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參數(shù)資料
| 型號(hào)： | L6728 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | Single phase PWM controller with PowerGOOD |
| 中文描述： | 單相PWM控制器與電源良好 |
| 文件頁數(shù)： | 14/32頁 |
| 文件大小： | 942K |
| 代理商： | L6728 |
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Output voltage setting and protections
L6728
14/32
9
Output voltage setting and protections
L6728 is capable to precisely regulate an output voltage as low as 0.8V. In fact, the device
comes with a fixed 0.8V internal reference that guarantee the output regulated voltage to be
within ±0.8% tolerance over line and temperature variations (excluding output resistor
divider tolerance, when present).
Output voltage higher than 0.8V can be easily achieved by adding a resistor R
OS
between
FB pin and ground. Referring to
Figure 1
, the steady state DC output voltage will be:
where V
REF
is 0.8V.
L6728 monitors the voltage at VSEN pin and compares it to internal reference voltage in
order to provide Under Voltage and Over Voltage protections as well as PGOOD signal.
According to the level of VSEN, different actions are performed from the controller:
PGOOD
If the voltage monitored through VSEN exits from the PGOOD window limits, the device
de-asserts the PGOOD signal still continuing switching and regulating. PGOOD is
asserted at the end of the soft-start phase.
Under Voltage Protection
If the voltage at VSEN pin drops below UV threshold, the device turns off both HS and
LS MOSFETs, latching the condition. Cycle VCC to recover.
Over Voltage Protection
If the voltage at VSEN pin rises over OV threshold (1V typ), over voltage protection
turns off HS MOSFET and turns on LS MOSFET. The LS MOSFET will be turned off as
soon as VSEN goes below Vref/2 (0.4V). The condition is latched, cycle VCC to
recover. Notice that, even if the device is latched, the device still controls the LS
MOSFET and can switch it on whenever VSEN rises above 0.4V.
Feedback Disconnection Protection
In order to provide load protection even if VSEN pin is not connected, a 100nA bias
current is always sourced from this pin. If VSEN pin is not connected, this current will
permanently pull it up causing the device to detect an OV: thus LS will be latched on
preventing output voltage from rising out of control.
●
●
●
●
V
OUT
V
REF
1
R
R
OS
----------
+
=
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| L6728TR | Single phase PWM controller with PowerGOOD |
| L6731B | Transistor; Type: Amplifiers/Bipolar; VCEO (V): 25; Ic (A): 1; Pc (W): 0.8; hFE: 85 to 330; VCE (sat) (V) max: 0.5; Package: TO-92Mod |
| L6731BTR | Transistor; Type: Amplifiers/Bipolar; VCEO (V): -25; Ic (A): -1; Pc (W): 0.8; hFE: 85 to 330; VCE (sat) (V) max: -0.5; Package: TO-92Mod |
| L6732 | Adjustable step-down controller with synchronous rectification |
| L6732TR | Adjustable step-down controller with synchronous rectification |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| L6728ATR | 功能描述:電壓模式 PWM 控制器 HIGH FREQ SINGLE PHASE PWM CNTRL 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 |
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