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參數(shù)資料
| 型號(hào)： | TK71133 |
| 廠商： | TOKO INC |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Cap-Free, NMOS, 150mA Low Dropout Regulator with Reverse Current Protection |
| 中文描述： | 3.3 V FIXED POSITIVE LDO REGULATOR, 0.2 V DROPOUT, PBCY3 |
| 封裝： | TO-92, 3 PIN |
| 文件頁(yè)數(shù)： | 15/16頁(yè) |
| 文件大?。?/td> | 87K |
| 代理商： | TK71133 |
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July 2000 TOKO, Inc.
Page 15
TK711xx
TERMS AND DEFINITIONS (CONT.)
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
)
INPUT/OUTPUT
CONSIDERATIONS
DECOUPLING
CAPACITOR
Voltage regulators require input and output decoupling
capacitors. The required value of these capacitors vary
with application. Capacitors made by different
manufacturers can have different characteristics,
particularly with regard to high frequencies and Equivalent
Series Resistance (ESR) over temperature. The type of
capacitor is also important. For example, a 4.7
μ
F aluminum
electrolytic may be required 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 designed 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 guarantee stability. Thus, it is
important to consider the characteristics of the capacitor
over temperature when selecting 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 aluminum electrolytic, but new low
ESR aluminum electrolytic capacitors are now available
from several manufacturers. Usually a bench test is
sufficient to determine the minimum capacitance required
for a particular application. After taking thermal
characteristics and tolerance into account, the minimum
capacitance value should be approximately two times this
value. The recommended minimum capacitance for the
TK711xxN is 2.1
μ
F for a tantalum capacitor or 3.3
μ
F for
an aluminum electrolytic. Please note that linear regulators
with a low dropout voltage have high internal loop gains
which require care in guarding against oscillation caused
by insufficient decoupling capacitance. The use of high
quality decoupling capacitors suited for your application
will guarantee proper operation of the circuit. Pay attention
to temperature characteristics of the capacitor, especially
the increase of ESR and decrease of capacitance in low
temperatures. Oscillation, reduction of ripple rejection and
increased noise may occur in some cases if the proper
capacitor is not used. An output capacitor more than 1.0
μ
F
is required to maintain stability. The standard test condition
is 3.3
μ
F (T
A
= 25
°
C).
PD
DPD
25
50
75
150
(mW)
TA (
°
C)
3
6
5
4
0
50
100
TA (
°
C)
P
150
0
600
1000
200
400
800
MOUNTED
TO-92 POWER DISSIPATION CURVE
APPLICATION INFORMATION
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TK71135 | Cap-Free, NMOS, 150mA Low Dropout Regulator with Reverse Current Protection |
| TK71140 | Cap-Free, NMOS, 150mA Low Dropout Regulator with Reverse Current Protection |
| TK71145 | Cap-Free, NMOS, 150mA Low Dropout Regulator with Reverse Current Protection |
| TK71220 | Cap-Free, NMOS, 150mA Low Dropout Regulator with Reverse Current Protection |
| TK71230MTL | Cap-Free, NMOS, 150mA Low Dropout Regulator with Reverse Current Protection |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TK71133NT | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:LOW DROPOUT REGULATOR |
| TK71133NT/133 | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:LOW DROPOUT REGULATOR |
| TK71135 | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:LOW DROPOUT REGULATOR |
| TK71135NT | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:LOW DROPOUT REGULATOR |
| TK71135NT/135 | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:LOW DROPOUT REGULATOR |
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