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CS5204-3 Datasheet(PDF) 6 Page - ON Semiconductor

No. de pieza CS5204-3
Descripción Electrónicos  4.0 A Adjustable, and 3.3 V and 5.0 V Fixed Linear Regulators
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Fabricante Electrónico  ONSEMI [ON Semiconductor]
Página de inicio  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

CS5204-3 Datasheet(HTML) 6 Page - ON Semiconductor

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CS5204−1, CS5204−3, CS5204−5
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6
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
load transient conditions. The output capacitor network
should be as close as possible to the load 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 VIN drops. In the
CS5204−x family of linear regulators, 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 Figures 11 and 12 is recommended.
Figure 11. Protection Diode Scheme for Adjustable
Output Regulator
C2
VOUT
VIN
C1
VIN
VOUT
Adj
CS5204−1
IN4002 (optional)
CAdj
R1
R2
Figure 12. Protection Diode Scheme for Fixed Output
Regulators
C2
VOUT
VIN
C1
VIN
VOUT
GND
CS5204−x
IN4002 (optional)
Output Voltage Sensing
Since the CS5204−x is a three terminal regulator, it is not
possible to provide true remote load sensing. Load
regulation is limited by the resistance of the conductors
connecting the regulator to the load. For best results the
fixed regulators should be connected as shown in Figure 13.
Figure 13. Conductor Parasitic Resistance can be
Minimized with the Above Grounding Scheme for
Fixed Output Regulators
VIN
VIN
VOUT
GND
CS5204−x
Conductor Parasitic
Resistance
RC
RLOAD
For the adjustable regulator, the best load regulation
occurs when R1 is connected directly to the output pin of the
regulator as shown in Figure 14. If R1 is connected to the
load, RC is multiplied by the divider ratio and the effective
resistance between the regulator and the load becomes
RC
R1
) R2
R1
where RC = conductor parasitic resistance.
Figure 14. Grounding Scheme for Adjustable Output
Regulator to Minimize Parasitics
VIN
VIN
VOUT
Adj
CS5204−1
Conductor Parasitic
Resistance
R1
RLOAD
R2
RC


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