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參數(shù)資料
| 型號： | TK715XX |
| 廠商： | TOKO Inc. |
| 元件分類： | 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 |
| 文件頁數(shù)： | 12/13頁 |
| 文件大小： | 76K |
| 代理商： | TK715XX |
Page 12
January 1999 TOKO, Inc.
TK715xx
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 TK715xx. The high output voltage
accuracy is maintained because the diode forward voltage
variations over temperature and load current have been
eliminated.
PARALLEL OPERATION
The series resistor R is put in the input line of the low output
voltage regulator in order to prevent overdissipation. The
voltage dropped across the resistor reduces the large
input-to-output voltage across the regulator, reducing the
power dissipation in the device.
715xxS
VOUT
VIN
GND
APPLICATION INFORMATION (CONT.)
SWITCHING OPERATION
Even though the input voltages or the output voltages are
different, the outputs of the TK715xx regulators can be
connected together, and the output voltages switched. If
two or more TK715xx regulators are turned ON
simultaneously, the highest output voltage will be present.
CURRENT BOOST OPERATION
The output current can be increased by connecting an
external PNP transistor as shown below. The output
current capability depends upon the H
fe
of the external
transistor. Note: The TK715xx internal short circuit
protection and thermal sensor do not protect the external
transistor.
TK715xxS
VOUT
VIN
TK71550
5 V
VIN
TK71530
TK71520
3 V
2 V
R
TK715xx
VIN
VOUT
0.22 μF
150
VIN
3.3 μF
TK71530
VIN
TK71528
VIN
3.0VOUT
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