參數(shù)資料
型號(hào)： L6722
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 300 kHz SWITCHING FREQ-MAX, QCC36
封裝： 6 X 6 MM, 1 MM PITCH, VFQFPN-36
文件頁(yè)數(shù)： 15/34頁(yè)
文件大小： 421K
代理商： L6722
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9 Output voltage monitor and protections
L6722
22/34
9
Output voltage monitor and protections
L6722 monitors through pin VSEN the regulated voltage and compares this voltage with the
one present at the REF_IN pin to manage the OVP, UVP and PGOOD conditions. Protections
are active also during soft-start (See Section 8 for details).
9.1
Under voltage
If the output voltage monitored by VSEN drops more than -300mV below the programmed
reference for more than one clock period, the device turns off all mosfets and latches the
condition: to recover it is required to cycle Vcc or the INH pin.
UVP is active when the device is enabled, after the reference reaches 0.6V.
9.2
Over voltage
When the voltage sensed by VSEN overcomes the OVP threshold, the controller permanently
switches on all the low-side mosfets and switches off all the high-side mosfets in order to
protect the load. The FLT pin is driven high (5V) and power supply or INH pin cycling is required
to restart operations.
OVP is active as soon as the device is enabled.
9.3
Preliminary over voltage
To provide a protection while VCC is below the UVLOVCC threshold and when the device is
disabled is fundamental to avoid damage to the load in case of failed HS mosfets. In fact, since
the device is supplied from the 12V bus, it is basically “blind” for any voltage below the turn-on
threshold (UVLOVCC). In order to give full protection to the load, a Preliminary-OVP protection
is provided while VCC is within UVLOVCC and UVLOOVP.
This protection turns-on the low side mosfets as long as the FBR pin voltage is greater than
1.25V with a 300mV hysteresis. When set, the protection drives the LS mosfet with a gate-to-
source voltage depending on the voltage applied to VCC. This protection depends also on the
INH pin status as detailed in Figure 12.
A simple way to provide protection to the output in all conditions when the device is OFF (then
avoiding the unprotected red region in Figure 12-Left) consists in supplying the controller
through the 5VSB bus as shown in Figure 12-Right: 5VSB is always present before +12V and,
in case of HS short, the LS mosfet is driven with 5V assuring a reliable protection of the load.
Pre-OVP is active when the device is disabled and when UVLOOVP < VCC < UVLOVCC.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
L6722TR 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 3 Phase Controller RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
L6725 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 Vltg Mode PWM Controller RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
L6725_07 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Voltage mode PWM controller with bootstrap anti-discharging system
L6725A 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 Vltg Mode PWM Controller RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
L6725ATR 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 Step-Down Controller RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
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