CS8101 Cherry Semiconductor Corporation, CS8101 Datasheet - Page 5

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CS8101

Manufacturer Part Number
CS8101
Description
Micropower 5V/ 100mA Low Dropout Linear Regulator with RESET and ENABLE
Manufacturer
Cherry Semiconductor Corporation
Datasheet

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The I/O port of the microprocessor typically provides
50µA to Q1. In automotive applications the SWITCH is
connected to the ignition switch.
The output or compensation capacitor helps determine
three main characteristics of a linear regulator: start-up
delay, load transient response and loop stability.
Figure 5. Test and application circuit showing output compensation.
The capacitor value and type should be based on cost,
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 instabili-
ty. The aluminum electrolytic capacitor is the least expen-
sive solution, but, if the circuit operates at low tempera-
tures (-25¡C to -40¡C), both the value and ESR of the
capacitor will vary considerably. The capacitor manufac-
turers data sheet usually provides this information.
The value for the output capacitor C
should work for most applications, however it is not nec-
essarily the optimized solution.
To determine an acceptable value for C
application, start with a tantalum capacitor of the recom-
mended value and work towards a less expensive alterna-
tive part.
Step 1: Place the completed circuit with a tantalum capac-
itor of the recommended value in an environmental cham-
ber 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.
Step 2: With the input voltage at its maximum value,
** C
Microprocessor
*C
temperature expected.
IN
OUT
I/O drive
ON
OFF
V
required if regulator is located far from the power supply filter.
IN
required for stability. Capacitor must operate at minimum
0.1mF
C
IN
Table 1. Logic Control of CS8101 Output
*
Stability Considerations
ENABLE
Switch
Closed
Closed
Open
Open
CS8101
RESET
ENABLE
V
OUT
HIGH
LOW
LOW
LOW
OUT
OUT
shown in Figure 5
R
RST
for a particular
Application Notes: continued
Output
OFF
ON
ON
ON
C
10mF
OUT **
5
increase the load current slowly from zero to full load
while observing the output for any oscillations. If no oscil-
lations are observed, the capacitor is large enough to
ensure a stable design under steady state conditions.
Step 3: Increase the ESR of the capacitor from zero using
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 4: Maintain the worst case load conditions set in step
3 and vary the input voltage until the oscillations increase.
This point represents the worst case input voltage conditions.
Step 5: If the capacitor is adequate, repeat steps 3 and 4
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 stan-
dard capacitor value.
Step 6: Test the load transient response by switching in
various loads at several frequencies to simulate its real
working environment. Vary the ESR to reduce ringing.
Step 7: Remove the unit from the environmental chamber
and heat the IC with a heat gun. Vary the load current as
instructed in step 5 to test for any oscillations.
Once the minimum capacitor value with the maximum
ESR is found, a safety factor should be added to allow for
the tolerance of the capacitor and any variations in regula-
tor 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 tem-
peratures. The ESR of the capacitor should be less than
50% of the maximum allowable ESR found in step 3 above.
The maximum power dissipation for a single output regu-
lator (Figure 6) is:
where:
Once the value of P
sible value of R
The value of R
the package section of the data sheet. Those packages with
R
the die temperature below 150¡C.
QJA
V
V
I
tion, and
I
I
OUT(max)
Q
OUT(max)
P
IN(max)
OUT(min)
D(max)
's less than the calculated value in equation 2 will keep
is the quiescent current the regulator consumes at
= { V
is the maximum input voltage,
.
in a Single Output Linear Regulator
is the maximum output current for the applica-
is the minimum output voltage,
Calculating Power Dissipation
IN(max)
QJA
QJA
can then be compared with those in
R
can be calculated:
D(max)
QJA
- V
OUT(min)
=
is known, the maximum permis-
150¡C - T
P
} I
D
OUT(max)
A
+ V
IN(max)
I
Q
(1)
(2)

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