參數(shù)資料
型號： L6728D
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： 30 A SWITCHING CONTROLLER, 300 kHz SWITCHING FREQ-MAX, PDSO10
封裝： 3 X 3 MM, ROHS COMPLIANT, DFN-10
文件頁數(shù)： 7/33頁
文件大?。?/td> 1215K
代理商： L6728D
L6728D
Output voltage setting and protections
Doc ID 16498 Rev 1
15/33
9
Output voltage setting and protections
The L6728D is capable of precisely regulating an output voltage as low as 0.8 V. In fact, the
device is equipped with a fixed 0.8 V internal reference that guarantees the output regulated
voltage remains within a ±0.8% tolerance over line and temperature variations (excluding
output resistor divider tolerance, when present).
Output voltages higher than 0.8 V can be easily achieved by adding a resistor ROS between
the FB pin and ground. Referring to Figure 1, the steady-state DC output voltage is:
where VREF is 0.8 V.
The L6728D monitors the voltage at the VSEN pin and compares it to the internal reference
voltage in order to provide undervoltage and overvoltage protection as well as a PGOOD
signal. Depending on the level of VSEN, different actions are performed by the controller:
●
PGOOD: If the voltage monitored through VSEN goes outside the PGOOD window
limits, the device de-asserts the PGOOD signal while still continuing to switch and
regulate. PGOOD is asserted at the end of the soft-start phase.
●
Undervoltage protection: If the voltage at VSEN pin drops below the UV threshold,
the device turns off both the HS and LS MOSFETs, latching the condition. Cycle the
VCC to recover.
●
Overvoltage protection: If the voltage at VSEN pin rises over OV threshold (1 V typ),
overvoltage protection turns off the HS MOSFET and turns on the LS MOSFET. The LS
MOSFET is turned off as soon as VSEN goes below Vref/2 (0.4 V). The condition is
latched. Cycle the VCC to recover. Note that even if the device is latched, the device
still controls the LS MOSFET and can switch it on whenever VSEN rises above the OV
threshold.
●
Feedback disconnection protection: In order to provide load protection even if the
VSEN pin is not connected, a 100 nA bias current is always sourced from this pin. If
VSEN pin is not connected, this current permanently pulls it up, causing the device to
detect an OV. Thus, LS is latched on, preventing the output voltage from rising out of
control.
V
OUT
V
REF
1
R
FB
R
OS
-----------
+
=
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
L6728DTR 功能描述:電流型 PWM 控制器 Single-Phase PWM 5V to 12V Controller RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 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
L6728H 功能描述:電壓模式 PWM 控制器 Sgl Output 300 KHz DFN-10 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
L6728HTR 功能描述:電流型 PWM 控制器 SINGLE PHASE PWM CNTRL PWR GOOD RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 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
L6728TR 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
L6730 功能描述:DC/DC 開關(guān)控制器 Adjustable Step Down 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
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