參數(shù)資料
型號(hào)： TK71634ASCL
廠(chǎng)商： TOKO Inc.
元件分類(lèi)： 基準(zhǔn)電壓源/電流源
英文描述： LOW DROPOUT VOLTAGE REGULATOR
中文描述： 低壓差穩(wěn)壓器
文件頁(yè)數(shù)： 17/20頁(yè)
文件大?。?/td> 111K
代理商： TK71634ASCL
December 1999 TOKO, Inc.
Page 17
TK716xx
REVERSE BIAS PROTECTION
The internal reverse bias protection eliminates the
requirement for a reverse voltage protection diode. This
saves both cost and board space.
Another reverse bias protection technique is illustrated
below. The extra diode and extra capacitor are not
necessary with the TK716xx. The high output voltage
accuracy is maintained because the diode forward voltage
variations over temperature and load current have been
eliminated.
HIGH-SIDE SWITCHING
High-side switching should not be implemented by an
external transistor as shown below. This results in additional
voltage drop and loss of accuracy.
TK716xxS
VOUT
VIN
GND
APPLICATION INFORMATION (CONT.)
The high output voltage accuracy and low dropout voltage
are maintained when the IC is turned ON/OFF by using the
control pin as illustrated below.
High-side switching with a FET is illustrated below. Battery
life is extended by the dropout voltage of the FET when the
input of the TK716xx is connected in front of the FET
switch.
VOLTAGE BACKUP OPERATION (HOLDUP TIME
)
C
L
becomes the backup power supply when the
microprocessor is reset with the voltage detector IC
simultaneously with the turning OFF the TK716xx. C
L
provides the holdup time necessary to do an orderly
shutdown of the microprocessor.
TK716xxS
VOUT
VIN
ON/OFF
VOUT
RVOLTAGE
VDROP
TK716xxS
VOUT
VIN
GND
μ PRO
VCONT
VIN
TK716xxS
VOUT
VIN
GND
DVOLTAGE
VCONT OFF
μ PRO
RESET
CL
716xx
VOUT
VIN
VCONT
FET SWITCHING OUTPUT
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