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參數(shù)資料
| 型號(hào)： | L6911C |
| 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)： | 8/20頁 |
| 文件大小： | 370K |
| 代理商： | L6911C |
Obsolete
Product(s)
- Obsolete
Product(s)
L6911C
16/20
Inductor selection
Since the maximum output current is equal to 14A, to have a 30% ripple (4A) in worst case a 3
H inductor has
been chosen. So the ripple is 4.1A @ 3.5V with VIN=12V and 1.7A @ 3.5V with VIN = 5V.
In worst case the peak is equal to 18.1A.
Output Capacitor
In the demo ten Sanyo capacitors, model 6MV1000GX are used, with a maximum ESR equal to 69m
. There-
fore, the resultant ESR is 69m
/10 = 1.9m. For a load transient of 14A in worst case the drop results:
Vout = 14 * 0.00069 = 96.6mV
The voltage drop due to the capacitor discharge during load transient, considering that the maximum duty cycle
is equal to 100% results in 13mV with 2.5V of programmed output.
Input Capacitor
For IOUT = 14A and D = 0.5 (worst case for input ripple current), Irms is equal to 7A. Five Sanyo electrolytic
capacitors 25MV330GX, with a maximum ESR equal to 69m
, are chosen to sustain the ripple. Therefore, the
resultant ESR is equal to 69m
/5 = 13.8m. So the losses in worst case are:
Over-Current Protection
Substituting the demo board parameters in the relationship reported in the relative section, (IOCSMIN = 170A;
IP = 19A; RDSONMAX = 9m) it results that ROCS = 1k.
Part List
R2
499k
1%
SMD 0805
R3, R7
1k
1%
SMD 0805
R4
20
SMD 0805
R5, R8
20k
SMD 0805
R9
15k
SMD 0805
R12
1K
SMD 0805
R13, R14
0
SMD 0805
C1, C2…C5
330
SANYO – 25MV330GX
Radial 8x20mm
C6, C7…C15
1000
SANYO – 6MV1000GX
Radial 8x20mm
C16, C17, C24, C25
100n
Ceramic
SMD 0805
C18
2.2n
Ceramic
SMD 0805
C19
8.2n
Ceramic
SMD 0805
C20
82n
Ceramic
SMD 0805
C21, C22
1
Ceramic
SMD 1206
C23
1n
Ceramic
SMD 0805
L1
1.5
T44-52 Core, 7T-18AWG
L2
3
T50-52B Core, 10T-16AWG
U1
L6911C
STMicroelectronics
SO20
Q1, Q2…Q6
STS12NF30L
STMicroelectronics
SO8
D1
1N4148
STMicroelectronics
SOT23
D2
STPS3L25U
STMicroelectronics
SMB
F1
251015A-15°
Littlefuse
AXIAL
P
ESR I
rm s
2
670 mW
==
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L6911CTR | 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 |
| L6911D | 功能描述:DC/DC 開關(guān)控制器 5-Bit Prog Step-Down 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 |
| L6911DTR | 功能描述:DC/DC 開關(guān)控制器 5-Bit Prog Step-Down 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 |
| L6911E | 功能描述:DC/DC 開關(guān)控制器 5-Bit Prog Step-Down 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 |
| 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 |
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