參數(shù)資料
型號(hào)： L6910GTR
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, PDSO16
封裝： SO-16
文件頁(yè)數(shù)： 6/26頁(yè)
文件大?。?/td> 1046K
代理商： L6910GTR
L6910G
14/26
Figure 16. Efficiency vs Output Current
6
COMPONENTS SELECTION
6.1 Inductor Selection
To select the right inductor value, the application conditions must be fixed. For example we can consider:
Vin=12V Vout =3.3V Iout=15A
Considering a ripple of approximately 25% to 30% of Iout, the inductor value will be L=3
H.
An iron powder core (TO50-52B) with 7 windings has been chosen.
6.2 Output Capacitors
2 POSCAP capacitors, model 6TPB330M, have been chosen, with a maximum ERS equal to 40m
each.
Therefore, the resultant ESR is of 20m
. Considering a current ripple of 4A, the output voltage ripple is:
Vout = 4 0.02 = 80mV
6.3 Input Capacitors
For IOUT = 15A and D = 0.5 (worst case for input current ripple), the RMS current of the input capacitor is equal
to 7.5A.
Two OSCON electrolytic capacitors 6SP680M, with a maximum ESR equal to 13m
, have been chosen to sus-
tain the ripple. Therefore, the resultant ESR is equal to 13m
/2 = 6.5m. The losses, in worst case, are:
P = ESR I2rms = 366mW
6.4 Over-Current Protection
The current limit can be set to approximately 20A. Substituting the demo board parameters in the relation-
ship reported in the relative section, (IOSCMIN =170A; IP = 20A; RDSONMAX = 9m / 2=4.5m) it results
that ROCS = 510
Output Current (A)
Effic
ie
n
c
y
(%)
50
55
60
65
70
75
80
85
90
95
100
1
3579
11
13
15
17
Vin=Vcc=12V
Fsw.=200KHZ
Vo=1.2V
Vo=1.8V
Vo=3.3V
Vo=5V
Vo=0.9V
Vin=Vcc=12V
Fsw.=200KHZ
Vo=1.2V
Vo=1.8V
Vo=3.3V
Vo=5V
Vo=0.9V
Vo=1.5V
Vo=2.5V
Vo=1.5V
Vo=2.5V
Output Current (A)
相關(guān)PDF資料
PDF描述
L6917BD SWITCHING CONTROLLER, 600 kHz SWITCHING FREQ-MAX, PDSO28
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
L6910R 功能描述:DC/DC 開(kāi)關(guān)控制器 5.0 to 12V Step-Down RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)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
L6910RTR 功能描述:DC/DC 開(kāi)關(guān)控制器 5.0 to 12V Step-Down RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)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
L6910S 功能描述:DC/DC 開(kāi)關(guān)控制器 5.0 to 12V Step-Down RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)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
L6910STR 功能描述:DC/DC 開(kāi)關(guān)控制器 5.0 to 12V Step-Down RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)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
L6910TR 功能描述:DC/DC 開(kāi)關(guān)控制器 5.0 to 12V Step-Down RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)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
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