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參數(shù)資料
| 型號： | TK11927 |
| 廠商： | TOKO Inc. |
| 英文描述： | VOLTAGE REGULATOR WITH RESET OUTPUT |
| 中文描述： | 調(diào)壓器RESET輸出 |
| 文件頁數(shù)： | 21/23頁 |
| 文件大?。?/td> | 134K |
| 代理商： | TK11927 |
January 1999 TOKO, Inc.
Page 21
TK119xx
VMAX
VMIN
RMAX
RMIN
SOT-23L BOARD LAYOUT
NOISE BYPASS CAPACITOR SECTION
The noise bypass capacitor (C
N
) should be connected as
close as possible to pin 1 and ground. The recommended
value for C
N
is 0.01
μ
F. The noise bypass terminal has a
high impedance and care should be taken if the noise
bypass capacitor is not used. This terminal is susceptible
to external noise, and oscillation can occur when C
N
is not
used and the solder pad for this pin is too large.
RESET OUTPUT CONSIDERATIONS
It is important to note the accuracy of the regulator and
voltage detector functions when they are combined within
one IC. The figure below illustrates the voltage regulator
and voltage detector implemented with individual reference
voltages.
NON-TOKO APPROACH
INPUT/OUTPUT
CONSIDERATIONS
DECOUPLING
CAPACITOR
Voltage regulators require input and output decoupling
capacitors. The required values 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 -30
°
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 the
value. The recommended minimum capacitance for the
TK119xx is 2.2
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.
BOARD LAYOUT
Copper pattern should be as large as possible. Power
dissipation is 400 mW for the SOT-23L package. 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.
GND
VIN
VOUT
CONTROL
RESET
+
+
GND
APPLICATION INFORMATION
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