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| 型號(hào)： | TK635STL |
| 廠商： | TOKO Inc. |
| 英文描述： | CMOS LDO REGULATOR WITH HIGH ACTIVE CONTROL ADVANCED |
| 中文描述： | CMOS LDO穩(wěn)壓器具有高先進(jìn)的主動(dòng)控制 |
| 文件頁(yè)數(shù)： | 4/6頁(yè) |
| 文件大小： | 35K |
| 代理商： | TK635STL |
Page 4
February 1999 TOKO, Inc.
ADVANCED INFORMATION
DEFINITION AND EXPLANATION OF TECHNICAL TERMS (CONT.)
P
D
is the value when the thermal protection circuit is
activated. A simple way to determine P
D
is to calculate V
IN
x I
IN
when the output side is shorted. Input current gradually
falls as temperature rises. You should use the value when
thermal equilibrium is reached.
The range of usable currents can also be found from the
graph below.
Procedure:
1)
2)
3)
4)
Find P
D
P
D1
is taken to be P
D
x (~0.8 - 0.9)
Plot P
D1
against 25
°
C
Connect P
D1
to the point corresponding to the 150
°
C
with a straight line.
In design, take a vertical line from the maximum
operating temperature (e.g., 75
°
C) to the derating
curve.
Read off the value of P
D
against the point at which the
vertical line intersects the derating curve. This is taken
as the maximum power dissipation, D
PD
.
5)
6)
The maximum operating current is:
I
OUT
= (D
PD
/ (V
IN(MAX)
-
V
OUT
)
SOT-23-5 POWER DISSIPATION CURVE
PD
DPD
25
50
75
150
(mW)
TA (
°
C)
3
6
5
4
0 50 100 150
TA (
°
C)
P
0
100
500
MOUNTED AS
SHOWN
FREE AIR
200
300
400
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