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參數(shù)資料
| 型號(hào)： | L6727TR |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | Single phase PWM controller |
| 中文描述： | 單相PWM控制器 |
| 文件頁數(shù)： | 14/22頁 |
| 文件大?。?/td> | 318K |
| 代理商： | L6727TR |
Output voltage monitor and protections
L6727
14/22
8
Output voltage monitor and protections
L6727 monitors the voltage at FB pin and compares it to internal reference voltage in order
to provide Under Voltage and Over Voltage protections.
8.1
Under voltage protection
If the voltage at FB pin drops below UV threshold (0.6V typ), the device turns off both HS
and LS MOSFETs, waits for 2048 clock cycles and then performs a new Soft Start. If under
voltage condition is not removed, the device enters a hiccup mode with a typical period of
13.6ms.
UVP is active from the end of soft start.
8.2
Over voltage protection
If the voltage at FB pin rises over OV threshold (1V typ), over voltage protection turns off HS
MOSFET and turns on LS MOSFET overriding PWM logic as long as over voltage is
detected.
OVP is always active with top priority as soon as over current threshold setting phase has
been completed.
8.3
Feedback disconnection protection
In order to provide load protection even if FB pin is not connected, a 100nA bias current is
always sourced from this pin. If FB pin is not connected, this current will permanently pull up
FB over OVP threshold: thus LS will be latched on preventing output voltage from rising out
of control.
8.4
Under voltage lock out
In order to avoid anomalous behaviors of the device when the supply voltage is too low to
support its internal rails, UVLO is provided: the device will start up when VCC reaches
UVLO upper threshold and will shutdown when VCC drops below UVLO lower threshold.
The 4.1V maximum UVLO upper threshold allows L6727 to be supplied from 5V and 12V
busses in or-ing diode configuration.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L6728 | 功能描述:DC/DC 開關(guān)控制器 Sngl phase PWM 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 |
| L6728_0706 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Single phase PWM controller with Power Good |
| L6728A | 功能描述:電壓模式 PWM 控制器 Hi-Freq. singl-phase PWM controller w/Po RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| L6728AH | 功能描述:軟開關(guān) PWM 控制器 Sgl Output 600 KHz DFPN-10 RoHS:否 制造商:Fairchild Semiconductor 輸出端數(shù)量: 輸出電流: 開關(guān)頻率: 工作電源電壓:30 V 電源電流: 最大工作溫度:+ 105 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
| L6728AHTR | 功能描述:電流型 PWM 控制器 HIGH FREQ PWM CNTRL W/PO RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
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