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參數(shù)資料
| 型號(hào)： | CS8156 |
| 廠商： | ZF Electronics Corporation |
| 英文描述： | 12V, 5V Low Dropout Dual Regulator with ENABLE |
| 中文描述： | 12V的，5V低壓降穩(wěn)壓器的雙用ENABLE |
| 文件頁(yè)數(shù)： | 7/8頁(yè) |
| 文件大小： | 172K |
| 代理商： | CS8156 |
7
Application Notes
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 output 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 capaci-
tor will usually cost less and occupy less board space. If
the output oscillates within the range of expected operat-
ing conditions, repeat steps 3 and 4 with the next larger
standard 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 for each output, 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
capacitors should be less than 50% of the maximum allow-
able ESR found in step 3 above.
Repeat steps 1 through 7 with C
3
, the capacitor on the
other output.
The maximum power dissipation for a dual output regula-
tor (Figure 1) is:
P
D(max)
= {V
IN(max)
DV
OUT1(min)
}I
OUT1(max)
+
{V
IN(max)
DV
OUT2(min)
}I
OUT2(max)
+V
IN(max)
I
Q
(1)
Where:
V
IN(max)
is the maximum input voltage,
V
OUT1(min)
is the minimum output voltage from V
OUT1
,
V
OUT2(min)
is the minimum output voltage fromV
OUT2
,
I
OUT1(max)
is the maximum output current for the appli-
cation,
I
OUT2(max)
is the maximum output current for the appli-
cation, 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)
Figure 1: Dual output regulator with key performance parameters
labeled.
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.
C1*
0.1
m
F
+
C2**
22
m
F
+
C3**
22
m
F
V
IN
ENABLE
V
OUT1
V
OUT2
Gnd
CS8156
Test & Application Circuit
Heat Sinks
V
IN
Smart
Regulator
V
OUT1
I
OUT1
I
IN
I
Q
Control
Features
}
V
OUT2
I
OUT2
150C - T
A
P
D
Calculating Power Dissipation
in a Dual Output Linear Regulator
NOTES:
* C
1
required if regulator is located far
from power supply filter.
** C
2
, C
3
required for stability.
C
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| CS8156YTVA5 | Shielded Paired Cable; Number of Conductors:2; Conductor Size AWG:22; No. Strands x Strand Size:7 x 30; Jacket Material:Polyvinylchloride (PVC); Shielding Material:Tinned Copper; Number of Pairs:1; Leaded Process Compatible:No RoHS Compliant: Yes |
| CS8156YTHA5 | Hook-Up Wire; Conductor Size AWG:22; No. Strands x Strand Size:7 x 30; Jacket Color:Red; 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 |
| CS8156YT5 | 12V, 5V Low Dropout Dual Regulator with ENABLE |
| CS8161 | 12V, 5V Low Dropout Dual Regulator with ENABLE |
| CS8161YTVA5 | Multiconductor Cable; Number of Conductors:2; Conductor Size AWG:22; No. Strands x Strand Size:7 x 30; Jacket Material:Polyvinylchloride (PVC); Number of Pairs:1; Leaded Process Compatible:No; Conductor Material:Copper RoHS Compliant: Yes |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CS-8156 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:12V 5V Low Dropout Dual Regulator with ENABLE |
| CS8156/D | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:12 V， 5.0 V Low Dropout Dual Regulator with ENABLE |
| CS-8156T | 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-8156T5 | 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-8156TH | 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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