporation

No de pièce MSK5910RHG
Description  RAD TOLERANT ULTRA LOW DROPOUT ADJUSTABLE POSITIVE LINEAR REGULATOR
Download  8 Pages
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Fabricant  MSK [M.S. Kennedy Corporation]
Site Internet  http://www.mskennedy.com
Logo MSK - M.S. Kennedy Corporation

MSK5910RHG Fiches technique(HTML) 3 Page - M.S. Kennedy Corporation

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APPLICATION NOTES
VIN A,B,C,D,E - These pins provide the input power connection
to the MSK 5910RH. This is the supply that will be regulated to
the output. All five pins must be connected for proper opera-
tion.
VBIAS - This pin provides power to all internal circuitry including
bias, start-up, thermal limit and overcurrent latch. VBIAS volt-
age range is 2.8V to 7.5V. VBIAS should be kept greater than or
equal to VIN.
GND1 - Internally connected to input ground, these pins should
be connected externally by the user to the circuit ground and
the GND2 pins.
LATCH - The MSK 5910RH has a timed latch-off circuit which
provides overcurrent protection. An overcurrent or output short
condition will saturate the internal drive transistor. The time-out
latch will then be triggered and turn off the regulator. The time-
out period is determined by an external capacitor connected
between the latch and GND pins. Once the overcurrent condi-
tion is removed, the latch can be reset by pulling the SHUT-
DOWN pin high, grounding the LATCH pin or cycling power off,
then on. Holding the latch pin low disables current limiting. Un-
der normal conditions, the voltage at the LATCH pin is zero.
When the device is latched off, the voltage at the LATCH pin
will be 1.6V at 25°C.
SHUTDOWN - There are two functions to the SHUTDOWN pin.
It may be used to disable the output voltage or to reset the
LATCH pin. To activate the shutdown/reset functions the user
must apply a voltage greater than 1.3V to the SHUTDOWN pin.
The output voltage will turn on when the SHUTDOWN pin is
pulled below the threshold voltage. If the SHUTDOWN pin is not
used, it should be connected to ground.
FB - The FB pin is the inverting input of the internal error ampli-
fier. The non-inverting input is connected to an internal 1.265V
reference. This error amplifier controls the drive to the output
transistor to force the FB pin to 1.265V. An external resistor
divider is connected to the output, FB pin and ground to set the
output voltage.
GND2 - Internally connected to output ground, these pins should
be connected externally by the user to the circuit ground and
the GND1 pins.
VOUT A,B,C,D,E - These are the output pins for the device. All
five pins must be connected for proper operation.
Typically, large bulk capacitance is required at the output of a
linear regulator to maintain good load transient response. How-
ever, with the MSK 5910RH this is not the case. A 47µF surface
mount tantalum capacitor in parallel with a 0.1µF ceramic ca-
pacitor from the output to ground should suffice under most
conditions. If the user finds that tighter voltage regulation is
needed during output transients, more capacitance may be added.
If more capacitance is added to the output, the bandwidth may
suffer.
As previously mentioned, the LATCH pin provides over cur-
rent/output short circuit protection with a timed latch-off circuit.
The latch off time out is determined with an external capacitor
connected from the LATCH pin to ground. The time-out period is
equal to the time it takes to charge this external capacitor from
0V to 1.6V. The latch charging current is provided by an internal
current source. This current is a function of bias voltage and
temperature (see latch charging current curve). For instance, at
25°C, the latch charging current is 7.2µA at VBIAS=3V and
8µA at VBIAS=7V.
In the latch-off mode, some additional current will be drawn
from the bias supply. This additional latching current is also a
function of bias voltage and temperature (see latching current
curve).
The MSK 5910RH current limit function is directly affected by
the input and output voltages. Custom current limit is available;
contact the factory for more information.
3
Rev. I
3/06
POWER SUPPLY BYPASSING
To maximize transient response and minimize power supply
transients it is recommended that a 33µF minimum tantalum
capacitor is connected between VIN and ground. A 0.1µF ce-
ramic capacitor should also be used for high frequency bypass-
ing.
START UP OPTIONS
The MSK 5910RH starts up and begins regulating immediately
when VBIAS and VIN are applied simultaneously. Applying VBIAS
before VIN starts the MSK 5910RH up in a disabled or latched
state. When starting in a latched state the device output can be
enabled either by pulling the latch pin low to drain the latch ca-
pacitor or pulsing the shutdown pin high. The shutdown pulse
duration is partially dependent upon the size of the latch capacitor
and should be characterized for each application; 30uS is typically
adequate for a 1uF latch capacitor at 25°C. A momentary high
pulse on the shutdown pin can be achieved using the RC circuit
below if VIN rises rapidly. The resistor and capacitor must be
selected based on the required pulse duration, the rise character-
istic of VIN and the shutdown pin threshold (see shutdown pin
threshold and current curves).
The shutdown pin can be held high and pulled low after VIN comes
up or the latch pin held low and released after VIN comes up to
ensure automatic startup when applying VBIAS before VIN. Ei-
ther of the basic circuits below can be adapted to a variety of
applications for automatic start up when VBIAS rises before VIN.
PIN FUNCTIONS
OUTPUT CAPACITOR SELECTION
OVERCURRENT LATCH-OFF/LATCH PIN CAPACITOR
SELECTION


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