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參數(shù)資料
| 型號： | PM6670STR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 3 A SWITCHING CONTROLLER, QCC24 |
| 封裝： | 4 X 4 MM, LEAD FREE, VFQFPN-24 |
| 文件頁數(shù)： | 22/54頁 |
| 文件大?。?/td> | 742K |
| 代理商： | PM6670STR |
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PM6670S
Device description
Doc ID 14432 Rev 4
29/54
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
PM6670S implements an additional feature to maintain a minimum switching frequency of
33 kHz despite a slight efficiency loss. At very light load conditions, if any switching cycle
has taken place within 30
μs (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.
Inductor current and output voltage at light load with non-audible pulse-skip
For frequencies higher than 33 kHz (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 | 3 A SWITCHING CONTROLLER, QCC24 |
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| PM6675ASTR | 3 A SWITCHING CONTROLLER, QCC24 |
相關(guān)代理商/技術(shù)參數(shù) |
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| PM6670TR | 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(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| 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 |
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| PM6675ASTR | 功能描述:低壓差控制器 - LDO Complete DDR2/3 Mem Pwr supply controllr RoHS:否 制造商:Micrel 最大輸入電壓:5.5 V 輸出電壓:Adjustable 輸出電流:10 mA 負(fù)載調(diào)節(jié): 輸出類型:Adjustable, Fixed 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-6 |
| PM6675ATR | 功能描述:低壓差控制器 - LDO High eff SD CNRL RoHS:否 制造商:Micrel 最大輸入電壓:5.5 V 輸出電壓:Adjustable 輸出電流:10 mA 負(fù)載調(diào)節(jié): 輸出類型:Adjustable, Fixed 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-6 |
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