參數(shù)資料
型號： PM6670TR
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： PM6670TR
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
相關(guān)PDF資料
PDF描述
PM6670ATR 1.4 A SWITCHING CONTROLLER, QCC24
PM6670 1.4 A SWITCHING CONTROLLER, QCC24
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PM6675ATR SWITCHING CONTROLLER, QCC24
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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(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(fēng)格: 封裝 / 箱體:CPAK
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
PM6675S 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(fēng)格: 封裝 / 箱體:CPAK
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