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參數(shù)資料
| 型號： | L6716 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | DUAL SWITCHING CONTROLLER, 225 kHz SWITCHING FREQ-MAX, QCC48 |
| 封裝： | 7 X 7 MM, 1 MM HEIGHT, ROHS COMPLIANT, VFQFP-48 |
| 文件頁數(shù)： | 36/57頁 |
| 文件大?。?/td> | 829K |
| 代理商： | L6716 |
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L6716
Output voltage monitor and protections
Doc ID 14521 Rev 3
41/57
18.4
Overcurrent protection
The device limits the peak the inductor current entering in constant current until setting UVP
as below explained.
The overcurrent threshold has to be programmed, by designing the ROCSET resistors as
shown in the Figure 25, to a safe value, in order to be sure that the device doesn't enter
OCP during normal operation of the device. This value must take into consideration also the
transitions” Section for details):
The device detects an overcurrent when the IINFOx overcome the threshold IOCTH externally
programmable through OCSET pin.
where
ΔIL is the inductor ripple current (peak-to-peak).
Since the device always senses the current across the inductor, the IOCTH crossing will
happen during the HS conduction time: as a consequence of OCP detection, the device will
turn OFF the HS MOSFET and turns ON the LSMOSFET of that phase until IINFOx re-cross
the threshold or until the next clock cycle. This implies that the device limits the peak of the
inductor current.
In any case, the inductor current won't overcome the IOCPx value and this will represent the
maximum peak value to consider in the OC design.
The device works in constant-current, and the output voltage decreases as the load
increase, until the output voltage reaches the UVP threshold. When this threshold is
crossed, all MOSFETs are turned off and the device stops working. Cycle the power supply
or the OUTEN pin to restart operation.
Figure 25.
Overcurrent protection connection
IOUT
OCP
IOUT
MAX
I
DVID
–
+
>
I
OCTH
V
OCSET
R
OCSET
----------------------
1.240V typ
()
R
OCSET
---------------------------------
==
I
INFOx
OCP
DCR
Rg
-------------
I
OUT
OCP
N
-----------------------
ΔIL
2
---------
+
=
ROCSET
OCSET/PSI_A
VOCSET =1.240V (TYP)
I OCTH
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| L6716TR | 功能描述:開關變換器、穩(wěn)壓器與控制器 2/3/4 phase CNTRL Embedded Drivers 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 |
| L6717 | 制造商:STMicroelectronics 功能描述:High-Efficiency Hybrid AM2r2 Controller 48-Pin VFQFPN 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 |
| 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 |
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