參數(shù)資料
型號： L6728H
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 330 kHz SWITCHING FREQ-MAX, PDSO10
封裝： 3 X 3 MM, ROHS COMPLIANT, DFN-10
文件頁數(shù)： 6/32頁
文件大?。?/td> 1213K
代理商： L6728H
Obsolete
Product(s)
- Obsolete
Product(s)
Output voltage setting and protections
L6728H
14/32
Doc ID 15725 Rev 1
9
Output voltage setting and protections
L6728H is capable to precisely regulate an output voltage as low as 0.8 V. In fact, the device
comes with a fixed 0.8 V 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 0.8 V can be easily achieved by adding a resistor ROS between
FB pin and ground. Referring to Figure 1, the steady state DC output voltage will be:
where VREF is 0.8 V.
L6728H 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 (1 V 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 (0.4 V). 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 OV threshold.
●
Feedback disconnection protection
In order to provide load protection even if VSEN pin is not connected, a 100 nA 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
FB
R
OS
-----------
+
=
相關(guān)PDF資料
PDF描述
L6728 1.5 A SWITCHING CONTROLLER, 330 kHz SWITCHING FREQ-MAX, DSO10
L6728TR 1.5 A SWITCHING CONTROLLER, 330 kHz SWITCHING FREQ-MAX, DSO10
L6731BTR 20 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16
L6731B 20 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16
L6731D 20 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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
L6730_09 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Adjustable step-down controller with synchronous rectification
L6730B 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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