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CS5257A-1 Datasheet(PDF) 8 Page - ON Semiconductor

No. de pieza CS5257A-1
Descripción Electrónicos  7.0 A LDO 5?뭁in Adjustable Linear Regulator
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Fabricante Electrónico  ONSEMI [ON Semiconductor]
Página de inicio  http://www.onsemi.com
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CS5257A-1 Datasheet(HTML) 8 Page - ON Semiconductor

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solution. However, when the circuit operates at low
temperatures, both the value and ESR of the capacitor will
vary considerably. The capacitor manufacturer’s data sheet
provides this information.
A 300
mF tantalum capacitor will work for most
applications, but with high current regulators such as the
CS5257A−1 the transient response and stability improve
with higher values of capacitor. The majority of applications
for this regulator involve large changes in load current so the
output capacitor must supply the instantaneous load current.
The ESR of the output capacitor causes an immediate drop
in output voltage given by:
DV + DI
ESR
For microprocessor applications it is customary to use an
output capacitor network consisting of several tantalum and
ceramic capacitors in parallel. This reduces the overall ESR
and reduces the instantaneous output voltage drop under
transient load conditions. The output capacitor network
should be as close to the load as possible for the best results.
Protection Diodes
When large external capacitors are used with a linear
regulator it is sometimes necessary to add protection diodes.
If the input voltage of the regulator gets shorted, the output
capacitor will discharge into the output of the regulator. The
discharge current depends on the value of the capacitor, the
output voltage, and the rate at which VCONTROL drops. In
the CS5257A−1 regulator, the discharge path is through a
large junction and protection diodes are not usually needed.
If the regulator is used with large values of output
capacitance and the input voltage is instantaneously shorted
to ground, damage can occur. In this case, a diode connected
as shown in Figure 18 is recommended.
Figure 18. Diode Protection Against VCONTROL
Short Circuit Conditions
CS5257A−1
VCONTROL
VPOWER
VOUT
VSENSE
Adjust
Use of the diode has the added benefit of bleeding VOUT
to ground if VCONTROL is shorted. This prevents an
unregulated output from causing system damage.
A rule of thumb useful in determining if a protection diode
is required is to solve for current
I + C
V
T
where:
I is the current flow out of the load capacitance when
VCONTROL is shorted,
C is the value of load capacitance,
V is the output voltage, and
T is the time duration required for VCONTROL to transition
from high to being shorted.
If the calculated current is greater than or equal to the
typical short circuit current value provided in the
specifications, serious thought should be given to the use of
a protection diode.
Current Limit
The internal current limit circuit limits the output current
under excessive load conditions.
Short Circuit Protection
The device includes short circuit protection circuitry that
clamps the output current at approximately two amperes less
than its current limit value. This provides for a current
foldback function, which reduces power dissipation under a
direct shorted load.
Thermal Shutdown
The thermal shutdown circuitry is guaranteed by design to
activate above a die junction temperature of approximately
150°C and to shut down the regulator output. This circuitry
has 25°C of typical hysteresis, thereby allowing the
regulator to recover from a thermal fault automatically.
Calculating Power Dissipation and
Heat Sink Requirements
High power regulators such as the CS5257A−1 usually
operate at high junction temperatures. Therefore, it is
important to calculate the power dissipation and junction
temperatures accurately to ensure that an adequate heat sink
is used. Since the package tab is connected to VOUT on the
CS5257A−1, electrical isolation may be required for some
applications. Also, as with all high power packages, thermal
compound in necessary to ensure proper heat flow. For
added safety, this high current LDO includes an internal
thermal shutdown circuit.
The thermal characteristics of an IC depend on the
following four factors: junction temperature, ambient
temperature, die power dissipation, and the thermal
resistance from the die junction to ambient air. The
maximum junction temperature can be determined by:
TJ(max) + TA(max) ) PD(max)
RQJA
The maximum ambient temperature and the power
dissipation are determined by the design while the
maximum junction temperature and the thermal resistance
depend on the manufacturer and the package type. The
maximum power dissipation for a regulator is:


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