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參數(shù)資料
| 型號(hào)： | PM6641 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, 1100 kHz SWITCHING FREQ-MAX, QCC48 |
| 封裝： | 7 X 7 MM, 1 MM HEIGHT, LEAD FREE, VQFP-48 |
| 文件頁數(shù)： | 27/47頁 |
| 文件大?。?/td> | 2254K |
| 代理商： | PM6641 |
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PM6641
Device description
Doc ID 13510 Rev 3
33/47
7.11
Fault management
PM6641 has been conceived to constantly monitor the rails output voltage. In order to
protect itself from failure and the load from damage, the device is able to:
●
Limit the power MOSFETs current
●
Detect output overvoltage
●
Detect output under voltage
●
Monitor the device temperature
●
Detect input power supply under voltage
The current limit is an auto-recovery protection, monitoring cycle by cycle the regulators
high side MOSFET current (see Chapter 7.10: Peak current limit on page 31 section for
details).
The output over voltage and under voltage and the input under voltage are latched
protections, whereas the thermal shutdown is auto-recovery; all these features are
described in the following sections.
7.11.1
Output overvoltage
If the output voltage of a switching regulator (memory supply rail VDDQ (1.8 V), chipset
supply rails 1.5 V or 1.05 V) becomes greater than 120% of its nominal value, an over
voltage (OV) protection for that rail is triggered. As a consequence the regulator stops
switching, the internal low-side power MOSFET of that rail is turned on and the high-side
MOSFET is turned off. The OV protection effect is the very quick discharge of the rail output
capacitor.
The OV condition is latched, and it can be reset only by toggling the enable pin of that rail or
by turning off and on the IC power supply (AVCC pin).
An OV condition for one of the outputs of the PM6641 has no effect on the operation of the
other outputs (e.g., if the OV protection is triggered for the VDDQ regulator, the 1.5 V and
1.05 V regulators continue to work normally).
7.11.2
Output under voltage
If the output voltage of a switching regulator (memory supply rail VDDQ (1.8 V), chipset
supply rails 1.5 V or 1.05 V) becomes lower than 60% of its nominal value (e.g. because the
rail was shorted to ground or the output load is increased dramatically), an under voltage
(UV) protection for that rail is triggered.
An UV condition causes the soft-end of the rail, which implies the regulator turn off and the
rail discharge MOSFET turn on (see Chapter 7.7: Outputs soft-end on page 29 section for
details); the UV condition is latched, and it can be reset only by toggling the enable pin of
that rail or by turning off and on the PM6641 power supply (AVCC pin).
As for OV protection, each switching regulator can perform under voltage protection without
affecting other regulators.
The over-current feature is implemented in the PM6641 by limiting the output current of
each rail (see Chapter 7.10: Peak current limit on page 31 section for details) and triggering
a latched UV protection if the output voltage falls because of a load requesting more current
than the limit.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| PM6670ASTR | 3 A SWITCHING CONTROLLER, QCC24 |
| PM6670AS | 3 A SWITCHING CONTROLLER, QCC24 |
| PM6670A | 1.4 A SWITCHING CONTROLLER, QCC24 |
| PM6670STR | 3 A SWITCHING CONTROLLER, QCC24 |
| PM6670S | 3 A SWITCHING CONTROLLER, QCC24 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PM6641TR | 功能描述:低壓差穩(wěn)壓器 - LDO Monolithic VR RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| PM6644 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 350mA adjust SD reg 4.5V to 25V 350mA RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| PM6644TR | 功能描述:DC/DC 開關(guān)控制器 350 mA adj step-down 4.5 to 25V -40, 150c 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 |
| PM6650 | 制造商:Qualcomm 功能描述:Electronic Component |
| PM6652 | 功能描述:DC/DC 開關(guān)控制器 Single Phase CNTR Intel MVP 6.5 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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