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參數(shù)資料
| 型號： | L6706 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, QCC40 |
| 封裝： | 6 X 6 MM, ROHS COMPLIANT, VFQFPN-40 |
| 文件頁數(shù)： | 29/47頁 |
| 文件大小： | 623K |
| 代理商： | L6706 |
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L6706
Output voltage monitor and protections
Doc ID 15698 Rev 2
35/47
15.3
Over voltage and programmable OVP
Once VCC crosses the turn-ON threshold and the device is enabled (OUTEN = 1), L6706
provides an over voltage protection: when the voltage sensed by VSEN overcomes the OVP
threshold (OVPTH), the controller:
–
Permanently turns OFF the high-side MOSFETs.
–
Permanently turns ON the low-side MOSFET in order to protect the load.
–
Drives the OSC/ FAULT pin high (3.3 V typ).
–
Power supply or OUTEN pin cycling is required to restart operations.
The OVP threshold can be also programmed through the OVP pin: leaving the pin floating, it
is internally pulled-up and the OVP threshold is set to VID + 175 mV (typ).
Connecting the OVP pin to SGND through a resistor ROVP, the OVP threshold becomes the
voltage present at the pin. Since the OVP pin sources a constant IOVP = 20 A (Min) current
(see Table 5), the programmed voltage becomes:
Filter OVP pin with 100 pF (max) vs. SGND.
Over voltage protections is always active during the soft-start, as shown in the following
picture:
Figure 19.
OVP threshold during soft-start for tracking (left) and fixed (right) mode
15.4
Overcurrent protection
The device limits the peak the inductor current entering in constant current until setting UVP
as below explained.
The over current threshold has to be programmed, by designing the ROCSET resistors as
shown in the Figure 20, to a safe value, in order to be sure that the device doesn't enter
Table 8.
Over voltage protection threshold
OVP pin
Thresholds
OVP threshold
Floating
Tracking
OVPTH = VID + 175 mV (typ)
ROVP to SGND
Fixed
OVPTH = ROVP * 20 μA (min)
OVP
TH
R
OVP
20
μAMIN )
()
=
R
OVP
TH
20
μAMIN )
()
----------------------------------
=
OUTEN
SS_END
VOUT
t
1.240V
t
OVPTH
VID+150mV(MIN)
OUTEN
SS_END
VOUT
t
ROVP * 22uA(MIN)
t
OVPTH
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L6706TR | 功能描述:DC/DC 開關(guān)控制器 VR11.1 SINGLE PHASE CNTRL W/INT DRI 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 |
| L6709 | 功能描述:功率驅(qū)動器IC 6-Bit Dual Ph Contlr RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| L6709TR | 功能描述:功率驅(qū)動器IC 6-Bit Dual Ph Contlr RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| L6710 | 功能描述:功率驅(qū)動器IC 6-Bit Dual Ph Contlr RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| L6710TR | 功能描述:功率驅(qū)動器IC 6-Bit Dual Ph Contlr RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
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