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參數(shù)資料
| 型號： | PM6675TR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, QCC24 |
| 封裝： | 4 X 4 MM, VFQFPN-24 |
| 文件頁數(shù)： | 16/50頁 |
| 文件大?。?/td> | 782K |
| 代理商： | PM6675TR |
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PM6675
Device description
23/47
No-Audible Pulse-Skip Mode
Some audio-noise sensitive applications cannot accept the switching frequency to enter the
audible range as it is possible in Pulse-Skip mode with very light loads. For this reason, the
PM6675 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 of 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 point 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 10).
Figure 10.
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.
Output
voltage
Inductor
current
Vreg
t
TMAX
TON TOFF
TIDLE
相關(guān)PDF資料 |
PDF描述 |
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| PM6675 | SWITCHING CONTROLLER, QCC24 |
| PM6680ATR | 0.4 A DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, QCC32 |
| PM6680A | 0.4 A DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, QCC32 |
| PM6680TR | 0.4 A DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, QCC32 |
| PM6685TR | DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, QCC32 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PM6680 | 功能描述:DC/DC 開關(guān)控制器 No Rsense dual StepDwn 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 |
| PM6680_08 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:No Rsense dual step-down controller with adjustable voltages for notebook system power |
| PM6680A | 功能描述:DC/DC 開關(guān)控制器 Dual sync 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 |
| PM6680ATR | 功能描述:DC/DC 開關(guān)控制器 Dual sync 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 |
| PM6680TR | 功能描述:DC/DC 開關(guān)控制器 No Rsense dual StepDwn 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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