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參數(shù)資料
| 型號： | PM6670ATR |
| 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)： | 21/55頁 |
| 文件大?。?/td> | 849K |
| 代理商： | PM6670ATR |
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Device description
PM6670
28/53
No-Audible Pulse-Skip Mode
Some audio-noise sensitive applications cannot accept the switching frequency to enter the
audible range as is possible in Pulse-Skip mode with very light loads. For this reason, the
PM6670 implements an additional feature to maintain a minimum switching frequency of
33kHz despite a slight efficiency loss. At very light load conditions, if any switching cycle has
taken place within 30
s (typ.) since the last one (because the output voltage is still higher
than the reference), a No-Audible Pulse-Skip cycle begins. The low-side MOSFET is turned
on and the output is driven to fall until the reference has been crossed. Then, the high-side
switch is turned on for a TON period and, once it has expired, the synchronous rectifier is
enabled until the inductor current reaches the zero-crossing threshold (see Figure 34).
Figure 34.
Inductor current and output voltage at light load with non-audible pulse-skip
For frequencies higher than 33kHz (due to heavier loads) the device works in the same way
as in Pulse-Skip mode. It is important to notice that in both Pulse-Skip and No-Audible
Pulse-Skip modes the switching frequency changes not only with the load but also with the
input voltage.
VDDQ
Output
Inductor
current
Vreg
t
TMAX
TON TOFF
TIDLE
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| PM6670S | 功能描述:DC/DC 開關控制器 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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| PM6675 | 制造商:STMicroelectronics 功能描述: 制造商:STMicroelectronics 功能描述:LDO CNTRLR STDN 0.6V TO 3.3V/1.5V 24PIN VFQFPN - Rail/Tube |
| PM6675AS | 功能描述:DC/DC 開關控制器 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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