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參數(shù)資料
| 型號： | PM6670 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.4 A SWITCHING CONTROLLER, QCC24 |
| 封裝： | 4 X 4 MM, LEAD FREE, VFQFN-24 |
| 文件頁數(shù)： | 29/53頁 |
| 文件大?。?/td> | 799K |
| 代理商： | PM6670 |
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Product(s)
PM6670
Device description
35/53
7.1.11
Over Voltage and Under Voltage Protections
When the switching output voltage is about 115% of its nominal value, a latched Over-
Voltage Protection (OVP) occurs. In this case the synchronous rectifier immediately turns on
while the high-side MOSFET turns OFF. The output capacitor is rapidly discharged and the
load is preserved from being damaged. The OVP is also active during the soft start. Once
an OVP has occured, a toggle on S5 pin or a Power-On-Reset is necessary to exit from the
latched state.
When the switching output voltage is below 70% of its nominal value, a latched Under-
Voltage Protection occurs. This event causes the switching section to be immediately
disabled and both switches to be opened. The controller enters in Soft-End mode and the
output is eventually kept to ground, turning the low side MOSFET on when the voltage is
lower than 400mV. If S3 and S5 are forced low, the low-side MOSFET is released and only
the 22
switch is active.
The Under-Voltage Protection circuit is enabled only at the end of the soft-start. Once an
UVP has toccured, a toggle on S5 pin or a Power-On-Reset is necessary to clear the fault
state and restart the device.
7.1.12
Device thermal protection
The internal control circuitry of the PM6670 self-monitors the junction temperature and turns
all outputs off when the 150°C limit has been overrun. This event causes the switching
section to be immediately disabled and both switches to be opened. The controller enters in
Soft-End Mode and the output is eventually kept to ground, turning the low side MOSFET on
when the voltage is lower than 400mV. If S3 and S5 are forced low, the low-side switch is
released and only the 22
discharge MOSFET is active.
The thermal fault is a latched protection and normal operating condition is restored by a
Power-On Reset or toggling S5.
Table 10. OV, UV and OT faults management
Fault
Conditions
Action
VDDQ over voltage
VDDQ > 115% of the
nominal value
LGATE pin is forced high and the device latches off.
Exit by a Power-On Reset or toggling S5
VDDQ under voltage
VDDQ < 70% of the
nominal value
LGATE pin is forced high after the Soft-End, then the
device latches off. Exit by a Power-On Reset or
toggling S5.
Junction over
temperature
TJ > +150°C
LGATE pin is forced high after the Soft-End, then the
device latches off. Exit by a Power-On Reset or
toggling S5 after 15°C temperature drop.
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| PM6670AS | 功能描述:DC/DC 開關(guān)控制器 DDR 2/3 Memory Pwr Cntrl 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 安裝風格: 封裝 / 箱體:CPAK |
| PM6670ASTR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 Complete DDR2/3 Mem Pwr supply controllr 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: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| PM6670ATR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 Complete DDR2/3 Mem Pwr supply controllr 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: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| PM6670S | 功能描述:DC/DC 開關(guān)控制器 DDR 2/3 Memory Pwr Cntrl 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 安裝風格: 封裝 / 箱體:CPAK |
| PM6670STR | 功能描述:DC/DC 開關(guān)控制器 Complete DDR2/3 Mem Pwr supply controllr 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 安裝風格: 封裝 / 箱體:CPAK |
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