cs5205-2 ON Semiconductor, cs5205-2 Datasheet - Page 4

• Manufacturer Part Number: cs5205-2
• Description: 5.0 A, 1.5 V Fixed Linear Regulator
• Manufacturer: ON Semiconductor

includes thermal shutdown and safe area protection (SOA)
circuitry. The SOA protection circuitry decreases the
maximum available output current as the input−output
differential voltage increase.
transistor and requires an output capacitor for stability. A
detailed procedure for selecting this capacitor is included in
the Stability Considerations section.
Stability Considerations
three main characteristics of a linear regulator: start−up
delay, load transient response, and loop stability.
size and temperature constraints. A tantalum or aluminum
electrolytic capacitor is best, since a film or ceramic
capacitor with almost zero ESR can cause instability. The
aluminum electrolytic capacitor is the least expensive
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.
applications, but with high current regulators such as the
CS5205−2 the transient response and stability improve with
higher values of capacitance. 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:
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.
The regulator is protected against short circuit, and
The CS5205−2 has a composite PNP−NPN output
The output or compensation capacitor helps determine
The capacitor value and type is based on cost, availability,
A 22 mF tantalum capacitor will work for most
For microprocessor applications it is customary to use an
DV + DI
ESR
APPLICATIONS INFORMATION
http://onsemi.com
CS5205−2
4
Protection Diodes
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 V
CS5205−2 linear 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 7 is recommended.
Output Voltage Sensing
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
regulator should be connected as shown in Figure 8.
V
IN
When large external capacitors are used with a linear
Since the CS5205−2 is a three terminal regulator, it is not
Figure 8. Conductor Parasitic Resistance Effects
Can Be Minimized With the Above Grounding
Figure 7. Protection Diode Scheme for Fixed
V
IN
Scheme for Fixed Output Regulators
V
IN
CS5205−2
C
1
Output Regulators
IN4002 (Optional)
V
V
OUT
IN
CS5205−2
GND
V
OUT
R
C
Conductor Parasitic
IN
Resistance
drops. In the
C
V
2
OUT
R
LOAD