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參數(shù)資料
| 型號： | TCL1585 |
| 廠商： | TelCom Semiconductor, Inc. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | 7A / 5A / 4.6A / 3A, FAST RESPONSE, LOW DROPOUT POSITIVE LINEAR VOLTAGE REGULATORS |
| 中文描述： | 第7A / 5A條/ 4.6a進(jìn)入/ 3A條，響應(yīng)速度快，低壓降線性穩(wěn)壓器陽性 |
| 文件頁數(shù)： | 8/13頁 |
| 文件大小： | 144K |
| 代理商： | TCL1585 |
TCL1584
TCL1585
TCL1587
7A / 5A / 4.6A / 3A, FAST RESPONSE,
LOW DROPOUT POSITIVE LINEAR
VOLTAGE REGULATORS
PRELIMINARY INFORMATION
8
TCL1584/1585/1587-04 6/6/97
When generating the overall thermal design, it is impor-
tant to consider all sources of thermal resistance between
the silicon die and ambient - junction-to-case (
Θ
JC
), case-to-
heat sink (
Θ
CH
), heat sink-to-ambient (
Θ
HA
). NOTE: there
are two separate
Θ
JC
specifications for the power transistor
and the control circuitry. Both junction temperatures must be
calculated and kept under each respective maximum limit to
ensure proper operation. This
Θ
JC
is for the physical path
between the die and the bottom metal portion of the case
(both TO-220 and DDPAK-3. Heat flow will be greatest
through this path. It is important that good thermal coupling
is made between the case and heat sink. If electrical
isolation from the heat sink is not required, it is recom-
mended that thermally conductive compound be used.
Otherwise, use a thermally conductive dielectric spacer.
The following is a thermal design example:
Using a TCL1585-3.3 in a TO-220 package:
Assumptions:
T
A
= +70
°
C
V
IN
= 5.25V (5V + 5%)
V
OUT
= 3.30V
I
OUT
= 4.6A
Θ
HA
= 3.5
°
C/W (heat sink-to-ambient)
Θ
CH
= 1.5
°
C/W (case-to-heat sink)
Θ
JC
= 3
°
C/W (power transistor)
Θ
JC
= 0.7
°
C/W (control circuitry)
Power dissipation:
P
D
= (V
IN
– V
OUT
)(I
OUT
) = (5.25 – 3.3)(4.6) = 8.97W
Junction Temperatures:
T
J
= T
A
+ P
D
(
Θ
HA
+
Θ
CH
+
Θ
JC
)
Control Circuitry:
T
J
= 70 + 8.97(3.5 + 1.5 + 0.7) = 121.1
°
C
Power Transistor:
T
J
= 70 + 8.97(3.5 + 1.5 + 3) = 141.8
°
C
These values for T
J
fall within the maximum allowed
junction temperature for each die section indicating ad-
equate heat sinking with some margin.
NOTE:
Without heat sinking, the thermal resistance for the
TO-220 and DDPAK-3 packages are 53
°
C/W and
76
°
C/W respectively.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TCL1585-3.3CAB | 7A / 5A / 4.6A / 3A, FAST RESPONSE, LOW DROPOUT POSITIVE LINEAR VOLTAGE REGULATORS |
| TCL1585-3.3CEB | 7A / 5A / 4.6A / 3A, FAST RESPONSE, LOW DROPOUT POSITIVE LINEAR VOLTAGE REGULATORS |
| TCL1587 | 7A / 5A / 4.6A / 3A, FAST RESPONSE, LOW DROPOUT POSITIVE LINEAR VOLTAGE REGULATORS |
| TCL1587-3.3CAB | 7A / 5A / 4.6A / 3A, FAST RESPONSE, LOW DROPOUT POSITIVE LINEAR VOLTAGE REGULATORS |
| TCL1587-3.3CEB | 7A / 5A / 4.6A / 3A, FAST RESPONSE, LOW DROPOUT POSITIVE LINEAR VOLTAGE REGULATORS |
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