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參數(shù)資料
| 型號(hào)： | L7980 |
| 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： | 3 X 3 MM, 1.08 MM HEIGHT, ROHS COMPLIANT, VFQFPN-8 |
| 文件頁數(shù)： | 15/44頁 |
| 文件大小： | 1247K |
| 代理商： | L7980 |
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Application informations
L7980
22/44
Doc ID 15181 Rev 3
Equation 21
where K is the feed forward constant and 1/K is equals to 9.
3.
Calculate C4 by placing the zero at 50% of the output filter double pole frequency (fLC):
Equation 22
4.
Calculate C5 by placing the second pole at four times the system bandwidth (BW):
Equation 23
5.
Set also the first pole at four times the system bandwidth and also the second zero at
the output filter double pole:
Equation 24
The suggested maximum system bandwidth is equals to the switching frequency divided by
3.5 (FSW/3.5), anyway lower than 100 kHz if the FSW is set higher than 500 kHz.
For example with VOUT=5 V, VIN=24 V, IO=2 A, L=27 μH, COUT=22 μF, ESR<1 mΩ, the type
III compensation network is:
In Figure 12 is shown the module and phase of the open loop gain. The bandwidth is about
54 kHz and the phase margin is 50°.
R
4
BW
f
LC
---------- KR
1
=
C
4
1
π R
4
f
LC
---------------------------
=
C
5
C
4
2
π R
4
C
4
4BW
1
–
--------------------------------------------------------------
=
R
3
R
1
4BW
f
LC
-----------------
1
–
---------------------------
=
C
3
1
2
π R
3
4BW
-----------------------------------------
=
,
R
1
4.99k
Ω
=
R
2
680
Ω
=
R
3
150
Ω
=
R
4
3.3k
Ω
=
C
3
4.7nF
=
C
4
22nF
=
C
5
220pF
=
,,
,
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L7980A | 制造商:STMicroelectronics 功能描述:Conv DC-DC Single Step Down 4.5V to 28V 8-Pin HSOP EP Tube 制造商:STMicroelectronics 功能描述:POWER CONVERSION - Rail/Tube 制造商:STMicroelectronics 功能描述:2A Step-Down Reg 2.5A 4.5 28V 250kHz 制造商:STMicroelectronics 功能描述:BUCK, 4.5-28V, 2A, 1MHZ, 0.6-28V, 8HSOP; Primary Input Voltage:28V; No. of Outputs:1; Output Current:2A; Voltage Regulator Case Style:HSOP; No. of Pins:8; Operating Temperature Min:-25C; Operating Temperature Max:125C; MSL:MSL 3 - ;RoHS Compliant: Yes 制造商:ST 功能描述:0 |
| 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(fēng)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(fēng)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(fēng)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 |
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