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CS8121 датащи(PDF) 7 Page - Cherry Semiconductor Corporation

номер детали CS8121
подробное описание детали  5V, 1A Linear Regulator with and ENABLE RESET
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производитель  CHERRY [Cherry Semiconductor Corporation]
домашняя страница  http://www.cherrycorp.com/
Logo CHERRY - Cherry Semiconductor Corporation

CS8121 датащи(HTML) 7 Page - Cherry Semiconductor Corporation

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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 temperatures. 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 7) is:
PD(max) = {VIN(max) - VOUT(min)}IOUT(max) + VIN(max)IQ
(1)
where:
VIN(max) is the maximum input voltage,
VOUT(min) is the minimum output voltage,
IOUT(max) is the maximum output current for the applica-
tion, and
IQ is the quiescent current the regulator consumes at
IOUT(max).
Once the value of PD(max) is known, the maximum permis-
sible value of RQJA can be calculated:
RQJA =
(2)
The value of RQJA can then be compared with those in
the package section of the data sheet. Those packages
with RQJA's less than the calculated value in equation 2
will keep the die temperature below 150¡C.
In some cases, none of the packages will be sufficient to
dissipate the heat generated by the IC, and an external
heatsink will be required.
A heat sink effectively increases the surface area of the
package to improve the flow of heat away from the IC
and into the surrounding air.
Each material in the heat flow path between the IC and
the outside environment will have a thermal resistance.
Like series electrical resistances, these resistances are
summed to determine the value of RQJA:
RQJA = RQJC + RQCS + RQSA
(3)
where:
RQJC = the junctionÐtoÐcase thermal resistance,
RQCS = the caseÐtoÐheatsink thermal resistance, and
RQSA = the heatsinkÐtoÐambient thermal resistance.
RQJC appears in the package section of the data sheet. Like
RQJA, it too is a function of package type. RQCS and RQSA
are functions of the package type, heatsink and the inter-
face between them. These values appear in heat sink data
sheets of heat sink manufacturers.
150¡C - T
A
PD
7
Application Notes: continued
Calculating Power Dissipation
in a Single Output Linear Regulator
VIN
Smart
Regulator
VOUT
IOUT
IIN
IQ
Control
Features
}
Figure 7: Single output regulator with key performance parameters
labeled.
RESET
VOUT
RRST
C2**
10
mF
CRST
ENABLE
VIN
C1*
0.1
mF
to
mP
RESET
Port
5V to
mP and
System
Power
CS-8121
C1*required if regulator is located far from
the power supply filter.
C2** required for stability.
Heat Sinks
Figure 6: Test and application circuit showing output compensation.


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