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MSK5102-5.0 Datasheet(PDF) 3 Page - M.S. Kennedy Corporation

Part # MSK5102-5.0
Description  MSK5102-3.3H LOW DROPOUT VOLTAGE REGULATORS
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Manufacturer  MSK [M.S. Kennedy Corporation]
Direct Link  http://www.mskennedy.com
Logo MSK - M.S. Kennedy Corporation

MSK5102-5.0 Datasheet(HTML) 3 Page - M.S. Kennedy Corporation

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APPLICATION NOTES
HEAT SINK SELECTION:
To select a heat sink for the MSK 5102, the following formula
for convective heat flow may be used.
Governing Equation:
Tj = Pd x (R
θjc + Rθcs + Rθsa) + Ta
WHERE:
Tj = Junction Temperature
Pd = Total Power Dissipation
R
θjc = Junction to Case Thermal Resistance
R
θcs = Case to Heat Sink Thermal Resistance
R
θsa = Heat Sink to Ambient Thermal Resistance
Ta = Ambient Temperature
REGULATOR PROTECTION:
The MSK 5102 series is fully protected against reversed input
polarity, overcurrent faults, overtemperature conditions (Pd) and
transient voltage spikes of up to 60V. If the regulator is used in
dual supply systems where the load is returned to a negative
supply, the output voltage must be diode clamped to ground.
OUTPUT CAPACITOR:
The output voltage ripple of the MSK 5102 series voltage regu-
lators can be minimized by placing a filter capacitor from the
output to ground. The optimum value for this capacitor may
vary from one application to the next, but a minimum of 10µF is
recommended for optimum performance. Transient load response
can also be improved by placing a capacitor directly across the
load.
LOAD CONNECTIONS:
In voltage regulator applications where very large load currents
are present, the load connection is very important. The path
connecting the output of the regulator to the load must be
extremely low impedance to avoid affecting the load regulation
specifications. Any impedance in this path will form a voltage
divider with the load.
ENABLE PIN:
The MSK 5102 series of voltage regulators are equipped with a
TTL compatible ENABLE pin. A TTL high level on this pin acti-
vates the internal bias circuit and powers up the device. A TTL
low level on this pin places the controller in shutdown mode
and the device draws approximately 10µA of quiescent current.
If the enable function is not used, simply connect the enable pin
to the input.
First, the power dissipation must be calculated as follows:
Power Dissipation = (Vin - Vout) x Iout
Next, the user must select a maximum junction temperature.
The maximum allowable junction temperature is 125°C. The
equation may now be rearranged to solve for the required heat
sink to ambient thermal resistance (R
θsa).
EXAMPLE:
An MSK 5102-3.3 is configured for Vin=+5V and
Vout=+3.3V. Iout is a continuous 1A DC level. The ambient
temperature is +25°C. The maximum desired junction tem-
perature is 125°C.
R
θjc = 6°C/W and Rθcs = 0.5°C/W typically.
Power Dissipation = (5V - 3.3V) x (1A)
Solve for R
θsa:
R
θsa = 125°C - 25°C
- 6°C/W - 0.5°C/W
In this example, a heat sink with a thermal resistance of no more
than 52°C/W must be used to maintain a junction temperature
of no more than 125°C.
1.7W
= 1.7 Watts
DEVICE SOLDERING/CASE CONNECTION:
The MSK 5102 series are highly thermally conductive devices
and the thermal path from the package base to the internal junc-
tions is very short. Standard surface mount techniques should
be used when soldering the device into a circuit board. The
external heat sink/pad needs to be connected to ground because
the base of the MSK 5102 is also electrically connected to
ground. The user is urged to keep this in mind when designing
the printed circuit board for the MSK 5102. There should be no
printed circuit traces making contact with the base of the device
except for ground. The ground plane can be used to pull heat
away from the device.
Rev. B
2/06
3
= 52.3°C/W


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