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參數(shù)資料
| 型號： | TK11240A |
| 廠商： | TOKO Inc. |
| 英文描述： | VOLTAGE REGULATOR WITH ON/OFF SWITCH |
| 中文描述： | 調(diào)壓器ON / OFF開關 |
| 文件頁數(shù)： | 31/34頁 |
| 文件大?。?/td> | 382K |
| 代理商： | TK11240A |
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Page 31
January, 1996 TOKO, Inc.
1-4-96
TK112xxA
0
50
100
TA (°C)
0
PD
1000
2000
24
150
Glass Epoxy
Circuit Board
10 X 10 mm
Ceramc Substrate
25 X 30 mm
Unmounted
Mounted
as shown
SOT-89-5 Power Dissipation Curve
Copper pattern should be as large as possible. Power
dissipation is 400 mW for SOT-23L and 800 mV for SOT-
89-5. A low ESR capacitor is recommended. For low
temperature operation, select a capacitor with a low ESR at
the lowest operating temperature to prevent oscillation,
degradation of ripple rejection and increase in noise. The
minimum recommended capacitance is 2.2
μ
F.
INPUT/OUTPUT DECOUPLING CAPACITOR CONSIDER-
ATIONS
Voltage regulators require input and output decoupling
capacitors. The required value of these capacitors vary
with application. Capacitors made by different manufactur-
ers can have different characteristics, particularly with
regard to high frequencies and equivalent resistance (ESR)
over temperature. The type of capacitor is also important.
For example, a 4.7
μ
F aluminum electrolytic may be re-
quired for a certain application. If a tantalum capacitor is
used, a lower value of 2.2
μ
F would be adequate. It is
important to consider the temperature characteristics of the
decoupling capacitors. While Toko regulators are de-
signed to operate as low as -40
°
C, many capacitors will not
operate properly at this temperature. The capacitance of
aluminum electrolytic capacitors may decrease to 0 at low
temperatures. This may cause oscillation on the output of
the regulator since some capacitance is required to guar-
antee stability. Thus, it is important to consider the charac-
teristics of the capacitor over temperature when selection
decoupling capacitors. The ESR is another important
parameter. The ESR will increase with temperature but low
ESR capacitors are often larger and more costly. In
general, Tantalum capacitors offer lower ESR than alumi-
num electrolytic, but new low ESR aluminum electrolytic
DEFINITION AND EXPLANATION OF TECHNICAL TERMS (CONT.)
5.) In design, take a vertical line from the maximum
operating temperature (e.g. 75
°
C) to the derating
curve.
6.) 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
.
The maximum operating current is:
I
OUT
= (D
PD
/(V
IN(MAX)
-
V
OUT
).
+
A
+
A
GND
ON/OFF
VIN
VO
SOT-23L Board Layout
0
50
100
TA (°C)
0
PD
300
500
23
150
Mounted as shown
Unmounted
400
200
100
SOT-23L Power Dissipation Curve
+
A
+
A
ON/OFF
VIN
VO
SOT-89-5 Board Layout
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相關代理商/技術參數(shù) |
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|---|---|
| TK11240AMBX | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:VOLTAGE REGULATOR WITH ON/OFF SWITCH |
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| TK11240AMTL | 制造商:TOKO Inc 功能描述: |
| TK11240AUBX | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:VOLTAGE REGULATOR WITH ON/OFF SWITCH |
| TK11240AUTB | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:VOLTAGE REGULATOR WITH ON/OFF SWITCH |
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