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參數(shù)資料
| 型號： | CS8121YTVA5 |
| 廠商： | ZF Electronics Corporation |
| 英文描述： | Multiconductor Cable; Number of Conductors:4; Conductor Size AWG:22; No. Strands x Strand Size:7 x 30; Jacket Material:Polypropylene; Number of Pairs:2; Features:Unshielded; Impedance:50ohm; Leaded Process Compatible:Yes RoHS Compliant: Yes |
| 中文描述： | 5V的，與第1A線性穩(wěn)壓器和啟用復(fù)位 |
| 文件頁數(shù)： | 7/8頁 |
| 文件大小： | 205K |
| 代理商： | CS8121YTVA5 |
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:
P
D(max)
=
{
V
IN(max)
- V
OUT(min)
}
I
OUT(max)
+ V
IN(max)
I
Q
(1)
where:
V
IN(max)
is the maximum input voltage,
V
OUT(min)
is the minimum output voltage,
I
OUT(max)
is the maximum output current for the applica-
tion, and
I
Q
is the quiescent current the regulator consumes at
I
OUT(max)
.
Once the value of P
D(max)
is known, the maximum permis-
sible value of R
Q
JA
can be calculated:
R
Q
JA
=
(2)
The value of R
JA
can then be compared with those in
the package section of the data sheet. Those packages
with R
JA
's less than the calculated value in equation 2
will keep the die temperature below 150C.
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 R
Q
JA
:
R
Q
JA
= R
Q
JC
+ R
Q
CS
+ R
Q
SA
(3)
where:
R
Q
JC
= the junctionDtoDcase thermal resistance,
R
Q
CS
= the caseDtoDheatsink thermal resistance, and
R
Q
SA
= the heatsinkDtoDambient thermal resistance.
R
Q
JC
appears in the package section of the data sheet. Like
R
JA
, it too is a function of package type. R
CS
and R
SA
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.
150C - T
A
P
D
7
Application Notes: continued
Calculating Power Dissipation
in a Single Output Linear Regulator
V
IN
Smart
Regulator
V
OUT
I
OUT
I
IN
I
Q
Control
Features
}
Figure 7: Single output regulator with key performance parameters
labeled.
C
RESET
V
OUT
R
RST
C
2
**
10
m
F
C
RST
ENABLE
V
IN
C
1
*
0.1
m
F
to
m
P
RESET
Port
5V to
m
P and
System
Power
CS-8121
C
1
*required if regulator is located far from
the power supply filter.
C
2
** required for stability.
Heat Sinks
Figure 6: Test and application circuit showing output compensation.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| CS8121YTHA5 | Hook-Up Wire; Conductor Size AWG:20; No. Strands x Strand Size:10 x 30; Jacket Color:Black; Approval Bodies:UL, CSA; Approval Categories:UL AWM Style 1015, CSA Type TEW, JQA-F-, Passes VW-1 Flame Test; Conductor Material:Copper RoHS Compliant: Yes |
| CS8121YTFVA5 | 5V, 1A Linear Regulator with and ENABLE RESET |
| CS8122YT5 | 2% 5V, 750mA Low Dropout Linear Regulator with Delayed RESET |
| CS8122 | 2% 5V, 750mA Low Dropout Linear Regulator with Delayed RESET |
| CS8122YTVA5 | Shielded Multiconductor Cable; Number of Conductors:4; Conductor Size AWG:22; No. Strands x Strand Size:7 x 30; Jacket Material:Polyethylene; Leaded Process Compatible:Yes; Temperature Max:60 C; Voltage Nom.:300V RoHS Compliant: Yes |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CS8122 | 制造商:CHERRY 制造商全稱:CHERRY 功能描述:2% 5V, 750mA Low Dropout Linear Regulator with Delayed RESET |
| CS-8122 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| CS8122/D | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:2% 5V， 750mA Low Dropout LinearRegulator with Delayed RESETbar |
| CS-8122T5 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Positive Fixed Voltage Regulator |
| CS-8122TH5 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Positive Fixed Voltage Regulator |
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