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參數(shù)資料
| 型號： | PM6675STR |
| 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)： | 15/53頁 |
| 文件大?。?/td> | 2632K |
| 代理商： | PM6675STR |
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Device description
PM6675S
22/53
Figure 33.
Switching frequency selection and VOSC pin
The voltage seen at this pin must be greater than 0.8 V and lower than 2 V in order to
ensure the system linearity.
7.1.1
Constant-On-Time architecture
shows the simplified block diagram of the Constant-On-Time controller.
The switching regulator of the PM6675S controls a one-shot generator that turns on the
high-side MOSFET when the following conditions are simultaneously satisfied: the PWM
comparator is high (i.e. output voltage is lower than Vr = 0.6 V), the synchronous rectifier
current is below the current limit threshold and the minimum off-time has expired.
A minimum Off-Time contraint (300ns typ.) is introduced to assure the boot capacitor charge
and allow inductor valley current sensing on low-side MOSFET. A minimum On-Time is also
introduced to assure the start-up switching sequence.
Once the On-Time has timed out, the high side switch is turned off, while the synchronous
rectifier is ignited according to the anti-cross conduction management circuitry.
When the output voltage reaches the valley limit (determined by internal reference
Vr = 0.6 V), the low-side MOSFET is turned off according to the anti-cross conduction logic
once again, and a new cycle begins.
PM6675
VOSC
R1
R2
VIN
PM6675
VOSC
R1
R2
VIN
PM6675S
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| PM6675TR | 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 負載調節(jié): 輸出類型:Adjustable, Fixed 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SOT-23-6 |
| PM6680 | 功能描述:DC/DC 開關控制器 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 |
| 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 開關控制器 Dual sync controller 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 |
| PM6680ATR | 功能描述:DC/DC 開關控制器 Dual sync controller 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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