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參數(shù)資料
| 型號： | L7980A |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 3.5 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | ROHS COMPLIANT, HSOP-8 |
| 文件頁數(shù)： | 32/44頁 |
| 文件大?。?/td> | 1247K |
| 代理商： | L7980A |
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Application ideas
L7980
38/44
Doc ID 15181 Rev 3
As in the positive one, in the inverting buck-boost the current flowing through the power
MOSFET is transferred to the load only during the OFF time. So according to the maximum
DC switch current (2.0 A), the maximum output current can be calculated from the Equation
35, where the duty cycle is given by Equation 39.
Figure 35.
Inverting buck-boost regulator
The GND pin of the device is connected to the output voltage so, given the output voltage,
input voltage range is limited by the maximum voltage the device can withstand across VCC
and GND (28 V). Thus if the output is -5 V the input voltage can range from 4.5 V to 23 V.
As in the positive buck-boost, the maximum output current according to application
conditions is shown in Figure 36. The dashed line considers a more accurate estimation of
the duty cycles given by Equation 40, where power losses across diodes and internal power
MOSFET are taken into account.
Equation 40
Figure 36.
Maximum output current according to max DC switch current (2.0 A):
VO=-5 V
D
V
OUT
V
D
–
V
–
IN
V
SW
V
OUT
V
D
–
+
–
-----------------------------------------------------------------
=
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L7980ATR | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 2 A Step-Down Reg 4.5V to 28V 250 kHz RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| L7980TR | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 2A DC 4.5 V to 28 V Adj 0.6V 250 kHz RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| L7981 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 3A Step-Down Reg 3A DC 4.5-28V 250Khz RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| L7981A | 制造商:STMicroelectronics 功能描述:POWER CONVERSION - Rail/Tube 制造商:STMicroelectronics 功能描述:3A Step-Down Reg 3.7A 4.5 to 28V 1MHz 制造商:ST 功能描述:3A STEP-DOWN SWITCHING REGULATOR |
| L7981ATR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 3 A Step-Down Reg 4.5V to 28V 250 kHz RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
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