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| 型號： | L6911E |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.3 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | SO-20 |
| 文件頁數(shù)： | 18/34頁 |
| 文件大?。?/td> | 558K |
| 代理商： | L6911E |
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L6911E
VRM demo board description
25/34
6.1
Efficiency
The measured efficiency versus load current at different output voltages is shown in
Figure 13. In the application two Mosfets STS12NF30L (30V, 8.5m
typ with V
GS = 12V)
connected in parallel are used for the High Side, while three of them are used for the Low
Side.
Figure 13. Efficiency vs. load current
6.2
Inductor design
Since the maximum output current is 28.5A, to have a 20% ripple (5A) the inductor chosen
is 1.5
H.
6.3
Output capacitor
In the demo six OSCON capacitors, model 6SP680M, are used, with a maximum ESR equal
to 12m
each. Therefore the resultant ESR is of 2m. For load transient of 28.5A in the
worst case the voltage drop is of:
Equation 24
The voltage drop due to the capacitor discharge during load transient, considering that the
maximum duty cicle is equal to 100% results in 46.5mV with 1.85V of programmed output.
40
50
60
70
80
90
0
5
10
15
20
25
Output Current [A]
E
ffi
ci
ency
[%]
Vout = 1.825V
Vout = 1.225V
Vout = 1.500V
Vout = 28.5 * 0.002 = 57mV
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L6911E_07 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5-Bit programmable step down controller with synchronous rectification |
| L6911ETR | 功能描述:DC/DC 開關(guān)控制器 5B PROGRAMMABLE STEP DOWN CONTROLLER RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| L6912-2 | 制造商:Thomas & Betts 功能描述:1/2 CORD GRIP CONNECTOR,2/BG |
| L6913-1 | 制造商:Thomas & Betts 功能描述:1/2 CORD GRIP CONNECTOR,1/BG |
| L6913-2 | 制造商:Thomas & Betts 功能描述:1/2 CORD GRIP CONNECTOR,2/BG |
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