CS8122YTVA5 ON Semiconductor, CS8122YTVA5 Datasheet - Page 7

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CS8122YTVA5

Manufacturer Part Number
CS8122YTVA5
Description
IC REG LDO LIN 750MA 5V TO220-5
Manufacturer
ON Semiconductor
Datasheet

Specifications of CS8122YTVA5

Regulator Topology
Positive Fixed
Voltage - Output
5V
Voltage - Input
6 ~ 26 V
Voltage - Dropout (typical)
0.35V @ 500mA
Number Of Regulators
1
Current - Output
500mA
Current - Limit (min)
750mA
Operating Temperature
-40°C ~ 125°C
Mounting Type
Through Hole
Package / Case
TO-220-5 (Bent and Staggered Leads)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
CS8122YTVA5OS

Available stocks

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Part Number:
CS8122YTVA5
Manufacturer:
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Quantity:
20 000
determine three main characteristics of a linear regulator:
start−up delay, load transient response and loop stability.
availability, 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, but, if the circuit operates at low
temperatures (−25°C to −40°C), both the value and ESR of
the capacitor will vary considerably. The capacitor
manufacturers data sheet usually provides this information.
13 should work for most applications, however it is not
necessarily the optimized solution.
application, start with a tantalum capacitor of the
recommended value and work towards a less expensive
alternative part.
capacitor of the recommended value in an environmental
chamber at the lowest specified operating temperature and
monitor the outputs with an oscilloscope. A decade box
connected in series with the capacitor will simulate the
higher ESR of an aluminum capacitor. Leave the decade box
outside the chamber, the small resistance added by the
longer leads is negligible.
increase the load current slowly from zero to full load while
observing the output for any oscillations. If no oscillations
are observed, the capacitor is large enough to ensure a stable
design under steady state conditions.
the decade box and vary the load current until oscillations
appear. Record the values of load current and ESR that cause
the greatest oscillation. This represents the worst case load
conditions for the regulator at low temperature.
step 3 and vary the input voltage until the oscillations
increase. This point represents the worst case input voltage
conditions.
with the next smaller valued capacitor. A smaller capacitor
will usually cost less and occupy less board space. If the
output oscillates within the range of expected operating
conditions, repeat steps 3 and 4 with the next larger standard
capacitor value.
various loads at several frequencies to simulate its real
working environment. Vary the ESR to reduce ringing.
operating temperature. Vary the load current as instructed in
step 5 to test for any oscillations.
The output or compensation capacitor, C
The capacitor value and type should be based on cost,
The value for the output capacitor C
To determine an acceptable value for C
Step 1: Place the completed circuit with a tantalum
Step 2: With the input voltage at its maximum value,
Step 3: Increase the ESR of the capacitor from zero using
Step 4: Maintain the worst case load conditions set in
Step 5: If the capacitor is adequate, repeat steps 3 and 4
Step 6: Test the load transient response by switching in
Step 7: Raise the temperature to the highest specified
STABILITY CONSIDERATIONS
OUT
OUT
shown in Figure
for a particular
OUT
APPLICATION NOTES
, helps
http://onsemi.com
CS8122
7
ESR is found, a safety factor should be added to allow for the
tolerance of the capacitor and any variations in regulator
performance. Most good quality aluminum electrolytic
capacitors have a tolerance of ± 20% so the minimum value
found should be increased by at least 50% to allow for this
tolerance plus the variation which will occur at low
temperatures. The ESR of the capacitor should be less than
50% of the maximum allowable ESR found in step 3 above.
regulator (Figure 14) is:
P D(max) + V IN(max) * V OUT(min) I OUT(max) ) V IN(max) I Q
where:
permissible value of R
package section of the data sheet. Those packages with
R
the die temperature below 150°C.
dissipate the heat generated by the IC, and an external
heatsink will be required.
qJA
Once the minimum capacitor value with the maximum
The maximum power dissipation for a single output
V
V
I
I
Once the value of P
The value of R
In some cases, none of the packages will be sufficient to
V
CALCULATING POWER DISSIPATION IN A SINGLE
OUT(max)
Q
IN
IN(max)
OUT(min)
application, and
I
’s less than the calculated value in equation 2 will keep
is the quiescent current the regulator consumes at
OUT(max)
Figure 14. Single Output Regulator With Key
Performance Parameters Labeled
I
is the maximum input voltage,
IN
is the maximum output current for the
OUTPUT LINEAR REGULATOR
is the minimum output voltage,
.
qJA
R qJA +
can then be compared with those in the
REGULATOR
qJA
D(max)
SMART
Control
Features
can be calculated:
150°C * T A
P D
I
is known, the maximum
Q
®
I
OUT
V
OUT
(2)
(1)

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