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參數(shù)資料
| 型號(hào)： | TPS72216DBVR |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | LOW INPUT VOLTAGE, CAP FREE 50-mA LOW-DROPOUT LINEAR REGULATORS |
| 中文描述： | 低輸入電壓，第免費(fèi)50毫安低壓降線性穩(wěn)壓器 |
| 文件頁(yè)數(shù)： | 9/11頁(yè) |
| 文件大?。?/td> | 119K |
| 代理商： | TPS72216DBVR |
TPS72201, TPS72215
TPS72216, TPS72218
SLVS390B
–
DECEMBER 2001
–
REVISED MAY 2002
www.ti.com
9
PROGRAMMING THE TPS72201 ADJUSTABLE LDO REGULATOR
The output voltage of the TPS72201 adjustable regulator is programmed using an external resistor divider as shown in
Figure 18. The output voltage is calculated using:
VO
Vref
1
R1
R2
(1)
Where:
V
ref
= 1.225 V typ (the internal reference voltage)
Resistors R1 and R2 should be chosen for approximately 10-
μ
A divider current. Lower value resistors can be used but offer
no inherent advantage and waste more power. Higher values should be avoided, as leakage currents at FB increase the
output
voltage
error.
The
recommended
R2 = 121 k
to set the divider current at 10
μ
A and then calculate R1 using:
design
procedure
is
to
choose
R1
VO
Vref
1
R2
(2)
Where:
V
ref
= 1.225
VO
VI
OUT
FB
R2
GND
EN
IN
≤
0.9 V
≥
1.7 V
TPS72201
1% values shown.
3
1
4
2
R1
5
0.1
μ
F
OUTPUT
VOLTAGE
(V)
R1
R2
2.5
3.3
127
205
121
121
OUTPUT VOLTAGE
PROGRAMMING GUIDE
DIVIDER RESISTANCE
(k
)
0.1
μ
F
Figure 18. TPS72201 Adjustable LDO Regulator Programming
REGULATOR PROTECTION
The TPS722xx pass element has a built-in back diode that safely conducts reverse current when the input voltage drops
below the output voltage (e.g., during power down). Current is conducted from the output to the input and is not internally
limited. If extended reverse voltage is anticipated, external limiting might be appropriate.
The TPS722xx also features internal current limiting and thermal protection. During normal operation, the TPS722xx limits
output current to approximately 350 mA. When current limiting engages, the output voltage scales back linearly until the
overcurrent condition ends. While current limiting is designed to prevent gross device failure, care should be taken not to
exceed the power dissipation ratings of the package. If the temperature of the device exceeds 170
°
C, thermal-protection
circuitry shuts it down. Once the device has cooled down to below 150
°
C, regulator operation resumes.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS72216DBVRG4 | 功能描述:低壓差穩(wěn)壓器 - LDO Low-Noise Low Input Voltage 50mA RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TPS72216DBVT | 功能描述:低壓差穩(wěn)壓器 - LDO Low-Noise Low Input Voltage 50mA RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TPS72216DBVTG4 | 功能描述:低壓差穩(wěn)壓器 - LDO Low-Noise Low Input Voltage 50mA RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TPS72218DBVR | 功能描述:低壓差穩(wěn)壓器 - LDO Low-Noise Low Input Voltage 50mA RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TPS72218DBVRG4 | 功能描述:低壓差穩(wěn)壓器 - LDO Low-Noise Low Input Voltage 50mA RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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