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參數(shù)資料
| 型號： | L6717 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | DUAL SWITCHING CONTROLLER, 575 kHz SWITCHING FREQ-MAX, QCC48 |
| 封裝： | 7 X 7 MM, 1 MM HEIGHT, ROHS COMPLIANT, VFQFPN-48 |
| 文件頁數(shù)： | 39/56頁 |
| 文件大小： | 1081K |
| 代理商： | L6717 |
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Output voltage monitoring and protections
L6717
44/56
Doc ID 17326 Rev 1
scale can be implemented. When the voltage present at the ILIM pin crosses
VOC_TOT, the device detects an OC and immediately latches with all the MOSFETs
of all the sections OFF (HiZ).
Typical design considers the intervention of the total current OC before the per-phase OC,
leaving this last one as an extreme-protection in case of hardware failures in the external
components. Typical design flow is the following:
–
Define the maximum total output current (IOC_TOT) according to system
requirements
–
Design per-phase OC and RG resistor in order to have IINFOx = IOC_TH (35 μA)
when IOUT is about 10% higher than the IOC_TOT current. It results:
where N is the number of phases and DCR the DC resistance of the inductors. RG
should be designed in worst-case conditions.
–
Design the total current OC and RILIM in order to have the ILIM pin voltage to
VOC_TOT at the desired maximum current IOC_TOT. It results:
where VOC_TOT is typically 2.5V and IOC_TOT is the total current OC threshold
desired.
–
Adjust the defined values according to bench-test of the application.
–
An additional capacitor in parallel to RILIM can be considered to add a delay in the
protection intervention.
Note:
What previously listed is the typical design flow. Custom design and specifications may
require different settings and ratios between the per-phase OC threshold and the Total
Current OC threshold. Applications with huge ripple across inductors may be required to set
per-phase OC to values different than 110%: design flow should be modified accordingly.
Note:
DRP_ADJ command from power manager I2C does not alter the current information used
for per-phase OC and total current OC.
R
G
1.1 I
OC_TOT
() DCR
NI
OCTH
--------------------------------------------------------
=
R
ILIM
V
OC_TOT
R
G
I
OC_TOT
DCR
---------------------------------------
=
I
LIM
DCR
R
G
------------- I
OUT
=
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L6717A | 制造商:STMicroelectronics 功能描述:CPU Power Supply Controller Tray 制造商:STMicroelectronics 功能描述:HANDHELD & COMPUTER PM - Trays 制造商:STMicroelectronics 功能描述:High EFF Hybrid CTRL I2C Embedded Driver |
| L6717ATR | 制造商:STMicroelectronics 功能描述:CPU Power Supply Controller T/R 制造商:STMicroelectronics 功能描述:HANDHELD & COMPUTER PM - Tape and Reel 制造商:STMicroelectronics 功能描述:High EFF Hybrid CTRL I2C Embedded Driver |
| L6717TR | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 High-Efficienc AM2r2 Hybrid Controller RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| L6718TR | 功能描述:其他電源管理 Multiphase Dual PWM VR12 25MHz LTB RoHS:否 制造商:Texas Instruments 輸出電壓范圍: 輸出電流:4 mA 輸入電壓范圍:3 V to 3.6 V 輸入電流: 功率耗散: 工作溫度范圍:- 40 C to + 110 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-48 封裝:Reel |
| L6720 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
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